I just used an OAL guage to measure the depth I should seat my bullets. The bullet I am wanting to try is a hornady SST 100gr. (actually 95 gr). The bullet has a cannelure on it but I will have to crimp below that to get the bullet to rest on the lands or within .03 of the lands as recomended by the OAL guage. I was trying to improve the accuracy of the rifle and try a new bullet. I know bullets can be crimped if they don't have the cannelures just lightly. I will be using a bolt action rifle.