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I have Mod 600 Rem in .243. Trying to make a little better deer rifle for my son by using 105 gr bullets. Could not get a decent group at 100 yds. Measured the twist thinking for the past 40 plus years the gun had a 1:9.25 twist. It has 1:10 so this is probably why I am proving to be a bad shot with these bullets. Ran it through the Greenhill formula and it calculates needing 8:1 ish. Anyone have any input or support on this?