I use it, purchased 16 lbs!!! My pet load is 25.4 gr under a 55gr this load works well for 3-gun. It shoot great out to 200 yards (Furthest I've shot with it), it cycles all my AR's flawlessly, and pleasant recoil! This load is about 1 gr under Hornadys max load. I have no idea what fastshooter3 is talking about too slow, huh what does that mean. You don't need max velocity for 3-gun but you need good shooting. As a point of reference the POI at 100 yards in the same with this load as it is with 25gr H335 at 100 yards. I still have a bunch of 223 I loaded up with H335 and I can use the 2 loads interchangeably, that's one of the reasons I chose 25.4 gr Varmint.
YMMV