rc51g Posted October 3, 2015 Share Posted October 3, 2015 (edited) I have a 2005 mat mclearn 38sc open gun. It has a Schumann aet hybridcomp barrel. It has always run well. The other day it started jamming with spent cases left in the chamber. The brass has marks on it from extractor ripping past it. The brass is so tight in chamber that u have to pull it out with pliers or pry it out with screwdriver. At first I that maybe a dirty chamber so I cleaned it but it isn't any better. Cleaned Fired brass is very difficult to push back into chamber. Could the chamber b cracked? I don't see any marks on the brass like a line or anything. They do have a bulge but they always have. Also when this started happening I thot my rounds were too hot. Chonoed the rounds and they were almost minor due to my lack of knowledge of my powder being reverse temp sensitive. I usually run close to 175pf. Now the gun won't run long enough to get through a stage so matches are out. I don't want to send it off quite yet. I was just wondering if anyone had some insight on it or the possibility of a cracked chamber. Thanks Edited October 3, 2015 by rc51g Link to comment Share on other sites More sharing options...
Glk21C Posted October 3, 2015 Share Posted October 3, 2015 have you checked the extractor tension? and what kind of extractor is in there? std type or an Aftec? Link to comment Share on other sites More sharing options...
rc51g Posted October 3, 2015 Author Share Posted October 3, 2015 Affect extractor with good tension. Cases are just so tight. I'm getting ready to check it out some more. If I have anymore info I wil post it. Link to comment Share on other sites More sharing options...
rc51g Posted October 3, 2015 Author Share Posted October 3, 2015 Actually aftec and egw extractors (I think) and it does it with both Link to comment Share on other sites More sharing options...
rishii Posted October 3, 2015 Share Posted October 3, 2015 Have you changed any of your re-loading components, bullets, powder, brass recently And have you tried dropping a loaded round into the chamber to check if it passes the plunk test, if it doesn't check your re-sizing die you cleaned the chamber, did you also clean the barrel From your description it sounds like maybe high pressure is causing the cases to stick in the chamber I've never seen a cracked chamber, but to check for a deformed one, clean the barrel well, then hold the barrel at a slight angle, while turning the barrel slowly, look at the chamber walls for a dark spot. Link to comment Share on other sites More sharing options...
rc51g Posted October 3, 2015 Author Share Posted October 3, 2015 Hmm. I cleaned the chamber and barrel. I'll check it out for dark spots this evening. Thanks Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted October 3, 2015 Share Posted October 3, 2015 Have you changed any of your re-loading components, bullets, powder, brass recently have you dropped a loaded into the chamber (the plunk test), +1. Your brass should NOT be stuck in the chamber. My guess is something creating lots of pressure with your reloads (OAL, powder, etc). I'm not sure how a PF 175 could go "nearly minor" due to reverse temp sensitivity - that sounds a bit extreme, to me. I'd check you powder charge, OAL and start chrono'ing (that a word?) your loads after you run the Plunk Test. Link to comment Share on other sites More sharing options...
bountyhunter Posted October 3, 2015 Share Posted October 3, 2015 Cleaned Fired brass is very difficult to push back into chamber. Brass problem? How easy does it drop in before it's fired? How are you sizing the brass? Link to comment Share on other sites More sharing options...
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