I seat and crimp in same step using Lee dies and here's a finished 115 gr FMJ. Notice the sharp square of case mouth to headspace with chamber and even case bulging around the bullet base to indicate good neck tension that produces no bullet setback.Looks like your crimping and seating in the same die.
So I am doing something wrong?Seat and crimp using separate dies.
I seat and crimp in same step using Lee dies
started reloading with a Hornady LNL AP ... I purchased ... a set of RCBS dies for 9mm
Looks like your crimping and seating in the same die
Seat and crimp using separate dies.
Every so often I get a case that looks like this. Is there something wrong with one of the does (seating), or is it just the case that ended up that way after firing?
Very good point.You can do it in 1 step.
Try to set the crimp using a piece of brass that is longer than your average length. This way when a long one comes through it does not cause the same problem.
This would occur if you were applying too much crimp.If the case length is a little too long and you try to seat and crimp in one step, you are trying to push the bullet deeper while the die body is already trying to crimp the case mouth.
Try to set the crimp using a piece of brass that is longer than your average length.
No, since OP is using a lot of crimp, using longer resized case to set the die would help not apply even more crimp.Hey Blue, don't you mean shorter than the average length? I find the shortest one I can find to set up with, that way I know I am removing 100% of the flare on all of them.
Excellent point. The problem with 9mm brass is that it is SO close to 380. I've had two instances where after I finished reloading a cartridge, I noticed it was a 380 case. I reloaded it with no issues, only upon visual inspection did I notice the actual bullet seemed much longer than my other reloads. They also weigh less, so since starting reloading with the Hornady LnL, I weight each case and make sure it is within a specific range.The good thing about 9mm is that there is so much laying around there is usually no problem coming home with more 9mm brass than you shoot. The problem with 9mm is the dimensions are all over the map. If the case length is a little too long and you try to seat and crimp in one step, you are trying to push the bullet deeper while the die body is already trying to crimp the case mouth. The LnL AP has 5 stations so there is adequate room to have both a case expansion die, seat die and a crimp die. I use the Lee taper crimp die to close the bell on my 9mm cases after seating. No need to get the case mouth much further than vertical to ensure it feeds smoothly and headspaces properly.
Wow, that's a lot of work.They also weigh less, so since starting reloading with the Hornady LnL, I weight each case and make sure it is within a specific range.