Although the bullet I'm using is lighter, 55gr Hornady SP w/ Cannelure, my best group's with Varget, using 25gr, CCI BR-4 primers, and my once fired LC brass grouped 1.12in at 100yds and 1.9in at 200yds(outside edge), and that is a minimum load from my Lymans manual. Hodgdon's site called for 25.5grs with 55gr SPR SP which I take it are Speer rounds. Speeds averaged about 2900fps, mainly around 289x to a smudge over 2900. Had no issues with it. It's hard to come by so I've been a bit reluctant to experiment beyond that right now.
Rifle used is a 20" AR 15 w/ 1:9 twist, free floated barrel heavy barrel.