cautery

Thanks Steve... I just read through McLearn's site...

Heath - I misread your earlier post... Somehow I read 0.0015 as 0.015". <old eyes> I apologize.

Sandoz - I know he is... That's why I value his opinion, and hope I can enlist his brain (and may be his machining talents?) to make this happen.

benny, OK, you have a ton more experience than I for sure, so I am most definitely NOT arguing with you but I would like to ask fr a clarification. First, "I" am talking about a +/- 0.001" tolerance for the machinist to cut the chamber depth (specifically the depth of cut as measured from the breech face to the head spacing shoulder) to my specification. I'm not specifically talking about the chamber being 0.001" longer than the case... HOWEVER... Why would you need 0.005" headspacing IF you verify that all cases are 0.001" UNDER the aforementioned breech to headspace shoulder dimension "as loaded"? It would seem to me that the gun should run fine as long as the case headspaces on the shoulder and allows the gun to go fully into battery. Actually, intuitively it would seem that this would offer several benefits: 1) the round would HS on the case mouth rather than the extractor, 2) there would be less "breech slapping" (or stamping) of the case back into the breech face, 3) you would have a consistent round to round location of the projectile within the chamber with respect to the lands... I don't propose to run any 'ole fodder through this barrel. It'll strictly be fed rounds with cases hand selected/trimmed to spec.... (e.g. 0.845" cases on a 0.846"+ chamber), from the same manufacturer, lot, run, etc. Individually measured charges, heads matched to within +/- 0.1 gr in weight and inspected/measured for consistent concentricity and any imperfections..... yadda, yadda... Assembled on a highly tuned press which will yield exacting tolerances for seating depth, crimp, et al... I am aware how all this sounds, but the point (besides looking for the limit on accuracy) is to eliminate as many variables as possible (or control them) such that the data on the measured variable (chamber design/dims) is definitive. If I am missing something, by all means, educate me... I don't want any surprises that can be avoided. Thanks,

I think the principle would be: Can the slide release be used as a thumb rest, thus offering a shooter an "unfair" advantage in controlling recoil. i would think if it was clear by the design that the intent is ONLY to use it as a slide release, that it would be allowed...

OK... thumb rest is out then... I really would need to BE THERE to get it in the right position anyway... Just gotta get something definitve on the slide release before i invest a bunch of time to design one...

I searched and did not find a definitive answr to the following... and I have been given conflicting answers on this too.... 1) G35... You have a grip reduction done, and as part of it, a thumb rest is molded on... I have been told that this is legal, but MY reading of the Appendix for US Limited says it specifically isn't " External mods... not limited to thumb rests and extended slide stops" 2) Related... I have small hands (short thumbs). The G35 comes stock with an extended slide release, but it is too short for me to reach with my SH thumb without changing grip. Would it be legal to modify the stock extended slide stop and or replace it with one having a longer lever that could be operated with the SH thumb without changing grip? I'm about to send my frame off for grip mods, and I don't want to even consider anything that'll cause probs... Thanks, Clay

0.005" isn't NEARLY close enough tolerance on the depth of cut for me. For reasons I won't spend the time to discuss here, I need it to be around +/- 0.001" or better. This isn't a "typical" handgun barrel....

Just got a response from Franco at CR Speed/RHT... the thread size is M3. Here are some links to McMaster-Carr's selection: Part# 96445A330, Stainless Steel $1.60 each Part# 90368A150, Stainless Steel $1.42 each Part# 96115A420, Brass $1.03 each They're actually all on the same catalog page... I linked them separately, so that each part will be highlighted individually in tan. Hope this has been of some help to y'all. Had a guy at Area 4 lost one of his too. Sounds common.

Frankly, I can't understand how there can be folks on both sides of this discussion. There was a man down range... DQ, end of discussion. This isn't a USPSA/IPSC rules situation. It's hard-core, inviolable range rules.... carved in stone. If a man on one of my ranges in the service had touched his weapon with anyone forwad of the firing line, he would have suffered a lot more than a DQ and loss of a match fee. The Range Officer/Safety Officer, be he IPSC or any other, is there to make the tough calls... this was NOT a tough call. It was a wrong call. The RO in this situation is dangerous. He NEEDS to be addressed about this situation, preferably by he RM from this match or omewhere further up the chain if need be, and cautioned to sharpen his judgement or turn in his RO credentials.

Patrick... "he trick is finding a machinist who can do the setup correctly (everything centered) and will then ream to the exact depth you specify." Precisely...

OK, GuildSF4... I stand (semantically) corrected... "Cleaner" powder would/sholud improve accuracy... less fouling of course, but not really significant. IMHO, more importantly, clean burns (read: complete) indicate that you are consistently getting all of the energy out of a given powder charge. In a lot of cases, the "dirt" you see is unburned/partially burned powder, meaning you did NOT get all available energy... This SHOULD show up in inconsistent/"larger" variations in velocity.

Here's the deal... the vast majority of folks scoff at the idea of ultra-accurate auto-pistols... even in IPSC.... Why? I don't know. Maybe because a lot of the shots are close, big A-zone, etc. OK... Here's the way I look at this whole accuracy thing. Say, and average pistol off-the shelf shoots 2.5" groups from a rest at 25 yards. (IMHO, there are a LOT of unsubstantiated and WAY overstated group sizes being claimed out there). OK, so you are shooting with this pistol... What does a 2.5" group mean? Assume you POA and POI coincide exactly for your pistol. In my book it means that if your point of aim happens to be dead on the A/C line at the break, then you have a 50% chance of claiming a "C". Say, at break, your point of aim is an entire 1" INSIDE the "A" boundary. You STILL have a fairly decent chance of dumping a "C". To "GUARANTEE" an "A" hit with a pistol shooting 2.5" groups, your POA has to be at least 1.25" from any/all "A" boundaries. Look at it another way... With a pistol like this, you are effectively reducing the center A zone from about 420 sq. cm to right at 187 sq. cm..... a whopping 55.4% reduction in target area. Here's a simpler look... A 40 S&W bullet is 0.400". Say you shoot a match and miss winning it (your class or whatever your goal) by the points you would have gotten had you not dropped that last C... That last C fell just outside the A boundary.... It came REALLY close to cutting the line. In this case, had your pistol/ammunition been able to shoot 2.25" groups, that C would have been an A... Anyway... I'm still trying to come up with a "tada" example to demonstrate why super accuracy is a desirable thing in IPSC... A lot of folks are spending big bucks to get that last little bit of.... whatever out of their pistol... reduced muzzle flip, lighter trigger, etc. At some point your dollars per unit improvement ratio gets wayyyy out of whack. I think there are some new (relearned) approaches that will open up some relatively low dollar improvemnts... Some of those are in creating better ammunition... Look at it this way from the ammunition stand point... Say you want to put 2 bullets through the same hole. If ALL pistol and environmental conditions remain the same, then the ONLY non-random way to put teo bullets in the same hole (zero group size) is for the two rounds to be/perform identically. Assuming two rounds are physically identical, the only way for them to travel the same path is to leave the barrel at the same speed and from the same point in space. Shooter controls the point in space... the reloader controls the speed. IDENTICAL ammo, round to round, is realistically impossible, BUT I DO think it is achievable to get reliable/repeatable 10 round group sizes under 1" at 25 yards in a pistol (even a Glock) with a relatively small dollar investment on top of what folks already have in their weapons. Sorry to go so long... It's late; I can't sleep, so I tend to get long winded.

Mmmmm.... I don't know about 1911s, but Glocks with "normal" leads and throats cut in the chamber have a very large projectile jump prior to touching the throated lands (much less getting to the full height lands)... Example: G22 w/ KKM G22D1 barrel with Remington TC JHP bullets: The "typical" OAl is 1.126 recommended in the manual. The projectile makes first contact with the lands at 1.301"... That's a 0.175" or almost 3/16" jump to the lands... ASSUMING the round is actually headspaced on the case mouth rather than the extractor groove.... Typically, you can add anywhere from 0.003-0.006"+ depending on the case free measurement, as most Glock chambers are 0.850 " to the headspacing shoulder, and NEW brass is ALWAYS shorter than this. Starline quoted me 0.843-0.848" for their NEW brass.... quite a large tolerance BTW... and 40 S&W shrinks from firing to firing... the magnitude primarily dependent on the chamber diameter... looser chambers allow the brass to flow more. Loading long in a "stock" Glock chamber doesn't give you near the accuracy increase (due to mag constraints and large lead dimension) as I suspect the 1911s do because max OAL while still able to feed reliably still results in a significant jump... the 1911 based weapons 9again due to mags) can load much longer than Gocks, and thus their bullet jump is much reduced. However, at some point, loading too long 9besides reaching feed problems) might actually be counterproductive as the total tension/retention area is reduced... I did a preliminary test of reducing bullet jump in a G22 several years ago, and achieved a respectable 30+% group size reduction over the stock barrel and almost 20% group size reduction over a "stock" KKM barrel... This was with a non-optimized chamber design and a non-optimized load (I didn't tailor the load for accuracy... only semi-physical consistency from round to round). Bottom line.... loading long has serious accuracy implications IF you optimize chamber design. I am working on this project again BTW... This time with a more optimized chamber design and in a G35. Results will be reported here on the forums if anyone is interested. I found a place to get the new barrels today in fact. If you are interested in reading my old article, check: HERE.

That is so cool... Nah, she'll be into it as long as it's fun...

http://www.mcmaster.com/ look on the right at the bottom at: Fastening and sealing look under that category for: Nuts... Click it look for "Thumb Nuts"... click it choose metric thread size... click it Continue to drill down, til you find the one you need/want... I could spend ALL DAY in the M-C fastener department....

Just what I needed... Thanks!

Can someone help me locate a reputable gunsmith/machinist to do a job for me? I'm getting a "smith fit" G35 barrel blank from one of the better barrel makers WITHOUT the chamber reamed. I have a custom carbide chamber reamer that I want used to create the chamber in this blank. I usually have the barrel maker do this, but they are all either too busy or their production schedules for G35 barrels aren't meshing with my time frame. Thanks,

Hey, can one of you North Texas guys/gals give me directions or a physical address of the Johnson County range in/near Cleburne/Colleyville? They do a 1st Sat. match and I'm trying to line out getting there for the next one. Thanks,

Here's the link... It's at the top of the forum right now... No solution yet, but the discussion is being had: New 40 S&W mags and #6 followers

Never mind... Sorry, I just found a thread specifically talking about this... Moderator.... Feel free to delete this thread at your discretion and leisure.

I know there are tons of threads on mags and such, but my search didn't reveal an answer to this one... Flex made reference in an old thread to Novak's follower to get an extra round. An email to him last night reulted in a response from him that the latest generation followers don't have enough material in them for the modification he does (for the 40 S&W). They're "hollowed out", no doubt to save that $0.001 per part on injection molding material. In any event, does anyone have any ideas how/where one could go for a solution to getting that last round in the mag?

.40AET - Just for the heck of it, try loading up a batch to test the following theory: Your ES was reduced when you went to same headstamp... What about if you went to the same headstamp AND made sure all the cases were the same length... Differing case length can change the "effective seating depth"... The base of the bullet ends up in the same place, but the additional length acts as additional "grab" on the side of the bullet.... Cases shorter than "ideal" do just the opposite. I've had "well sorted and culled" brass in a small batch of 100 run from 0.841" all the way up to 0.848". BTW, I proved to myself that .40 brass does IN FACT shrink over time. Additionally, I've seen measurable variation in case wall thickness even within the same headstamp... (different lots?). Thicker case walls act just like longer cases... increasing the total force applied in retension of the projectile. Finally, I used a BUNCH of the MG TMJ... While I liked them fine, IIRC there was a significant weight variation in small samples... on the order of grains rather than tenths of a grain. I weighed and sorted heads for additional consistency. That was years ago though... Yes..... I am very "picky" about certain things. ... some would say about e verything.

.40AET - In my G22, I did some test loading using MG 180gr TC FMJ over 4.9-6.0gr of VVN340 in Winchester Brass and WSP primers to an OAl of 1.140" in a custom barrel with only 0.005 (+0.000"/-0.002") of bullet jump (reduced lead length et al.) This test was primarily to check safety of the max published VV N340 charge with a reuced BJ.... no signs of pressure probs. Unfortunately, I didn't have a chrono at the time, so I don't know what the velocities were. Subjectively, even the max loads were tamer than factory loads. I still have 4lbs of N340, and now have a chrono, so I will be starting over to develop a load for the G35.... again with a short lead in the chamber. But this time, I'm goin to reduce the breech to headspace step from the standard 0.850" to something less than that, trim cases so that they will headspace on the step with minimal room to slap back on the breech face. I'm also going to be using a new bullet... This time, i'll be using the new Precision Delta 180gr FMJ (not a TC... has a 22 degree noase radius and reduced flat tip). I'll be building a db of the chrono and ballistic info for this setup from minimum to max+ to see where the PF breakovers are, where the best group sizes fall, e t al. This db will be used as the base data for tuning a load for my G35 limited pistol.

+1 Liota... Met TJ on 4,5,6. Friendly, personable, in shape, has his act together... period. VA still grows Southern Gentlemen.