I'm working on a load just like that for a WOA 1-7 18". With the Hornady 75gr BTHP and 23.4gr Varget set at OAL 2.250 I'm getting 1 MOA at 2527fps average. Still working... I have some loads with up to 24.1gr and some more with AA2520 but I haven't gotten a change to try them out. I hope to try them Tuesday and I'll let you know what I get.