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The Kilwell Whispers were 37.5gr but I think now they (ah Winchester) have changed the brew, and the packet colour, to 40gr subs. I am told they don't shoot as well as the old ones. I managed to pick...

CCI rate their Standard Velocity round @ 1070 fps whilst their Sub-Sonics are 1050 fps - virtually the same. Speed of Sound is generally 1127 fps so they both should be well short of that. I use both...