MoonJeong Posted February 17, 2015 Share Posted February 17, 2015 Ok. So we all know that played bullets should not be crimped. I discovered something amazing today. The case bell is the ultimate differentiator. I did 50 rounds with the case mouth belled to .391 and 50 rounds belled to .371. What did I find? With jacked bullets, no difference. With plated bullets, I did 10 5 shot groups at both bell sizes. Load at 170 of with extreme 115 and 124 hps... The .371 bells had an average group size of about 3 inches with 1 or 2 fliers that opens the groups beyond 5 inches. The .391 bells had 10 5 shot groups that averaged 2 inches... Not a single flyer out of the 50 rounds! Crimp was at .3775 on the average. All these months trying to understand why sometimes I had accurate played loads and sometimes horrible. Now I know: no crimp and case mouth bell to .391. The hypothesis is that opening the case mouth more minimizes played bullet damage while seating. Pretty simple. Same hypothesis of crimp damaging the played bullets. Give it a try and let me know if this is the case in other guns also. Link to comment Share on other sites More sharing options...
Sarge Posted February 17, 2015 Share Posted February 17, 2015 Belled to .371? Crimp on a 9mm should be in the .376-.379 range. That's way too small of a bell. Link to comment Share on other sites More sharing options...
MoonJeong Posted February 17, 2015 Author Share Posted February 17, 2015 Sorry mistyped. .381 bell produces wild groups. Crimp at .3775. Link to comment Share on other sites More sharing options...
Sarge Posted February 17, 2015 Share Posted February 17, 2015 Yeas that makes much more sense. Link to comment Share on other sites More sharing options...
MoonJeong Posted February 17, 2015 Author Share Posted February 17, 2015 By the way, Sarge is right, .381 is the absolute minimum bell to which bullets will stay in case as it goes up the seater. Also .391 is kind of a max. Link to comment Share on other sites More sharing options...
Baer45 Posted February 17, 2015 Share Posted February 17, 2015 After ready Vol 1 of Patrick Sweeney's "Book of the 1911" which better explained reloading pistol rounds the any other reloading book (including his) I have always set my crimp for plated bullets at .378 or slightly less depending on brand. Accuracy jumped. Good read and highly recommend. Forget the next volumes as all the good stuff is in one unless you enjoy seeing reviews of new guns....c Marine Corp Colonial Shooting Academy Link to comment Share on other sites More sharing options...
Baer45 Posted February 17, 2015 Share Posted February 17, 2015 Yeas that makes much more sense. Sarge - is the crimp for 9mm the same as for 38 Super? Bullets are .356 Marine Corp Colonial Shooting Academy Link to comment Share on other sites More sharing options...
gng4life Posted February 17, 2015 Share Posted February 17, 2015 (edited) 9mm and 38Super should be crimped to the same diameter. The average case wall is .010 so take the bullet diameter, add the case walls, and you come out to somewhere around .375-.378. Sent from the range Edited February 17, 2015 by gng4life Link to comment Share on other sites More sharing options...
MrPostman Posted February 22, 2015 Share Posted February 22, 2015 I have had great luck with xtreme bullets I highly recommend them. Link to comment Share on other sites More sharing options...
Garrett Posted March 2, 2015 Share Posted March 2, 2015 I've had mixed results with Xtreme. The .355" are marginal at best in most of my guns, but their .356" are okay. For roughly the same price, I seem to get better results from Berrys. Link to comment Share on other sites More sharing options...
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