PaulW Posted February 4, 2013 Share Posted February 4, 2013 (edited) Picked up a new Trubor 38 super and after test firing, shooting the match Saturday, and some steel practice Sunday I noticed that I am already getting some bad breech face erosion. This after 300 major pf and 300 minor pf loads. Is this normal. I have owned my share of open guns and never recall seeing this happen so fast on an open gun. Edited February 4, 2013 by PaulW Link to comment Share on other sites More sharing options...
PKT1106 Posted February 4, 2013 Share Posted February 4, 2013 Pictures? Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Pictures Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Link to comment Share on other sites More sharing options...
daves_not_here Posted February 4, 2013 Share Posted February 4, 2013 Picture #1 looks like you've got a crack too. Odd. Keep us posted. DNH Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Sure does, a few chips out from around the firing pin hole as well. Link to comment Share on other sites More sharing options...
Shadyscott999 Posted February 4, 2013 Share Posted February 4, 2013 What kind of primers are you using? Link to comment Share on other sites More sharing options...
Jon Merricks Posted February 4, 2013 Share Posted February 4, 2013 Back to STI I would say. Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Used 200 federal small rifle, 200 winchester small magnum and 200 tula small magnum. Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Nothing I shot chron'd over 168 pf. Link to comment Share on other sites More sharing options...
edwin garcia Posted February 4, 2013 Share Posted February 4, 2013 Looks a bit excessive. Brand used or new brass? Link to comment Share on other sites More sharing options...
EkuJustice Posted February 4, 2013 Share Posted February 4, 2013 My guess would be the minor loads are what did it and they did not have enough pressure to seal the primer since you were using mag and rifle primers and the gas leaked out and did that which would explain the circle about the size of a primer Link to comment Share on other sites More sharing options...
Jaxshooter Posted February 4, 2013 Share Posted February 4, 2013 I would call STI and forward the pics to them. Certainly should not be like that after 600 rounds. Let us know the out come. Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 Yea working with STI. Brass was used loaded on a 1050 and swagging all primer pockets. Link to comment Share on other sites More sharing options...
Flexmoney Posted February 4, 2013 Share Posted February 4, 2013 If it has a crack, I'd suspect weak metal. Before seeing that, I was going to ask if you were running magnum or rifle primers with the minor loads. I have a theory that sometimes a low power load won't have enough strength to properly force the primer cup to seal against the primer pocket...letting gases jet by. It's only a theory, based on just my one gun with an eroded breach face. [edit to add: wow, lots of responses sneaked in while I went for coffee before posting] Link to comment Share on other sites More sharing options...
HI5-O Posted February 4, 2013 Share Posted February 4, 2013 What was the reason for swaging the primer pockets? Link to comment Share on other sites More sharing options...
PaulW Posted February 4, 2013 Author Share Posted February 4, 2013 IDK....just got the 1050 and it was setup like that. After speaking to Chuck at SC I think I will disable that feature tonight. Link to comment Share on other sites More sharing options...
Shadyscott999 Posted February 4, 2013 Share Posted February 4, 2013 I was thinking the same as Flex. Rifle primers with minor loads can be bad juju. I think. Link to comment Share on other sites More sharing options...
Rick88 Posted February 4, 2013 Share Posted February 4, 2013 Yep, you found your problem. Chuck is spot on and beat me to it. Link to comment Share on other sites More sharing options...
Alphamikefoxtrot Posted February 5, 2013 Share Posted February 5, 2013 I think it is caused by the 38 Super rounds. 9 major won't do that. Link to comment Share on other sites More sharing options...
PaulW Posted February 5, 2013 Author Share Posted February 5, 2013 Haha....Alphamike..riiiiiiight Link to comment Share on other sites More sharing options...
RiggerJJ Posted February 5, 2013 Share Posted February 5, 2013 shouldn't matter with the DE-swager running, if the primer pockets are not swaged, then the de-swager won't do anything... Minor loads with rifle primers is the problem. There isn't enough pressure to seal the primer cups to the pocket walls, because rifle primers have harder cups than pistol primers. jmho... jj Link to comment Share on other sites More sharing options...
Flatland Shooter Posted February 5, 2013 Share Posted February 5, 2013 I think it is caused by the 38 Super rounds. 9 major won't do that. Oh how I wish you were right. Small rifle primers in 150 PF loads hurt my precious slide. Bill Link to comment Share on other sites More sharing options...
Got Juice? Posted February 5, 2013 Share Posted February 5, 2013 (edited) speechless. I would think a bad slide. That is just nasty. And it isn't from using rifle primers either, I use small rifle CCI's in my STI and there is no signs of this happening at all. Is your cartridge headspacing correctly? Edited February 5, 2013 by Got Juice? Link to comment Share on other sites More sharing options...
PaulW Posted February 5, 2013 Author Share Posted February 5, 2013 Only major pf loads were used with the rifle primers. Most we're small pistol magnum primers, not sure how much different those are to small rifle primers? Good news is I am sending back to STI. I have a whole list of things for them to check fix. One thing I noticed tonight is the barrel timing appears to be off, at least in one area. With just the slide/barrel on the frame, slide stop inserted but hanging down, if I press the comp against the bench in theory the barrel should stop against the frame and no pressure should be on the slide stop. Not this one, it is against the slide stop and I cannot pull out or rotate the slide stop at all. It has a #4 link in it so I tried a #5 link to allow the barrel to travel a little more rearward. Bingo that took the pressure off the slide stop. Now I realize that is just one small test to a properly timed barrel but that one is pretty important, IMO. Anyways.....hopefully STI can turn it around pretty quick and fix all the things that are wrong. I also am going to use a different powder and new brass, and only major pf loads for the first thousand or so rounds. I was using Autocomp at 8.1 gr with a 115 gr MGJHP. But after reading up on it that may have contributed, IDK. This is only like my 7th or 8th open gun, just have never seen such a thing happen. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now