Lstand Posted December 9, 2017 Share Posted December 9, 2017 I recently purchased a used Trubor from a friend and have had a strange accuracy problems with it. When shooting from a rest the first shot is always low and left, very consistently. I have tried replacing the slide stop with an oversized one which did seem to "tighten up" the barrel lockup. I have also tried different sized links. The slide stop pin seemed to help some, the first shot was initially about 6 inches low and left at 12 yards, it then went to about 3. After a few hundred rounds it is getting a bit closer but still way off. Its obviously some sort of problem that is only happening when manually releasing the slide that is not happening when the slide cycles in recoil. Any advice? Thanks Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 9, 2017 Share Posted December 9, 2017 Massad Ayoob has been preaching for many decades that auto shooters suffer from this first shot miss phenomenon. I've never heard about 6" at 12 yards, though. How is the accuracy of the remaining shots? Can you fire a 2" group at 25 yards, from a bench, of course without the first shot? Or is the gun at fault? Link to comment Share on other sites More sharing options...
Aircooled6racer Posted December 9, 2017 Share Posted December 9, 2017 Hello: Shoot it off hand not on the rest and see how it shoots. Thanks, Eric Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 Jack, after the first shot the groups are pretty acceptable. The thrown first shot is actually pretty consistent about where it goes as well. 3 5 shot groups at around 15 yards yielded 2 ragged holes. The Trubor I bought from you had excellent accuracy so I know its possible. Eric off the rest my own inaccuracy came into play some so it was harder to tell exactly. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted December 9, 2017 Share Posted December 9, 2017 Hello: The first shot maybe off since the first round may not be going into battery the same way as the others after the first shot. Pull the slide back all the way to the back for the first shot, don't just drop the slide with the slide stop. See if that makes any difference? Thanks, Eric Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 Eric I tried that as well, didn't seem to make any difference. Link to comment Share on other sites More sharing options...
Chillywig Posted December 9, 2017 Share Posted December 9, 2017 What caliber? What's your bullet? OAL? Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 9mm major. 115 MG JHP with 7.7 WAC, also had some 124 MG JHP that I tried I think they were around 7.0 WAC.. 1.165 OAL. Link to comment Share on other sites More sharing options...
Chillywig Posted December 9, 2017 Share Posted December 9, 2017 I assume the STI barrel will plunk and spin that load no problems? Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 I just tried it and yes it does. Link to comment Share on other sites More sharing options...
Chillywig Posted December 9, 2017 Share Posted December 9, 2017 Try close the slide empty gun. Look at gap between slide and comp. pull trigger. how much does gap close? What recoil system/spring? Link to comment Share on other sites More sharing options...
RaylanGivens Posted December 9, 2017 Share Posted December 9, 2017 5 hours ago, Lstand said: I recently purchased a used Trubor from a friend and have had a strange accuracy problems with it. When shooting from a rest the first shot is always low and left, very consistently. I have tried replacing the slide stop with an oversized one which did seem to "tighten up" the barrel lockup. I have also tried different sized links. The slide stop pin seemed to help some, the first shot was initially about 6 inches low and left at 12 yards, it then went to about 3. After a few hundred rounds it is getting a bit closer but still way off. Its obviously some sort of problem that is only happening when manually releasing the slide that is not happening when the slide cycles in recoil. Any advice? Thanks Ask your friend if he had the same problem. Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 No change in gap when i pull the trigger that i can see. Regular recoil system just put a new 9lb spring in. Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 He said he didnt really shoot it enough to know. I guess he bought it thinking he wanted to shoot open then changed his mind. Link to comment Share on other sites More sharing options...
Chillywig Posted December 9, 2017 Share Posted December 9, 2017 OK here's my last witch craft thing I can think of Is the trigger pull weight consistent no matter how the hammer gets cocked? Rack slide pull trigger cock hammer pull trigger with hammer down trigger pulled rack slide reset trigger then pull trigger Link to comment Share on other sites More sharing options...
Lstand Posted December 9, 2017 Author Share Posted December 9, 2017 Just tried that and they were all within an ounce on my Lyman trigger gauge. I appreciate your help. Link to comment Share on other sites More sharing options...
mscott Posted December 9, 2017 Share Posted December 9, 2017 Shoot it left handed and see what happens. (or right handed if you are a lefty) Link to comment Share on other sites More sharing options...
superdude Posted December 10, 2017 Share Posted December 10, 2017 Massad Ayoob is correct that it is not unusual for some guns to have the first shot go wild. It's that first hand cycled round that does not lock up like the remaining ones that are cycled by firing. I shoot lots from a Ransom Rest. With some guns, the first shot might or might not be wild - even in a seemingly tight gun. With one of my guns, the first shot is ALWAYS several inches from the rest of the group - and in the same location. For this reason, many folks who shoot with a Ransom Rest will fire the first (hand cycled) round into the berm. I don't know if that is the cause behind what you're seeing, but it's not impossible. Link to comment Share on other sites More sharing options...
Lstand Posted December 10, 2017 Author Share Posted December 10, 2017 Did it only happen when you shot from a rest? Link to comment Share on other sites More sharing options...
Chillywig Posted December 10, 2017 Share Posted December 10, 2017 The only other thing that can help single it down to the gun - try some factory ammo and see if it preforms the same as your major loads... Link to comment Share on other sites More sharing options...
superdude Posted December 10, 2017 Share Posted December 10, 2017 9 minutes ago, Lstand said: Did it only happen when you shot from a rest? There should be no difference if shot from a rest or hand held. The advantage of the rest is that it eliminates human-induced error, thereby demonstrating the mechanical effects of parts alignment. Link to comment Share on other sites More sharing options...
Lstand Posted December 10, 2017 Author Share Posted December 10, 2017 So the gun you have that is always several inches off on the first shot you just accepted thats how it was or were you able to fix it? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 10, 2017 Share Posted December 10, 2017 7 hours ago, Lstand said: Jack, The Trubor I bought from you had excellent accuracy so I know its possible. Welcome aboard, Lamar. Glad to hear you're happy with my TruBor Sorry, can't think of any other possibilities to solve your problem with the first shot going wild (consistently). Jack Link to comment Share on other sites More sharing options...
cheers623 Posted December 10, 2017 Share Posted December 10, 2017 Hopefully I can help. Had exactly the same problem with my wife’s brand new Trubor. First shot off a rest or off-hand, didn’t matter...always 3” to the right of POA at 25 yds. Then every other round dead center POA. Videoed it with three 10 round strings out of three magazines. Printed one 3 round group at 3” to the right and one 27 round group dead center the bullseye. Checked slide stop, barrel feet engagement, and barrel hood lockup. The barrel hood had tons of slop in the breech face cutout. Sent the gun to STI and they replaced the slide AND barrel. Problem solved.... YMMV Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 10, 2017 Share Posted December 10, 2017 1 hour ago, cheers623 said: Sent the gun to STI and they replaced the slide AND barrel. Problem solved.... What did STI charge for the new slide and barrel ? Link to comment Share on other sites More sharing options...
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