You would use a roll crimp only if the bullet you're loading has a cannelure (a slight depression around the middle of the bullet). Other than that, you would use a taper crimp.
I load 30/06 for an M1, and buy the bullets with a cannelure in order to make sure that I don't knock a bullet back into the case when firing. In a bolt gun, I doubt you would need to do this, but you could. On my .45 ACP, 40 *&*, 9x23 and 9x18 Mak, I use a taper crimp. Seems to be a rule of thumb that in a semi-auto or in a heavy recoiling revolver, you should taper crimp.
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