jimbullet Posted April 20, 2013 Share Posted April 20, 2013 Has anyone cone across sti mags crimping the 49cal rounds too much and what might be causing it and any solution to it? I've just installed the bolen 11coil springs and follower. With ipsc wedge pads , I get 17 in really tight but noticed that it is crimping every round. Link to comment Share on other sites More sharing options...
jimbullet Posted April 20, 2013 Author Share Posted April 20, 2013 Here is a photo Link to comment Share on other sites More sharing options...
jimbullet Posted April 20, 2013 Author Share Posted April 20, 2013 Try again Link to comment Share on other sites More sharing options...
BASE772 Posted April 20, 2013 Share Posted April 20, 2013 (edited) Got the same problem. Thought I knew what was causing it but was wrong. The brass case is sinking into the lube ring. So far they all still feed and fire. Edited April 20, 2013 by BASE772 Link to comment Share on other sites More sharing options...
jimbullet Posted April 20, 2013 Author Share Posted April 20, 2013 If I put back the original internals, it doesnt do that but of course I want to increase round count, which appears to result to these. I guess, the question is - is this normal or is there anything that needs to be done? Should I cut the 11 coil spring? Link to comment Share on other sites More sharing options...
BASE772 Posted April 21, 2013 Share Posted April 21, 2013 I have no idea but would love to know myself. Link to comment Share on other sites More sharing options...
GrumpyOne Posted April 21, 2013 Share Posted April 21, 2013 Cramming more into the STI tube, it pushes the brass into the stiffening rib on the side of the tube. Does it do it if you don't try to get max rounds in the tube? SVI tubes have no stiffening rib.... Link to comment Share on other sites More sharing options...
Koppi Posted April 21, 2013 Share Posted April 21, 2013 Try squeezing your mag front to back a few 1,000's to widen it out. post how it goes Link to comment Share on other sites More sharing options...
chirpy Posted April 21, 2013 Share Posted April 21, 2013 What does STI say? Richard Link to comment Share on other sites More sharing options...
jimbullet Posted April 22, 2013 Author Share Posted April 22, 2013 If I load 14 rounds, which is the factory setting, the rounds dont get crimped but if I load it full 17 rounds, some rounds get crimped. I can imagine what STI will say, and that their mags are built for 14 rounds really. Link to comment Share on other sites More sharing options...
jimbullet Posted April 22, 2013 Author Share Posted April 22, 2013 Try squeezing your mag front to back a few 1,000's to widen it out. post how it goes Im not extremely confident to do this as it sounds like a hit and miss. If its a ribs, should I be filing that away? Link to comment Share on other sites More sharing options...
tbarker13 Posted April 23, 2013 Share Posted April 23, 2013 Experienced the same problems when using 40 cal Bayou Bullets with the cannelure. I noticed it was more severe with the last few rounds that I was squeezing into the mag. My guess was that it was caused by the rim of the bullet being loaded - as it passed over the bullet beneath it. I also wondered if the UPULA loader was causing it as it pressed the round down into the mag tube. Never seemed to have an impact on reliability, etc. Link to comment Share on other sites More sharing options...
bull2700 Posted April 23, 2013 Share Posted April 23, 2013 Normal with no lube in the lube groove. Link to comment Share on other sites More sharing options...
jimbullet Posted April 23, 2013 Author Share Posted April 23, 2013 Normal with no lube in the lube groove. Could you elaborate please? Do you mean I should put some lube, i.e. break free inside the mags, particularly on the ribs? Link to comment Share on other sites More sharing options...
BASE772 Posted April 23, 2013 Share Posted April 23, 2013 (edited) Normal with no lube in the lube groove. Could you elaborate please? Do you mean I should put some lube, i.e. break free inside the mags, particularly on the ribs? He means that there is no bullet lube in the lube groove. Only the bare lead bullets have it and not the coated lead. I wish more manufactures had non-grooved bullets. IMO the perfect coated lead bullet would be the Precision 185 gr with the Bayou coating. Sorry, off topic. Edited April 23, 2013 by BASE772 Link to comment Share on other sites More sharing options...
Steve RA Posted April 23, 2013 Share Posted April 23, 2013 Don't thing it will hurt anything, plus, it would certainly slow down any bullet setback during the loading process ! Link to comment Share on other sites More sharing options...
BASE772 Posted April 24, 2013 Share Posted April 24, 2013 Don't thing it will hurt anything, plus, it would certainly slow down any bullet setback during the loading process ! That is true. Link to comment Share on other sites More sharing options...
jimbullet Posted April 25, 2013 Author Share Posted April 25, 2013 Thanks. I suppose as long as it doesn't affect it's operation. Link to comment Share on other sites More sharing options...
Th3Un4givin Posted May 2, 2013 Share Posted May 2, 2013 I have noticed the same thing, I just contributed it to creaming the last couple of rounds in my mags. I haven't noticed any adverse affects tho. Link to comment Share on other sites More sharing options...
Blue Jacket Posted May 22, 2013 Share Posted May 22, 2013 (edited) I just got my STI untuned 140 mag tube, grams follower and Dawson SNL base. Mine is doing the same thing, I can get 20 in it though. However, I compared the spring length to the Dawson tuned I got with my Eagle and the Dawson is about 1.5 coils shorter. And it was with Bayou Bullets as well. Think there might be too much spring tension and it's being pressed into the rib on the side of the mag? And I was going to pull my bent ones, looks like at least I can fire them. I do still need to trim the follower so the slide wont lock. I purchased this as my learn how to set up mags as I didn't want to screw up a tuned one, and I figured it would be good to have a 5th mag for a spare anyways. Edited May 22, 2013 by Blue Jacket Link to comment Share on other sites More sharing options...
Pat Miles Posted May 22, 2013 Share Posted May 22, 2013 I would be VERY, VERY careful about shooting those "crimped" rounds. With that situation you are very probably building some hellacious pressure before that bullet escapes the brass. I would seriously suggest you pull those rounds apart, $hitcan them and find the cause of the problem and fix it. Pat Link to comment Share on other sites More sharing options...
Th3Un4givin Posted May 22, 2013 Share Posted May 22, 2013 Wouldn't a rise in pressure from the bent case be reflected in chrono results? Link to comment Share on other sites More sharing options...
Pat Miles Posted May 23, 2013 Share Posted May 23, 2013 Yes, it should show a rise in velocity but you might jusr get a catastrophic rise in chamber pressure just before the bullet travels through the chrono screens. Just suggesting caution. Pat Link to comment Share on other sites More sharing options...
JaeOne3345 Posted May 23, 2013 Share Posted May 23, 2013 The spot that gets dented is not an area where the powder sits. I highly doubt it affects the case volume. As said above, it sits in the lube ring. I notice it when I dump my rounds out between stages and brush my mags. I reload/shoot the same cartridges without an issue on the next stage. Link to comment Share on other sites More sharing options...
bigcraig Posted May 27, 2013 Share Posted May 27, 2013 Normal with no lube in the lube groove. Could you elaborate please? Do you mean I should put some lube, i.e. break free inside the mags, particularly on the ribs? He means that there is no bullet lube in the lube groove. Only the bare lead bullets have it and not the coated lead. I wish more manufactures had non-grooved bullets. IMO the perfect coated lead bullet would be the Precision 185 gr with the Bayou coating. Sorry, off topic. I agree, there is NO reason why a moly coated bullet needs a lube ring. I also agree that a 180 or 185 Bayou bullet with no lube ring would be perfect. Link to comment Share on other sites More sharing options...
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