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Catfish,
Regards accuracy at 100 VS better at longer range. I was developing a new silhouette cartridge a while back and had a problem with stability at my inital testing distance of 50 meters. I was getting slightly elongated holes at 50 and round holes at 100 and over. So I called Sierra and talked to one of the engineers about the situation.
What I was told was that the boat tail design requires a vacum to form over the base to fully stabalize the bullet in flight. For some designs, the distance to stabalize the bullet can be just over 100 meters. Apparently the smaller the base in the boattail, the longer it takes to stabalize.
Ed
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