After reading the bullberry test on barrel lenght for the 204, and Fred concluding that you only loose 50 fps going from 24 to 21". I chopped my Cooper 204 down to 21"
Sierra 39's were doing 3950-4000fps with 28.3g of H4985 Extreme (AR2206h) out of the factory 24" bbl.
Same load is now only doing 3650-3700!, so I have lost more like 200fps!@#$
Cheers
Grant
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