I love the RMR Nukes! I have probably loaded over 4K over the years and just loaded a little over 2K a few weeks ago for my "stash" ammo. I used Power Pistol early on, a little over 5grns but used all that up. My recent loadings are with vihtavuori powder and they are superb! I can't remember what it was, if it's 320/340 etc., I would have to check my books. Anyways these bullets shoot great &, as stated, are a lot cheaper than the XTP bullets. I load everything and check them in my CZ pistols cuz of the shorter lead in them but they run great in my Staccato & my Glock 19X also. Anyway, they are great bullets for the $$$, and when they run some of their sales off, they are even better.