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Use a similar powder and charge weight with the 255 as you do with the 240 XTP. Back down a full 2 grains to start. Right around 20 grains of 2400 works good for me. I go as high as 22.5 if I want a stomper. But: Over 20 grains is above current published maximums. Approach with caution and use at your own risk! Niether TFL or it's staff is responsible for your actions.
As for the 300 grainer, I use around 20 grains of 296. Start lower by a couple grains and work up to it slowly. This load is right at current published maximums.
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From my cold dead hands.........
NRA certified rifle, pistol and shotgun instructor.
Hunter education instructor
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