5.56 Ammo | Fenix Ammo

How to Choose 5.56 Ammo

Match the load to the session. General range work and carbine drills run cheapest on the 55 grain FMJBT, and the 62 grain FMJBT gives you a heavier bullet in the same 250 count format. Precision days call for the 75 grain FXP HPBT, while the 55 grain FXP VMAX brings a polymer tipped projectile to varmint duty. If you are unsure, start with 55 grain FMJBT and let your groups argue for anything else. Whatever you pick, buy enough of one load to actually learn it; chasing a different bag every order teaches you nothing about your rifle.

Barrel Twist and Bullet Weight

As a general guide, faster twist barrels like 1:7 and 1:8 do their best work with heavier bullets such as the 62 and 75 grain options, while 1:9 barrels are happiest with lighter bullets. That is general barrel behavior rather than a promise about your rifle, so let your own targets make the final call between weights. Your barrel's twist rate is usually stamped near the muzzle or printed in the manual, and thirty seconds of checking beats guessing at the counter.

FMJBT, VMAX, and HPBT in Plain English

FMJBT is a full metal jacket with a boat tail base, the standard training projectile. VMAX is a polymer tipped design built for rapid expansion on varmints. HPBT is a hollow point boat tail, a match style projectile shaped for consistency at distance rather than for defense. The label on each bag tells you which projectile you are loading before you open it. None of these labels is a gimmick; each names a real projectile family, and the product page for every load spells out exactly what is seated in the case.

Buying 5.56 by the Session

The two FMJBT loads come 250 to a pack, which outlasts most range days. The VMAX and HPBT loads come 100 to a pack, sized for the slower pace of precision and varmint shooting. Divide live price by round count when comparing, and remember that specialty projectiles cost more per round by design. A practical starter order is two 250 count FMJBT bags and a single 100 count of the specialty load your shooting actually calls for. Sealed bags store for years in dry conditions, so buying a quarter's worth at once costs nothing but shelf space.