Thanks for the "heads up"! I ordered a box of 250 to add some extra brass to the 200 rounds of factory ammo from Midway USA that I bought last month. A Forum member suggested that Starline Brass in .45 Schofield would also work for the MKII. It does! I just made up 50 rounds and they cycle thru the MKII without issue. 262 gr cast lead bullets are available from Lee's Ammo in OK. Now to the range.