Since today is 6/8 here's a GURPS: Gun Stats comparison for some .277 cartridges!
6.8x43mm SPC lobbing an SSA 115 SMK at 2,550 fps from a 16" barrel does 6d-1 pi out to 760/3,200
6.8x51mm XM1168 sending a 113gr AP round at 3,000 fps from a 13" barrel does 4d+2(2) pi- out to 970/4,100.
.277 Fury brass case popping a 135gr "elite match grade FMJ" at 2,750 fps from a 16" barrel does 6d+2 pi out to 1,190/5,000.
.277 Fury hybrid case squirting a 135gr SMK at 3,000 fps from a 16" barrel does 7d+1 pi out to 1,300/5,500.
.270 Winchester Short Magnum flinging a 130gr polymer tip copper round at 3,280 fps from a 24" barrel does 8d-1(0.5) pi+ out to 1,200/5,000.
.270 Winchester firing Federal Premium VitaShok 130gr Trophy Bonded at 3,060 fps from a 24" barrel does 7d+1(0.5) pi+ out to 1,150/4,800.
.270 Weatherby Magnum blasting a 130gr polymer tip copper round at 3,400 fps from a 26" barrel does 8d(0.5) pi+ out to 1,250/5,300.

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