Blackstone45
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Posts posted by Blackstone45
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Revisiting this thread because I have some video footage at last!
I've edited in some helpful lines. But as you can see, after the recoil cycle, my gun ends up higher than it started, and I have to bring it back down. This is probably what was happening when I talked about the 'delay' at the peak of recoil. What's the cause of this - not leaning forwards enough?
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1 minute ago, George16 said:
It’s a very nice upgrade. Keeps the dust contained and easier to dispose off the spent primers.
Thanks. You've now got me browsing Armanov upgrade parts (because i'm in Europe), and there's a lot of good stuff there.
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5 minutes ago, George16 said:
I’m talking about this spent primer upgrade.
Ah, that looks like something to add to my shopping list...
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My 750 did come with a spent primer cup.
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I've not been dropping them, just using them to simulate a heavy gun, and practicing inserting them during the reload.
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My understanding of doubles is it helps diagnose whether your grip on autopilot is returning the gun down to the original point of aim, and if you're jerking the second shot.
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Bumping to share some 9mm load data that may be of more interest to European shooters (due to the bullet used)
Powder: Vectan Ba 9 1/2
Primer: Magtech SPP
Case: Mostly CBC (Magtech) with some S&B
OAL: 1.07-1.08" (can't seem to get very consistent OAL)
Bullet: Ares 9mm polymer coated 125gr conical nose (RNCNBB CEPRX)
Data below is preliminary based on only 5 rounds per charge weight.
3.8gr: Average velocity 1026fps, 128 PF
4.0gr: Average velocity 1049fps, 131 PF
4.2gr: Average velocity 1091fps, 136 PF
Based on this, I'm going to go with 4.0gr and will load up a larger batch to run through chrono.
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After using a sharpie to mark the cartridge, I've determined that it's the bulge in the case where the base of the bullet is seated that's causing it to fail the plunk test.
My original loads that worked well use 124gr TMJ round nose Frontier bullets with a .355 diameter. The polymer round nose, and TMJ flat nose bullets that don't pass the plunk test have .356 diameter.
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I tested in my SIG P210 barrel with the same results. Assuming that the P210 has a "normal" leade as compared to CZ barrels, it must be the case bulging around the seated bullet that's causing the issue.
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7 hours ago, AHI said:
3 different bullets. 3 different profiles. 3 different overall lengths.
So what's so hard to understand?
I guess my question is, can it be factors outside of the bullet that affect the plunk test. For example, the bulge in the case after seating the bullet?
5 hours ago, Dwbsig said:Are you doing your test with the barrel in same condition clean-dirty?
Yes, I tested all three rounds at the same time on the same barrel
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This description of the issue is rather long, so please bear with me. My gun is a CZ 75 SP-01 Shadow.
The first rounds I loaded were 124gr copper jacketed round nose 9mm Frontier bullets made, with OAL of around 1.13"; these pass the plunk test perfectly, they drop into the chamber and drop back out without issues. They also spin freely in the chamber. I still have around 60 of these loaded rounds.
I then made the decision to change to 125gr polymer coated round nose bullets made by Ares, also with OAL around 1.13". I loaded a few to chrono, they all cycled fine and velocites were good so I made a larger batch.
At the same time as when I changed to the polymer coated bullets, I also bought some copper jacketed flat nose/truncated cone bullets as I'm a fan of the neater holes they punch. Today, I decided to load a few to check what the optimal OAL is, and check velocities with the same powder charge. At 1.13", it couldn't pass the plunk test. I kept reducing the OAL all the way down to 1.05" with no luck. While the bullets do make a 'plunk' sound, they won't spin in the chamber, and their cartridge rims don't sit flush with the bit of metal near the feed ramp (if that makes sense).
Therefore, I went back to check those polymer bullets I loaded at 1.13", and they also fail the plunk test. But they've been cycling absolutely fine in my gun. So, what do I do here?
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2 hours ago, Hooked said:
The DPM system isn’t legal in IPSC Production.
The current Handgun rulebook permits aftermarket springs. Appendix D4, 18.4
Unless the DPM is still disqualified because the whole guide rod system is also aftermarket
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On 9/6/2020 at 12:35 AM, ohsevenflhx said:
Stock recoil spring is too strong. Get a reduced strength recoil spring or cut a coil off of the stock spring. It's a common issue.
Having trouble finding a reduced strength spring on the internet. All the results I'm getting are for the DPM spring.
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My friend has been having trouble with his Walther Q5. The gun sometimes doesn't fully eject a case, causing a jam. It also often doesn't lock back on the last round. It locks back every time when the slide is racked with an empty magazine.
Based on those two issues, I would say it's caused by the slide not going all the way to the rear during recoil. It's not a problem with ammunition, as it also occurs with full power factory ammo. So could it be an issue with the recoil spring?
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That post was peak boomer
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Thanks for sharing. I ordered a set of three a few weeks ago, but aren't being particularly rough with them yet.
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In my mind, DQs for unsafe gun handling are there for safety reasons, not to catch shooters out. So DQs should only be handed out when the RO is absolutely certain there was a violation.
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I shoot a SP-01 Shadow, currently fitted with a 11lb recoil spring and a stainless steel guiderod, both by Eemanntech. I usually shoot 130PF 9mm homeloads, but occasionally I find a good deal on factory ammo and use it as practice ammo. I chrono'd the factory ammo and it comes out at around 138PF. I'm wondering if it makes any sense to change to a heavier recoil spring for the factory loads? Is the PF difference big enough to justify it?
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2 hours ago, MisterM said:
For sure interchangeable springs: trigger spring and recoil spring. But for sure not: main spring, firing pin spring and extractor spring.
I hope to visit the factory in October (assuming no quarantine restrictions) and will ask the owner.
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@KommBat I'm also interested to know about the recoil spring, what the factory weight is, and if you changed your's? And whether the springs are interchangeable with CZ springs?
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Yep, and it messed me up when I had to shoot a club Glock competition (so Glocks only). On multiple instances ran the gun dry without realising because the slide didn't lock back (thumb was riding the slide release).
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Agreed, it's important to recognise the second sight picture so you can call whether you need a makeup shot, and whether you need to adjust your grip because the gun isn't returning to the original position.
I don't think it's possible, with PF >125 ammo, to get a good Bill Drill time if you're confirming each sight picture before taking the shot.
I've also been playing with relaxing the shooting hand more, and it really has helped cut down on the amount of trigger jerking.
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2 hours ago, IVC said:
not merely squeezing the trigger and counting on your grip to produce the consistent second shot.
My understanding though, is that eventually that is the stage you want to be at? Where you aren't waiting to confirm the sight picture before you squeeze off the next shot? I think this is what you mean by predictive, as opposed to reactive shooting?
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Shot some more doubles on Saturday. I used a bit more forward lean stance-wise, and made a conscious effort to crush more with my support hand and loosen a bit with my dominant hand. Couldn't measure splits because I was on a line with 5 other shooters, but at 10m, I was making consistent A-zone hits with at least 0.30 splits.
Recoil settling question
in Handgun Techniques
Posted
Ok, I'll try that. Should I flare my elbows outwards a bit more too?