Brocock/BRK Ghost collaborative data request

I've tried several pellets at different weights for my .30 caliber 600mm barrel. None are grouping well. Either my Athlon Heras 6-24x50 is garbage or it's something else.
I cleaned my barrel and did a light polish job on it. My reg is at 144 and wheel at 14....Mine loves the AEA 50.5 right at 900 FPS.

Tony P.
 
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