peterthefish
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Posts posted by peterthefish
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and
fire out of battery can cause blowout.
a 45 is a relatively low pressure round so I think setback is not the issue directly.
If that round was a little long it may have held the case back out of the chamber... a little.
and so the case held the breach open just a little...
that "a little" is the blowout.
I would shim the breach open a little and see how open you can get it and still have it fire.
(dry fire!!!)
that is my guess.
miranda
Easier said then done (and no doubt the reason for much of the OOB firing speculation on the internet).
Let's say you shim the breach open and push the slide far enough forward to have the trigger click. What have you actually proved? Probably nothing...
1) you don't know if the firing pin was caught by the FPB or not.
2) even if it is not, if the slide is not fully in battery the striker is not fully cocked. And you have to back the slide up a bit to get the barrel / slide to unlock. Probably enough that you wouldn't set off a primer, even if the FPB didn't catch the striker.
Try to prove OOB firing with an empty primed case and then well talk.
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edit, davidson's had them in stock this week, as peter points out they most likely all went out to dealers, so I suspect more will start showing up on GB...maybe.
I am hoping this is the case. I've got a deposit on a 627 VComp - hoping these come in first.
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May I make a modest proposal? A new division along these lines. Let's call it the Harrison Bergeron class. Players will be allowed enhancements or required to use handicaps as necessary so all shooters are on a level playing field.
Those who are young and fit will be required to wear lead vests and ankle weights so they are no faster or more nimble than the slowest shooter at the match.
Those with poor eyesight will be allowed to use red dots, while those with 20/15 vision will be required to use GI style sights.
Those with strong arms will be required to shoot 'Super Major' PF ammo with no scoring benefit, and those with outstanding dexterity will be capped at 5 rounds / mag, while the recoil shy will be allowed to shoot 'Sub-Minor' with no penalty and those slow to reload will have no capacity restrictions.
I know what you're thinking; it will be tough to implement, and I agree. But we'll know we have it right when everyone's classification is the same and winning or losing comes down to sheer chance instead of one player's unfair advantage over another's, whether that advantage is gained through biological good fortune, age, or practice (which really just reflects how much free time someone has and unfairly discriminates against those with kids, two jobs, or other time commitments).
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Quickload is notoriously inaccurate with high charges in straight (or nearly straight) cases. VVs max 3N38 / 147 Grain 9mm load shows crazy high pressures in QL but is within SAAMI standard.
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Not to get too grammar crazy here, but the rule says "the backstop", not "a backstop". The word "the" is a definite article.
The definite article the is the most frequent word in English.
We use the definite article in front of a noun when we believe the hearer/reader knows exactly what we are referring to; in this case because there is only one.
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Did you loctite in the sprain screw last time you assembled the gun? If not, it likely backed gradually out over the course of the last year causing an increasingly lighter pull that you noticed on reassembly. It's happened to me before.
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I heard there is some new "restriction" that a cargo ship may only have one konex box of powder on it now. To where before it was multiple.
It's a "conex" box (short for Container Express http://en.wikipedia.org/wiki/Intermodal_container), and as I understand it, it's not rumor at all. It's an Australian restriction on outbound shipments. So US Federal Regulations (49 CFR) aren't applicable in that case.
Ah. Thought it was an import not export issue.
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I heard there is some new "restriction" that a cargo ship may only have one konex box of powder on it now. To where before it was multiple.
As far as I know this is just a rumor. 49 CFR 173 applies to domestic shipments and has not changed recently. Don't see anything out there about imports...
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What type of plated bullets? While you are on the safe side with 4.0, plated should generally be loaded closer to lead than FMJ, and the VV recipe is for FMJs. If the bullet had a longer profile than the projectile in the recipe, you're also reducing case volume and so potentially spiking pressure.
You mention that you checked your charges, but how consistent are your throws? You may notice a double charge but I doubt you would notice an extra .4 of 310 in .45 ACP cases.
CBC is Magtech brass - no issues I've heard of there. And it's the rare piece I 45 brass that had a case head separation before a split mouth. I suppose it's possible the brass is from someone else's very hot reloads, but if it was hot enough to do this the case probably would have had some bulging apparent when you were loading you would have culled it out.
I had a similar event with a AMERC case, but that's known poor quality brass. But in that KB, the blowout followed the barrel feed ramp more closely than yours, which looks somewhat torn.
Over belling the case would be an issue that would manifest as setback. You said this was the first round? Measure a few, chamber, then measure again. Any setback?
If not Id say its a pressure spike, probably caused by a combination of your recipe and maybe heavy throws. Might be worth pulling some and seeing if they're all on the nose weight wise.
Last questions - what are you using for a scale? Can we see a loaded round?
/One more thing. I've double charged 45s before doing lots of 25 in a loading block for load development. I caught those because I was using a bulkier powder and a loading block. But with a single stage / turret / manual index it's ALWAYs a possibility. Heck I double charged a round on my LNL AP once when my wife interrupted me (thank you lockout die). It's not a character flaw. It's a possible mistake - don't take it personally that folks point it out.
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Just got an in stock alert from Davidsons on these. They were out of stock when I checked 5 seconds after getting the email (I'm assuming they were allocated) but hopefully this means another batch will be hitting stores shortly.
I literally clock the link within 3 seconds of it hitting my inbox and they were out of stock.
I'm assuming whatever went into stock was allocated to dealers immediately. Hopefully we'll see them hit the streets in a week or two.
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Just got an in stock alert from Davidsons on these. They were out of stock when I checked 5 seconds after getting the email (I'm assuming they were allocated) but hopefully this means another batch will be hitting stores shortly.
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I just picked up 6 lbs. of 3N38 Lapua data lists 1207 FPS for a 9mm 147gr out of a 4 in barrel! BTW if now ones seen it Lapua has a new load data sight and added more calibers/load data on 7-2-14
I use this load for bowling pins. I don't get 1200 FPS even out of a 5" + Glock 34 barrel (and I worked up this load using XTPs) but it is fun to shoot.
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I get these rings (although a little further down the bullet) when seating w Hornady dies. Basically the bullet or plating is soft enough that the pressure applied by the die to seat the bullet also leaves a ring. I don't get this on FMJs.
I've never had the plating separate as a result, and I'm shooting the 147s sized to .357 in my 627 w 38 Short Colt.
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As a reloader I think it's important to know the difference between power factor and kinetic energy; PF is a simple momentum formula which I believe (someone who knows better please step in) began as a pendulum test with the idea that rounds with the same PF would have the same probability of knocking down the same piece of steel.
I suspect the factors which effect the longevity of a pistol and the impulse of the recoil have more to do with energy. If you play around with this calculator (http://www.tresterscustomguns.com/calcnrg.html) you'll see that holding PF constant, the lighter bullets at higher velocities have drastically more kinetic energy (which makes sense since velocity is squared in the energy formula). This is in keeping with the idea that heavier bullets at the same PF produce a softer recoil.
Look at a 115gr bullet traveling 1450fps and a 230gr bullet traveling 725fps; both have a PF of 166.75, but the 9mm has double the energy of the .45 (536.76 vs 268.38) so without a compensator to dissipate some of that energy, the recoil impulse of the 9mm would be punishing (this is why I always advise against shooting 9 Major without a comp) on the shooter's arms as well as the pistol.
If someone really wanted to shoot 9 Major without a comp they could shoot 160gr pills at 1042fps and cut the energy down to 386.
You are on the right track but a bit off on the reasonably. Then a gun is fired, momentum is conserved. That is, the momentum of the ejecta (Mass X Velocity) = the momentum of the recoiling firearm, regardless of the kinetic energy of the projectile. However, it takes more energy (i.e. More powder) to move the lighter projectile faster (i.e. produce higher K.E.). The gases produced by that additional powder have increased mass over the gas produced by a lighter powder charge. Moreover, those gases are moving faster than the projectile, resulting in greater momentum of the ejecta and thus greater momentum of the recoiling firearm.
Here's an example ; Imagine 5 grains of Powder A Moves a 230 GR projectile at 850 FPS; while 10 Grains of Powder B (a slower powder) does the same. Lets assume that exit gases move at 1500 FPS.
For powder A, recoil momentum = (850 x 230) + (5 x 1500) =203,000. For Powder B, recoil momentum = (850 X 230) + (10 x 1500) = 210,500, which is about a 3.7% increase.
In theory, doubling KE (while maintaining constant momentum / PF) requires doubling input energy - that is, the powder charge. In reality, you have to more then double the charge as higher velocity means more energy lost to heat, sounds, etc...
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Just called them - it's a 986. I have no words...
beat me to it.
I heard a second hand rumor 929's were supposed to start shipping in volume starting this month.
We shall see I guess.
I hope so - was hoping to have one for the big RI Walls of Steel match at the end of August - not looking good right now...
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Just called them - it's a 986. I have no words...
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1715 X 125 is 214 pf
223 55gr x 3000 fps is 165 pf
62 x 3100 192
yeah the load is a little on the hot side
Apples & Oranges.
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I use an RMR. As other have mentioned you lose the dot during recoil as the sight is moving. Another consideration is the smaller glass size of an RMR / Deltapoint vs a C More - can make requiring the dot that much harder.
Plan to move to a CMore after this summer and put the RMR back on the ACOG where it belongs.
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Three (perceived?) factors play into this. As previously mentioned, slower powders require a larger charge for the same velocity. That powder (or more precisely the gases produced by burning it) leave the barrel with the bullet.
In short, if you move the same (say 200 Grain) bullet at the same velocity with a 4GR charge of Bullseye and an 8GR charge of 3N38 (made up #s), the second charge actually has a mass of 208 grains vs. 204 for the first. That's about a 2% increase in momentum.
However, the gases actually are traveling faster than the bullet. So momentum of the ejecta (and in turn the firearm) is likely increased by more like 3-5%. I'd guess this is responsible for most of the increase in felt recoil with slower powders.
Second is the fact that slower powders are more likely to incompletely combust before the bullet leaves the barrel. This means more blast which increases perceived recoil.
Lastly, some argue that the shape of the pressure curve dictates the nature of felt recoil. Fast powders have a higher peak pressure while slower powders will have a lower peak but longer duration with high pressure. The area under both pressure curves should be nearly identical. However, pressure rises and drops so quickly (in handguns by the time the bullet has traveled 2" down the barrel pressure is a fraction of peak) compared to the total duration of the recoil cycle (unlocking after bullet leaves barrel, slide rear, slide forward picking up round, lockup barrel and slide) that I strongly doubt this has ANY appreciable impact in felt recoil over the first two factors noted.
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With a HB bullet profile you may need to load a little shorter to get the expected velocity - the HB essentially increases case volume meaning lower pressure / velocity.
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I also use 100s - the berrys 100 GR HBRN (might be under the .380 section on their site) have a longer profile - I load them to 1.085 and they feed fine in my 34 & 35 conversion. 1250 FPS (I use power Pistol) cycles the 35 conversion with a ported barrel and 13# spring).
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If you can move it so one / both legs are over joists, find some sturdy L brackets and attach one side to leg, the other screw into floor joist. When the screw is removed the carpet pile will likely close up around it.
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Where do you find the zeros and are they affordable? I've held off buying FMJ because Montana golds were so much more than plated or coated.
Roze Distribution. I think I paid $.09 for 147 GR 9mms and .13 for 230 GR JHPs in .45.
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11# is a good starting (and likely ending) point. Glocks are different than 1911 / CZ platforms in that the recoil spring not only brings the slide forward to reload the gun, it has to provide enough tension to keep the striker cocked.
I believe I'm running a 11 lb spring right now on my G34. Would this be a good starting point?I say skip the comp for now, add the dot, use ~3gr of your titegroup under a 115gr and a really light recoil spring. I think you'll like it
Glock 21 brass failure
in Glock
Posted
That's what quotes are for.
I'm not asking for proof, I'm trying to help OP diagnose the problem.
Shim or not you prove nothing. And the SAAMI spec allows 22 'thous' in tolerance in 45 chamber length.
I didn't state a Glock can never fire OOB. I did point out that many people online think the fact that they can get the trigger to click with the slide slightly retracted is enough to prove OOB firing is a possible issue. Never mind that most of those 'experiments' have the slide pulled back so little that the barrel and slide are actually in battery...
I do have a horse in this though. I hate the propagation of misinformation.