coltgov

Here you go Flex. http://www.thefiringline.com/forums/showthread.php?t=81858 Read the post by Clark! He used a Glock 19 with a 48lb recoil spring. This is the HS6 test for max powder. First is the max book load. Then his kaboom loads. 2) Hodgdon max: 115 gr, 1.125", 7 gr HS-6, 1234 fps P11 test: 115 gr, 1.168", 10.8 pierce RP primer, 11.2 gr pierce WSPM, 11.5 bulged case ~ 2027fps

I'm just going to do some hypothesizing and hope it makes sense. If you fire a blank there is no built up pressure so the jet effect of the expanding gas is minimal. You cork it with a bullet, and it's like a bomb, and if channeling the high pressue gas to the point of least resistantance such as pushing the bullet out the barrel and creating the high pressure jet effect as the bullet leaves the barrel. This is a secondary force after the primary force of accelerating the bullet down the barrel. The secondary force of the gas can be used to lessen muzzle flip and backward primary recoil. The gun piviots up since the barrel is above the hand acting like a lever creating torque. With the comp the gas is redirect to control muzzle flip and all gases should be expelled before the bullet exists the comp to be effective. As to the size of the ports in the comp, this will determine how fast the expelled gas is expended. Fast creates more thrust and more push. This deals with the muzzle flip. Now to lessen the primary recoil you need surface area to let the gas push against so the barrel/gun is pushed forward. So the most effective comp would be smaller holes at the top and side surface baffles for the forward push. There is an article in the current Front Sight magazine testing the effectiveness of different rifle comps. Interesteresting reading.

By your screen name you must be the one in the back row extreme right!

Be careful when drawing your gun! No first stage, light second stage, no safety. Yikes!

Can we sight in at the range? Just found my rear sight was loose and had to take it apart to tighten the set screws. A52391 Squad 16

I will never shoot "coated" bullets thru a stock Glock bbl again. Two months ago, I had 2 KB's with two different guns in 2 weeks. The first was a Glock 20 10mm using 4.6gr of vv320 under a 180gr Masterblaster (poly coated) bullet. I fiqured it must have been a double charge and moved on. The following week, I used the same powder charge of 4.6gr under a MasterBlaster 145gr bullet (OAL 1.140) for minor 40SW loads in a G22. These chrono'd around 150pf. On my 3rd stage of the match...KB. What the hell? What was I doing wrong? Is it possible the I double-charged twice in 2 weeks? Since I've shot 10's of thousands of reloads in 1911's (and Glocks with aftermarket bbls) without incident, I didn't think "reloading error" was to blame. Why is this only happening with Glocks and what is the common denominator? The most logical culprit was using non-jacketed bullets in the stock barrel. I have since switched back to my STI and, as expected, haven't had a KB. I'm sure that although many people (including me) have successfully fired coated bullets in stock Glock bbls, the combination prooved ugly for me. I won't do it again and I'd recommend against it. Be safe. T What I noticed with the poly bullets and stock barrel, the recoil is much heavier with lots of smoke and muzzle blast. I think the bullet is not spinning with the rifling in the bore by not catching in the rifling since the glock rifling is round and not square. This is grating the poly coating off the bullet and smearing it all over the bore. The more you shoot, the more pressure gets built up. You feel it in the recoil and lots of smoke and more muzzle blast. Also keyholing. When I changed over to the KKM barrel, the barrel still collects the polly but doesn't build up. Recoil is normal just like a jacketed bullet. Just a little more smoke and no keyholing.

I've had this happen to me personally. I was dry firing and noticed the striker "click" sounded different. Glock replaced the slide for free (and I was not the original owner) and told me to use snap caps. Did you have a stock striker spring or reduced striker spring?

Only kabooms I've seen are double charges or firing a bullet behind a squib or or too hot of a load or not enough crimp resulting in bullet setback. So don't use reloads from anyone you don't trust. Having said that you said you do trust your own reloads and have been doing it for 20 years. Then you'll be fine! Reloading for the .40s&w is no different than any other caliber.

Did you get the LW major 9 prototype comp? It has three bigger holes on top, and 1 more port on each side. It controls major PF muzzle flip well for me. It's the same comp they use on the .40 barrel. In the future I'm going to get a SJC type comp made for my LW barrel. If the SJC thread pattern was the same, I would have bought the SJC first instead of having one made. All I can say is comps work so much better than ported barrels such as my 17c barrel. Anyways I agree the LW design is very unique. Good luck at your matches!

It takes exactly 6.6 of WSF to make major in a open Glock without barrel ports. You think the powder is WSF. My gut instincts say definely yes!

Here you go! A little information about the comp: JR at LW designed it. He got the idea from a howitzer. Before muzzle brakes were put on howitzers, they had a limited range because too much powder would flip it. After the muzzle brake, powder could be increase to the capacity of the barrel with no lift. Projectile distances were greatly increased. The LW comp looks unlike any open gun comp, but it works. Gases are directed up and back, pushing the gun forward and downward. The side ports also stabalize the barrel returning it to the same POA. I once read a thread here about a RO on the chrono stage. He chroned 20 open guns in a row, with many different comp configurations. He couldn't tell the difference between them!

Here is my final update for my open Glock built with all drop in parts: JP sights, 13 lb ISMI spring, tungsten guide rod. LW 9mm threaded barrel with LW custom major comp. No magwell yet. My 8.0 hs6 load chroned 1340 avg with the 125 Zero JHP. Lone Wolf made me a custom major comp. The same style as the 40 comp to fit their 9mm barrel. It works very well. Got to do a side by side comparison with a STI hybrid which was comped and with 4 ports cut in the barrel, and it's similar in muzzle rise and recoil. Dot barely snaps up and consistently back down again to POA. Makes for quick doubles! The STI had a full mag with brass base pad, and my Glock was only loaded with 6 rds no magwell using a Taylor Freelance extension. Must have been half the weight of the STI. The comment from the STI shooter. "This thing is so light!" And after firing a few "Feels great!" Then I fired his, and besides being heavy, felt no difference in recoil or muzzle rise. One thing I must do is either double plug or wear heavier muffs. The blast will give you a headache after a while if you don't. The power and control of a major gun is amazine and addicting!

NROI ruled only not legal for Production. Legal in L10, Limited, and Open. If you are a USPSA member, it is also mentioned in a thread in the forum. http://www.brianenos.com/forums/index.php?showtopic=53055

It works. The exit hole is just slightly larger than the bullet. The inside is not hollow out, but the same size as the OD of the barrel. It works so well a worn out 13lb ISMI spring will barely cycle the slide with factory ammo. You need at least 150PF because the comp is pushing the receiver forward and down when the bullet exits the comp. With the minor comp and 160 pf, the muzzle doesn't jump. Rather the whole gun levetates with no felt recol. The bigger LW comp should work even better with 170pf.

Major works with the minor comp. LW is also making me a major 17 comp like their .40

If anyone want to know why the primers are all over the place this is why. The Dillon decapper is spring loaded so when the primer gives the decapper is unsprung shooting the primer into the cup where it can bounce out of the sides where there is daylight. Somehow it never bounce out the front opening. If you tape the edges of the cup with electrical tape so no daylight show when the cup is place back in the holder, then the primers have no way to bounce out.

If you let your friends use the chrono, be sure to tell them how high to shoot. He did get me a new one.

Their LW minor 9mm comp works great. I'm having them make me a custom one in major too. But if you do build one in major that works great, I may be interested to buy one from you.

I've replace a number of them on my G20, and G17, G34 that were chipped on the left side of the tip. The chip keep growing until there is only a half a tip left. Recently have been sanding them down so the surface is even again. I've wondered why this has occurred, and the only answer is gas erosion from pierced primers. Upon comparing the strikes from a 2011 with the Glock, the Glock is much deeper with flow into the firing pin hole and cratering. Could be a design flaw when shooting faster burning powders with pressure spikes. Glock striker is too heavy and doesn't give like the 2011. Firing pin hole is also bigger.

Chronoed 7.5 HS6 Zero 125 jsp 1.16oal. Averaged about 1270fps about 159pf. Have to bump it up to 8.0 now. LW 17 threaded barrel with LW comp. No ports in the barrel. Primers were flat, but no primer flow into the firing pin hole. Looks better than my 147 grn minor loads. Lots of primer flow with those. This tells me the pressure is gradual without a spike. So I'm good to go to 8.0 HS6.

I was wondering about that too. It stands for I(international or ipsc I guess) FP(flat point) now with a jacketed base. Will give it a try. MG is great to deal with too.

No shok buff. I was told Wolff springs give a little bit more clearance in the guide rod channel, lets the barrel drop a little bit more. I use 13# ISMI in my G34 production gun. I haven't tired ISMI in my open SJC glock. I was going to try 10# wolff and 11# and a worn out 13# ISMI for my minor load and see how well it runs. Thanks HoMiE! Just got 3 from Midway, and the Lightening Strike guide rod. Worn out 13# ISMI works great for me. I'm using HS6, but I want to try WSF in the future. You helped me a great deal, and I should be alright now. Just have to work up my load and see how my dot tracks! Will be great to shoot flat out major, than having to slow down with minor to avoid dropping extra points. Now I only have to do that in production.

14# Wolff, round like 1911 spring. Brass ejects about 7-8 feet. Thanks HoMiE! That is good slide velocity. You use a shok buff? What is the reasoning behind using 14# wolf vs 13# or 15# ISMI. What spring do you use for minor?

I can tell the KKM is on the left.

If you are using a U die, you can see the bulge where the bullet seats to in the case. A Dillon die is seamless. So yes the cast tension is much greater with the Udie, and much more effective to prevent bullet setback.