Have a new dpms 243 upper and will be reloading for it. Do you guys suggest a crimp on the bullet seating? Thanks for looking.
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Crimp or no crimp
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Re: Crimp or no crimp
Load up an entire mag with your handloads and fire all but the last, allowing it to chamber. Extract the round and measure its OAL. If it's the same as when it went into the mag you're GTG.
Greg
Load up an entire mag with your handloads and fire all but the last, allowing it to chamber. Extract the round and measure its OAL. If it's the same as when it went into the mag you're GTG.
Greg
Re: Crimp or no crimp
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Greg Langelius *</div><div class="ubbcode-body">Load up an entire mag with your handloads and fire all but the last, allowing it to chamber. Extract the round and measure its OAL. If it's the same as when it went into the mag you're GTG.
Greg </div></div>
Greg, that is why they keep you around here. I always learn something new from the "Resident Old Fart." I am going to do that the next time I shoot my Semi.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Greg Langelius *</div><div class="ubbcode-body">Load up an entire mag with your handloads and fire all but the last, allowing it to chamber. Extract the round and measure its OAL. If it's the same as when it went into the mag you're GTG.
Greg </div></div>
Greg, that is why they keep you around here. I always learn something new from the "Resident Old Fart." I am going to do that the next time I shoot my Semi.
Re: Crimp or no crimp
I'm loading for a DPMS 308 also and never have crimped only have around 100 rounds or so with it. Shooting 168 Sierra HPBT and never had a problem without crimping. I know 100 plus rounds is not much but when I go hunting my gun goes through hell. I bought mine to function and work and never fails me
I'm loading for a DPMS 308 also and never have crimped only have around 100 rounds or so with it. Shooting 168 Sierra HPBT and never had a problem without crimping. I know 100 plus rounds is not much but when I go hunting my gun goes through hell. I bought mine to function and work and never fails me
Re: Crimp or no crimp
I don't crimp for my .260 upper. I use redding dies so just load a dummy round chamber and see if it slides out or not. I adjust bushings till I find the lightest neck tension that works. Same goes for my .308 upper and my M1, M1A, and M1 Carbine. Never had a problem.
I don't crimp for my .260 upper. I use redding dies so just load a dummy round chamber and see if it slides out or not. I adjust bushings till I find the lightest neck tension that works. Same goes for my .308 upper and my M1, M1A, and M1 Carbine. Never had a problem.
Re: Crimp or no crimp
First off if you are shooting 168 Sierras unless something has changed there is no cannelure (crimp groove) in bullet so crimping will deform bearing surface of bullet.
Unless you have a very light bullet grip on purpose you should be able to feed just fine.
First off if you are shooting 168 Sierras unless something has changed there is no cannelure (crimp groove) in bullet so crimping will deform bearing surface of bullet.
Unless you have a very light bullet grip on purpose you should be able to feed just fine.
Re: Crimp or no crimp
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hummer</div><div class="ubbcode-body">First off if you are shooting 168 Sierras unless something has changed there is no cannelure (crimp groove) in bullet so crimping will deform bearing surface of bullet.
Unless you have a very light bullet grip on purpose you should be able to feed just fine. </div></div>
I didn't mean I can crimp them. I purposely started with no crimp bullets to try it out and haven't had any problem with no crimps.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hummer</div><div class="ubbcode-body">First off if you are shooting 168 Sierras unless something has changed there is no cannelure (crimp groove) in bullet so crimping will deform bearing surface of bullet.
Unless you have a very light bullet grip on purpose you should be able to feed just fine. </div></div>
I didn't mean I can crimp them. I purposely started with no crimp bullets to try it out and haven't had any problem with no crimps.
Re: Crimp or no crimp
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: longrange30</div><div class="ubbcode-body">I never, ever crimp for any of my AR-Platforms.</div></div>
....i hope you wear a cup
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: longrange30</div><div class="ubbcode-body">I never, ever crimp for any of my AR-Platforms.</div></div>
....i hope you wear a cup
Re: Crimp or no crimp
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: longrange30</div><div class="ubbcode-body">I never, ever crimp for any of my AR-Platforms. </div></div>
One needn't be a physicist to understand that the inertia of a 139, 168, or 175 grain bullet is significantly more that that of a 55 or 62 grain .224" bullet. What one may get away with in a 5.56 cartridge may not apply to a larger cartridge.
While Greg and Bolt offer sound advice or rib pokes, respectively, there are two types of crimps one may apply: A taper crimp or a roll crimp. You never roll crimp a case onto a "clean" bullet. You may taper crimp to one though as well as a cannelured bullet.
Much like the youtube video in the current annealing thread, there are a lot of people entirely too willing to persuade others of the soundness of their reloading practices. Practices that may be dangerous as hell but they have gotten away with.
Personally, I crimp for the gas guns, pistols, revolvers and leverguns and don't for the bolt guns.
I'd also spend some time reading some reloading manuals on the subject.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: longrange30</div><div class="ubbcode-body">I never, ever crimp for any of my AR-Platforms. </div></div>
One needn't be a physicist to understand that the inertia of a 139, 168, or 175 grain bullet is significantly more that that of a 55 or 62 grain .224" bullet. What one may get away with in a 5.56 cartridge may not apply to a larger cartridge.
While Greg and Bolt offer sound advice or rib pokes, respectively, there are two types of crimps one may apply: A taper crimp or a roll crimp. You never roll crimp a case onto a "clean" bullet. You may taper crimp to one though as well as a cannelured bullet.
Much like the youtube video in the current annealing thread, there are a lot of people entirely too willing to persuade others of the soundness of their reloading practices. Practices that may be dangerous as hell but they have gotten away with.
Personally, I crimp for the gas guns, pistols, revolvers and leverguns and don't for the bolt guns.
I'd also spend some time reading some reloading manuals on the subject.
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