I owned one of the .307's in the mid 80's. It was a great shooting gun out to 300 yards, that's as far as I practiced with it. We were shooting reloads but don't remember the powder but we did use the flat nose 150 grain boat tail bullet. The gun would shoot sub 1 inch groups at 100 yards. The reloads we were shooting were hot and you couldn't shoot them on a hot day cause you couldn't eject the shell after shooting. Back then, I didn't realize that a hot outdoor temperature would effect the cartridge. I thought the gun was coming apart and got rid of it. I wished I had kept it.