you re pushing too fast that bullet ...

Originally Posted by CZfan

Gun: CZ 550 medium lux 9.3X62, 60 sm barrel.
Temp.: 7 ℃ degree celsius
wind: 1.5m/s
Sun

bullet-Hornady interlock - 286gr
brass-RWS
powder - Ramshot BigGame-65grain
Primer: CCI 250
COL-3.366

av. Vo = 2543 fps/ 775 m/s
No sign of over pressure.
Moa groups
My barrel like this Hornady interlock - 286gr.