One of the two loads I use in my blackout 9" pistol is the speer 130 gr varmint bullet. I have found it is accurate no matter how you load it. I tried 3 powders, several OAL, use a light crimp with lee FCD and the difference in
accuracy between best and worst was maybe worth 1/2 inch at 100 yards. If the 130 you are using is the speer (2005 is the mfr nbr for it i think) you have a great bullet. Easy to load, and it expands at very slow velocities.
I use starline brass which has less case capacity than anything else, i've read they have made some small changes and increased the case capacity a little recently but all my brass is the old style. I use Accurate 11FS
for it and get just over 2000 fps, burns clean. With Vihta N110 I got it up to just over 1900 fps and ran out of case capacity, very accurate, low es, cleanest powder I've ever used. I use N110 for my subsonic load.
I've tried IMR 4227 briefly, it's just too slow both burn rate and FPS for the 130 speer. Think it maxed out the spear in mid to upper 1700's fps, memory could be wrong but it was slow.