I have used everything listed thus far except ultramax.
I took the crony out the last two days and clocked the factory Hornday 55gr V-max at 2965fps and USA Ammo 55 gr V-Max at 2984fps out of my SD .223 18" barrel.
The Hornady fps was more consistent and my groups were 1/2" at 100yds
Where with the USA Ammo was holding between 3/4-1/2" groups.
The USA Ammo comes in loose bulk packs of 50, 250, 500, and 1000 (i think) and averages about .50-.60 each.
I was clocking the 62gr PSP from USA Ammo at 2870 fps out of my son's Savage Edge/Axis 22" barrel with consistent 1/2" groups and 3080 fps with the 55 gr V-Max (USA Ammo) with 3/4" groups.
Forgot to mention;
USA Ammo doesn' t always have the 55 gr v-max or 60 gr v-max so when they have them, buy them or it could be a while before they produce them (if).
Also when I ordered the 62 gr SPS they sent me 62gr FMJ and when I got in touch with them, they let me keep the FMJ and sent me the SPS at no extra charge.......so they are GTG as far as being standup with me.