- Joined
- Oct 31, 2012
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So I have a GM fast twist barrel 1-28. I've been trying the .503 460grn No excuses conical. I've shot them at 80 grns of fffg goex and a hard card. grouping is not very good. Should they be pushed faster may be closer to 90grn or slower more toward 70grns. trying to decide which way to go on the next range session. Thx.