Using a older Hornady manual I started with a 140 grs Interlock with a initial charge of 28 grs of IMR-3031. Working my way up I found great groups at 200 yards with a charge of 32 grs, still way below max as shown in the manual. Once I got a tight cloverleaf I called it a day, this was with Norma surplus practice rounds that I pulled the little copper projectile and replaced the powder with 3031.