I have a 223 that loves 50 gr. V-Max. One load this rifle loves shoots 4 in 1 hole with the 5th shot making the group .250. at 100yds., If I do my part. When I go to 55 gr. V-Max the groups open to near 1 inch. I found I have to go to jacket core bullets like the 55 gr. Hornady SX to get the bullet length to work with the twist in the barrel. And an old Rem. 722 222 Rem. that lives here loves 50 Gr. V-Max too.