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Speer Grand Slam Bullets
hadjii
Member Posts: 976 ✭✭
Anyone have any experience using these bullets? Anybody have anybody have a pet load for the 120 gr. Grand Slam in 257 Roberts? So far, these bullets have my stumped. I've tried IMR 4350, H4895, IMR 3031, and IMR 4831, and can't get these bullets to group inside 3" for anything. I've tried varying the OAL as well, but can't seem to find the secret recipe. The same gun will group 117 Sierra's at about 1 1/4" regularly, but I've heard enough about the Sierra bullets blowing apart on impact, that I want to try something a little better.
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