500 grs and Dean- See I musta done it wrong. I fired off three shots in about a minute. HURT LIKE HELL! I shoulda waited 10 minutes between shots!
Dean- You need a 12 inch drop tube to get 165 grs of IMR 7828 into the .600 OK cases. To get above that level you need to go to H414. Try starting with 156 grs of IMR7828 and working up.Depending on the design of your break and the number of mercury recoil reducers you put in the stock and your recoil tolerance will determine max velocity for you. I,ve been to 2400fps with a 900 gr Bridger and I alsmost can't hold on to the rifle because of the torque. Work up slowly to this level and wear a Past recoil pad! You can achieve a level of recoil with this gun which literally may break bones if you lose control! I frankly think you will be very very happy even at 1950fps.I have to send you the plastic water bottle video of the .600 Ok in action!-Rob