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Post by Quick Draw McGraw on Aug 14, 2017 14:58:55 GMT -5
RANGE UPDATE!!! So with the threaded LWD barrel and Alpha Wolf Compensator on I took some 230 grain XTPs to the range. They chronographed an average of 1,170 fps, which was a slight bit faster than I was looking for. But since I was looking for 1,100 fps, I'm very happy with the results. The rounds were very accurate and the compensator made recoil very manageable. The higher powered mag springs and mag shims made a big difference with the only time I had a magazine drop was when I loaded 13+1. The #24 recoil spring had one malfunction, an FTF. I then tried the #22 and #20 which had no problems. So the #24 is out.
Only crappy thing was the Compensator became loose despite the blue loctite. In trying to tighten it, it stripped the screw. Booooooooooo! LWD is sending me a new screw as we speak.
The Springfield Range Officer 1911 functioned flawlessly with a #24 spring and a higher power firing pin spring. My CMC mags had trouble locking open on the last shot, which has happened a lot on higher powered rounds. Otherwise fine. But the recoil from the .45 Super in a non-comped 1911 was pretty intense.
One last note, my ported G21 LWD Barrel shoots at a lower POI. So did the ported G20 Storm Lake barrel I used to have. I'm noticing a trend.
cmillard - I remeasured my .460 Rowland 200 grain loads and this time they averaged 1,432 fps which is the ball park of my load data and makes WAY more sense. So my previous post illustrates an inaccurate chrony like you mentioned. I should note, the chrony was further back by about 4-6 feet which probably made a difference as I was finally reading regular .45 Auto loads accurately for the first time. They too always read unreasonably high (like 1,250 fps).
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Post by bradshaw on Aug 15, 2017 10:58:17 GMT -5
"my previous post illustrates an inaccurate crony... I should note, the chrony was further back by about 4-6 feet which probably made a difference as I was finally reading regular .45 Auto loads accurately for the first time. They too always read unreasonably high (like 1,250 fps).” ----Quick Draw McGraw
*****
Pressure and the Auto * A centerfire auto pistol occupies a smaller rpm range than a revolver. To increase velocity in the auto requires close observation of pressure signs, the first of which is premature unlocking and slide movement. The second is slide impact against the frame. One excessive load can do more damage to the auto than thousands----many thousands----of standard loads. Metal hammering ramps fatigue. Permanent damage can accompany a small increase in velocity. Unless the brass itself is intended for higher pressure, this “head gasket” may fail; if the brass holds, its reloading life may be consumed in one shot.
The DELAYED BLOWBACK designed by John Browning (which Glock incorporates) allows a pistol to be much lighter than with STRAIGHT BLOWBACK, which requires a much heavy bolt or slide. In working up handloads, it is important to have a feel for the pistol.
* A chronograph is a great asset to load development. Nevertheless, freak readings should not be believed without verification. The second, or verification channel was a major breakthrough of Kenneth Oehler’s 35 Proof chronograph.
* A powder which may work well for the same cartridge in a revolver may accelerate slide speed in an auto. Some powders on the slower end of the medium burn rate act to increase slide speed and hammering.
* Since velocity is the reason for the .45 Super, the chronograph is part of load development. For example, between two powders which produce similar velocity from the same bullet, one may cause early unlocking, while the other causes hammering. (Firing pin drag on the primer and/or casehead may indicate premature unlocking----or fast unlock geometry, or weak spring.)
* Hot loads may quickly cause accuracy deterioration in the auto. David Bradshaw
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Post by Quick Draw McGraw on Aug 15, 2017 12:26:16 GMT -5
Ummmm... Not discounting any of this, and I am sure you are correct, but I don't understand the quote of me mentioning about the chrony not reading accurately.
Perhaps I should explain what I meant with the accurate .45 Auto readings. Every time I try to read any factory or handload of .45 ACP, the chronograph has always read over 1,200 fps. There's just no way that is accurate. Especially with some of the standard Magtech, Winchester, and Sellier & Bellot loads I have tried to chronograph. My .44 Specials and .45 Colts all read in the 800 fps to 950 fps and that is where they should be according to my loading manual. So I figured if the revolver (which has a cylinder gap) is reading right, maybe something is flying through my chrony along with the bullet that is skewing the data. So this go around, I moved it back 4 or so feet and gave it a try. FINALLY, I was getting readings for the .45 ACP rounds I was trying to chrony that were in the ballpark of the load data and/or factory manufacturer's claims.
I hear what you're saying about slide movement, unlocking, and frame/slide damage. I'm trying to proceed slowly and carefully. So far, I strongly feel that the use of a compensator with the .45 Super has made a big difference, even over a 2-port barrel. The gun feels much easier to control and feels like the the whole function is much smoother. So I really prefer to just keep my .45 Super rounds only going through a compensated barrel.
On a side note... When I installed the compensator I used blue loctite on the threads of the attachment screw but not on the barrel threads for the compensator. Should I be doing using blue loctite on the barrel threads?
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Post by bradshaw on Aug 15, 2017 14:30:53 GMT -5
Quick Draw McGraw.... Loctite Threadlocker Red 272 may keep your compensator from coming loose. To remove requires heat, and Loctite recommends 500 Fahrenheit. Agree with you, a compensator should save wear and tear on gun as well as shooter. Conceptually, a compensator that retards slide movement----slows unlocking----should greatly reduce battering and the chance for a case blowout at 6 o’clock.
A slow moving pumpkin ball compresses air into a wave, which may confuse a photo electric “eye.” One solution is to place a plywood window between muzzle and start screen. Or, do as you have----increase distance between muzzle and start screen. David Bradshaw
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Post by ss30378 on Aug 15, 2017 19:04:33 GMT -5
I use blue lock tight on both the barrel threads and locknut threads on mine. Mine has a huge 5 port steel comp to slow the slide down. Even with extremely hot loads cases only fly a few feet away.
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Post by Quick Draw McGraw on Aug 15, 2017 19:44:37 GMT -5
Nice... No matter what I do to my Glock 20, those 10mm cases fly halfway across the country!
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awp101
.401 Bobcat
TANSTAAFL
Posts: 2,658
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Post by awp101 on Aug 15, 2017 20:38:26 GMT -5
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Yetiman
.327 Meteor
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Posts: 582
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Post by Yetiman on Aug 15, 2017 21:46:46 GMT -5
I think some of my 10mm brass out of my G20 still hasn't landed yet.
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