I crimp everything too, just eliminates worry for me. Dyjital said:. Staff Member. Messages 10, Reactions 40, Messages 2, Reactions 4, I reload thousands of annually for Competition shooting AR rifles. Never crimp no issues with bullets being pushed back. I use standard full length RCBS sizer die. No canular SMK bullets. Several times I have done an experiment load two batches ten rounds each identical loads except for crimp and no crimp. The no crimp batch has always produced considerably tighter groups.
I am looking for the most accurate round I can produce. Proof is in the results. A match I shot last weekend I did a X at yards. Tied by personnel best score. I do notice more consistency from even crimping as opposed to none. Dozer99 Bryant Mt, Oregon. So, here is what we have learned from this thread- It's your choice! Greenbug Bend. Messages 2, Reactions 2, Crimping introduces another variable, question is, does this new variable erase previous inconsistencies or introduce new ones?
No crimping for me if I am looking for consistency. I always adjust the die for a slight crimp when loading No extra effort really and my results are consistent and reliable. If your running a progressive and have the die and your not looking for accuracy then why not?
Reno 7up yours. Messages 13, Reactions 29, One bullet in a weaker necked casing is all it takes. Ironically with factory ammo as well as reloads. One of the times I saw it we caught it, the first time was a catastrophic failure. Not a good thing for the rifle afterwards. Therefore I crimp semi auto reloads using a Lee Factory crimp.
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Reloading Supply Classifieds. Ammunition Classifieds. Smith and Wesson 2. Glock Fourth Generation. Support Northwest Firearms If our Supporting Vendors don't have what you're looking for, click these links before shopping and Northwest Firearms will receive a portion of the sale. Aero Precision. Short cases will not get much crimp, long cases will get too much crimp and the neck can get buckled, causing chambering issues. I use a Lee FC factory crimp die for crimping. Added bonus, case length is not critical for crimping.
Bullet Crimps, Why? The rifle bullet I'm loading has a crimp groove, but the cartridge length recommended puts the groove out of the case. Should I change the seating length to make the crimp groove line up. Not all rifle cartridges require crimping. The groove on the bullet is positioned for those that need the crimp. If the recommended seating length puts the crimp groove above or below the case mouth, we determined that crimping was not needed.
Having the crimp groove above or below the case mouth has no adverse effects on accuracy or performance. I'm reloading ammo for my lever-action rifle. Do I need to crimp the bullets. Yes, crimping is mandatory for ammo to be used in any rifle with a tubular magazine. The pressure of the magazine spring and the vibration of recoil can cause the bullet to "telescope" into the case, resulting in poor feeding and increased pressure. When loading for a tubular magazine rifle, always select a bullet with a crimp groove, and one that has a flat point to prevent in-magazine firing.
Speer never made such a broad recommendation. We express ours thanks to the die maker for allowing us to make contact with so many new SPEER customers. Taken from The military specs a crimp for the reasons of: Prevention of bullet set back and uniformity. They don't want bullets that will telescope back into a case and cause a jam or overpressure condition. Not, to mention that the ammo goes through a lot of "abuse.
For a new re-loader If the bullet has a cannelure IF the bullet doesn't The 2nd die in the standard two die rifle set will allow you to "dial in" the amount of crimp or no crimp at all. It's in how you make the adjustment. Once you have more experience And, try experimenting a little with COAL. Just my. Aloha, Mark. Mark each case by using a sharpie type marker, marking on the back or side of each case. Use different marking techniques for each case, example us a straight line on the back of one, on the other make a cross and on the last draw a circle, or you can number them 1, 2 and 3.
It is import to have the exact measurement for each case prior to conducting this test. The last thing to do is to load them into the bottom of your magazine but you do not necessarily need to top the magazines off.
The goal here is to shoot several rounds with these marked rounds in the bottom of the magazine and not to shoot these three rounds. Remove the rounds from the magazine and measure again. They should be the exact same size OAL before being fired in the mag.
If the vibration of shooting your rifle causes the rounds to get shorter or longer when in the magazine you need to crimp. In the test I conducted I found not only did I need to crimp but they needed to crimp tighter than I originally though. I use to be one of those who never crimped but now I am a believer in the importance of this little step.
I have loaded and shot both crimped and non crimped through my AR. Accuracy was the same as well as rifle function. I put a slight crimp on my rounds simply because it gives me a little more confidence in my reloads. Once you become good at controlling every variable of the processes, try incorporating it into a build. There are three options: 1 Don't crimp. The neck sizing makes the case neck just tight enough, and the brass is elastic enough, that when the bullet is seated there is tension holding the bullet in place.
This is certainly fine for bolt actions, single shots, in which you control how the round is fed into the chamber.
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