Sometimes a roll crimp won't tighten enough to hold the bullet tight. I use Lee Carbide Factory Crimp Dies to make sure they stay tight in the brass. You can get one for around $15 at MidwayUSA. I've started using them on just about everything I reload. http://www.midwayusa.com/viewProduct...tNumber=217484
EDIT: Corrected the URL
USAF Retired, CATM, SC CWP, NH NR CWP, NRA Benefactor
To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike, especially when young, how to use them... -- Richard Henry Lee, 1787