I've used 12-13 grains of Unique, 150gr FMJBT, in 7.5 Swiss (roughly same as the 308 Win). Got 1" 6-shot groups at 50 yards with a 4X weaver scope. Recoil like a .22lr.
I've gone as low as 8 grains and 115 grain lead bullets in 303 Brit with decent results.
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