I use 7.5 gr. Tinstar with a lead 200 gr. Bullet to get a little over 1000 fps. And 9.3 gr tinstar to get a 200 gr. Plated bullet to the same speed. I also use 22 grains n110 with the plated bullet to get 1800 fps in my marlin. I wouldn't hesitate to try a bit more than that in 4227 to get the same speed