My only use for 4320 was for colony varmint cartridge ... .17 Remington and .220 Swift. My swift load was a fireforming load with the 52 grain Speer hollowpoint around 3300 fps that shot quarter inch groups. In the .17 I used 25.2 grains under 25 grain Remington hollowpoints and somewhat frequently had groups fall under 1/10th of an inch out of a factory 700 BDL. I'd dropped a 2 ounce 40x match trigger w/o a safety into the action and stuck it in an HS precision stock for a 1.25" cylindrical barrel .. yep, that one was free-floated.
Good times. Sure wasn't a gun I let anyone else shoot. That load is apparently a good bit beyond book maximum now but it was book, top end, when I worked up to it.
I have a few pounds on hand 'cause I do plan to do another .17 Remington. There are other good powders, but only one that is truly spectacular: 4320.
