Crimping for 30-06/Remington 7600?

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gps

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Scugog, ON
My Lyman reloading manual says that all 30-06 cartridges for use in pump and semi-auto guns (as well as 30-30 cartridges to be used in guns with tubular magazines) must be crimped.

The 30-30 reasoning makes sense to me but why a pump 30-06 like the Remington 7600? The cartridges go through all of the same motions as any bolt-action rifle; they get stacked one on top of another in a vertical magazine, are chambered and extracted by a similar bolt, etc. Recoil is the same.

What's the difference?
 
I've owned several pumps from .223 to 35Whelen and loaded for them all. Never did see a need for crimping, so I never did.

BTW .... all worked fine with reg FLR dies. Small base not required.


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I started off crimping all my hand loads for my 7600's. I used the Lee factory crimp die.
I don't always use the mag when at the range and often just single feed. I havent bothered with the crimp for a while and unless I can find an accuracy benefit I may not bother.

My manuals also state that it is necessary to full length re size casings for semi autos and pumps. I neck size for my .243 7600 and only partially size for the .308. They both cycle and feed the rounds without problems.
 
I think it may depend on which bullet you intend to load and how tight your necks are. If you're using 150's and your expander is on the small side, you may not need it. If we're talking 180 or 200 grainers and your expander is on the thicker side then you may have an issue. I can tell you that with my 7600 in '06 that if I try to seat the bullets close to the lands they end up close enough to have tip deformation from the magazine from recoil. I DO crimp mine for that reason and have found a modest increase in accuracy as an added bonus.
 
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