I got talking to 2 different target shooters at last years Sika show, they both shot 260 rem, they both told me that 210's were too hot for the 260 rem, and to use cci 200's or br2's.
Ive just tested cci 200's back to back with 210's that i had previously used. The 200's shot far tighter groups. Im sold. H414 powder.
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