Heaviest projectile I shoot out of my Krag is 180Gr. I have successfully put 2300fps out of my krag with a Lapua 155Gr Scenar. I think I would be afraid to push a 200+ Gr. projectile to 2300fps. smaller projectile will produce less pressure since the gasses can escape the barrel faster due to the lighter projectile. Blunt force of a 200+Gr will defenately raise the PSI, making the action and bore more suseptable to damage or rupture. At least thats what I was taught.