i run lovex do-63.1 in my blackout. havent got to shoot any in the 450 *yet*
shooters world blackout is d0-63.2, nearly identical stuff.
its a very clean powder, even when shot suppressed.
it is a little faster than 1680, i had to reduce my loads by roughly 0.3gr to maintain subsonic velocity's when using 1680 data and 208 amax.
when i get my guns out of their winter hibernation, one of my early tests is going to be 300gr XTP's with it, just to see where its at in a big bore
as i understand it, lovex used to make 1680 for AA and lost the contract somewhere along the way (just like hodgdon buys a bunch of powder from ADI in Australia ). do-63 is their equivalent, probably modified just enough in its composition to avoid any infringement.
supposedly it does well in 7.62x39 too, but ive never messed with reloading that since steel blasting ammo is so cheap.