TRUbor9 Posted July 30, 2011 Share Posted July 30, 2011 I was just curious to see what most people have thier crimp set at. Link to comment Share on other sites More sharing options...
Sarge Posted July 30, 2011 Share Posted July 30, 2011 same as all my 9mm stuff .377. Link to comment Share on other sites More sharing options...
markcic Posted July 30, 2011 Share Posted July 30, 2011 2x brass wall thickness + bullet diameter. Link to comment Share on other sites More sharing options...
al503 Posted July 31, 2011 Share Posted July 31, 2011 After you seat the bullet, measure the diameter of the case below the flare. Crimp to within +- .001" of that diameter and call it good. Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2011 Share Posted July 31, 2011 After you seat the bullet, measure the diameter of the case below the flare. Crimp to within +- .001" of that diameter and call it good. That is pretty tough to do with a Udie. Link to comment Share on other sites More sharing options...
al503 Posted July 31, 2011 Share Posted July 31, 2011 After you seat the bullet, measure the diameter of the case below the flare. Crimp to within +- .001" of that diameter and call it good. That is pretty tough to do with a Udie. Not sure what you mean but it shouldn't matter what sizing die you use. Seating the bullet will expand the case to the diameter you need. Measure the case right below the flare where the base of the bullet is. Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2011 Share Posted July 31, 2011 I guess I still don't get it. Thats why I don't do a bunch of arithmetic. I just know a pretty good number for 9mm is .376-.377. I just adjust for that target and push a few against the bench to make sure they stayed tight. Link to comment Share on other sites More sharing options...
al503 Posted July 31, 2011 Share Posted July 31, 2011 I guess I still don't get it. Thats why I don't do a bunch of arithmetic. I just know a pretty good number for 9mm is .376-.377. I just adjust for that target and push a few against the bench to make sure they stayed tight. That's the beauty of this, Sarge. You don't have to do any math. Measure the diameter of the base of the bullet inside the case after seating and before crimping. Adjust your crimp die until you get within .001" of that first measurement. (On jacketed, I usually shoot for the same diameter. For moly, I shoot for +.001" so you don't cut into the cover.) No add this to this and divide by 2. Link to comment Share on other sites More sharing options...
Sarge Posted July 31, 2011 Share Posted July 31, 2011 And let me guess. You are in the neighborhood of .376 give or take? Link to comment Share on other sites More sharing options...
MoNsTeR Posted July 31, 2011 Share Posted July 31, 2011 Mine measures about 0.377", but when setting it I don't measure I just eyeball. Link to comment Share on other sites More sharing options...
Aircooled6racer Posted July 31, 2011 Share Posted July 31, 2011 Hello: I seat the bullet with the crimp. I then measure down 1/8" from the mouth and write that dimension down. I then measure the case mouth right at the top and make it 0.002" smaller. Different brass has different wall thickness so that is why I do it this way. It works for moly coated as well as jacketed bullets. Hope this helps. Thanks, Eric Link to comment Share on other sites More sharing options...
JThompson Posted July 31, 2011 Share Posted July 31, 2011 I just take out the bell.... eyeball the deal and call it good. I've prob made 300K that way with never an issue. Then again my gun will run anything... JT Link to comment Share on other sites More sharing options...
Foxbat Posted August 4, 2011 Share Posted August 4, 2011 I just take out the bell.... eyeball the deal and call it good. I've prob made 300K that way with never an issue. Then again my gun will run anything... JT Same here. I set it by eyeballing till I see very small amount of chamfer on the case mouth. However, this can be gun-specific. One of my open guns in 38SC required a lot more crimp - haven't seen such a problem with 9mm. Link to comment Share on other sites More sharing options...
freakshow10mm Posted August 4, 2011 Share Posted August 4, 2011 All my 9mm is loaded to .375" crimp. Link to comment Share on other sites More sharing options...
Glockcomma Posted August 4, 2011 Share Posted August 4, 2011 Been crimping .378 for years never had a problem. Link to comment Share on other sites More sharing options...
noypi916 Posted August 12, 2011 Share Posted August 12, 2011 Will a tight crimp really make a bullet to tumble in open 9mm major? Link to comment Share on other sites More sharing options...
Sarge Posted August 12, 2011 Share Posted August 12, 2011 Will a tight crimp really make a bullet to tumble in open 9mm major? Not that I'm aware of. Link to comment Share on other sites More sharing options...
OpenDot Posted August 12, 2011 Share Posted August 12, 2011 .375 Link to comment Share on other sites More sharing options...
OpenDot Posted August 12, 2011 Share Posted August 12, 2011 Will a tight crimp really make a bullet to tumble in open 9mm major? Depends on Barrel twist and bullet weight Link to comment Share on other sites More sharing options...
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