The rifle used to develope the loads in this chart was built on a Remington 788 action, in a factory stock. The barrel is from a Winchester .243 Varmint that has been rechambered to 6mmAI, and with a .267" neck. The trigger is factory, but tuned down to 2 1/4 lbs. Scope is a Tasco 8-32 TS. He turns the necks down to .011", leaving a loaded round diameter of .265". Bullets are loaded to touch the rifling. The fireforming load is 48.5 grns of H4350, Fed 210 primers, 70 TNT bullets, and Winchester cases. His forming load will group 1.25 to 1.5 @ 200 yds. This rifle has won numerous 500 meter & 600 yard competitions.