Ive never owned a 6.5x55AI and personally not a fan of long actions but a few F class shooters run that cal. There is one for sale on trademe now. It is much like the 260rem and 260 AI.. likes slow powders and long barrels. The .260 has the edge IMO as it has better small rifle primer match brass available so can cope with higher pressure loads without burning out brass/primer pockets.
Take a look at 6.5x55 in any reloading manual and you will see its max velocities come from slow powders and they are still nothing amazing.
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