If you are going to handload rifle ammo, be sure to always use a proper CASE GAGE that allows you to accurately reproduce the
BASE-TO-SHOULDER dimension of your resized case.
Correct base-to-shoulder dimension will ensure that your handloads are the same dimension in that regard as FACTORY AMMO. Failure to do this is the most common overlooked IMPORTANT ELEMENT of handloading bottleneck rifle cartridges. If you botch this, you will have much grief. If this dimension is wrong, you will have ammo that won't go fully into battery, or you will have head-separations, or you will have primers that back out of the primer-pocket on firing.
Get this dimension right.
Go real easy on the crimp - or better yet, omit the crimp altogether to avoid collapsing the shoulder of your case. If you can press the bullet of one of your handloaded rounds against your gun safe with one hand, and moderate pressure, and the bullet doesn't move back into the case, that's
ENOUGH NECK TENSION. Usually neck-tension alone - with no crimp whatsoever - will pass this test.
TAC powder all things.
TAC is widely available, not overpriced, and it works GREAT in virtually any common centerfire cartridge.
Maybe not ideal for .22 Cheetah or .416 Rigby. But real good for almost any NORMAL caliber in-between.
https://ramshot.com/wp-content/uploads/2020/08/WesternPowdersHandloadingGuide8.0_WEB.pdf
150 grain bullet - whichever one suits you. Everyone seems to have a favorite. As a practical matter, it doesn't matter much.
Rest assured, ANY .308 or 30-06 bullet you put through the thoracic cavity of any North American animal will result in the swift death of that animal. While there are "African cartridges" that bwana's use for hunting dangerous game in Africa, I'm pretty sure African game wardens are using .308 FMJ to cull animals as large as elephant when making "administrative" kills. Shot placement matters.
44 grains TAC for .308
48 grains TAC for 30-06
Consider that Ramshot fired these loads through some really long "test barrel."
You won't get the claimed velocities from most hunting rifles - just like the velocities Remington publishes on their boxes and website aren't what you'll get either from your hunting rifle.
I think the chamber-pressure Ramshot lists is about right for the respective bullet-weight/powder-charge.
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