What?
That a 6.5x55 shooting a 140gn projectile with ADI 2209 through a 18.5" barrel might only be doing 2200fps, going to a faster powder away than the 2209 burn rate is not ideal for the cartridge.
Versus a 260, which could use a faster powder such as 2206H for the 140gns, so you could go with a shorter barrel and make up for lost velocity with tweaking the loads more.
Seems pretty basic to me.
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