If you want to extract the full potential from the 6.5x55 in modern actions N560 is probably the top of the heap.
I use N560 and Norma cases. 139 grn Amax.
2840fps from 21.5" barrel and consistently small groups.
The down side is that N560 is a bit expensive.
For modern rifles start 140 grain projectiles at around 46 grains N560 and creep up. It works with 120 grn Nosler BT too. Expect 2900fps plus from 120grn.
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