300 Blackout Ammo: Supersonic vs Subsonic Loads Explained
300 Blackout ammo comes in two families: supersonic 110 to 150 grain loads and subsonic 190 to 220 grain loads. SAAMI specs, factory velocities and the 5.56 warning.
Rifle Calibers
30-06 Ammo: Bullet Weights, Velocity and the Garand Question
30-06 ammo by the numbers: SAAMI pressure, 150 vs 180 grain factory ballistics, recoil against .308, and whether commercial loads are safe in an M1 Garand.
Read the articleRifle Calibers
Rifle cartridges compared on pressure, bullet diameter and published velocity, with the standard and the test barrel named beside every figure we quote.
-
-
45-70 Ammo: The Three Pressure Levels Explained
Every 45-70 round fits every 45-70 rifle; not every round is safe in one. The three pressure tiers, in the ammunition makers’ own published words.
-
30-30 Ammo: Ballistics, Bullets and Lever Guns
Why 30-30 bullets are flat-nosed, what elastomer tips changed, and the published ballistics for every current load — with the test barrels named.
-
6mm ARC Ballistics: Drop, Energy and Every Load
Every published 6mm ARC figure comes from a 24-inch barrel. Full trajectory tables, all eleven factory loads, and what a shorter barrel actually costs.
-
45-70 vs 30-30: Power, Range and Which Lever Gun
The .30-30 runs at higher pressure than the .45-70, and by 300 yards a tipped .30-30 matches it for energy. What the published figures actually say.
-
50 BMG Ammo: Specs, Loads and Where It Is Restricted
SAAMI does not standardise .50 BMG — we checked four of its documents. What does, what the loads publish, and the four places it is restricted.
-
8.6 Blackout Ammo: Loads, Twist and Ballistics
SAAMI accepted 8.6 Blackout in January 2026 and specified a 1-in-6 twist. The catalog sells 1-in-3. Published loads, ballistics and what that means.
-
350 Legend Ammo: Loads, Ballistics and State Rules
SAAMI tests 350 Legend in a 16-inch barrel, not the usual 24. Every cataloged load, and what four states actually require — one repealed its rule.
-
270 vs 308: Which Is Higher Pressure Depends on the Test
SAAMI rates the .270 at 65,000 psi and the .308 at 62,000 — but by copper crusher both are 52,000. The real difference is 13 inches of drop at 500 yards.
-
308 vs 7.62×51: There Is No SAAMI Standard for the NATO Round
SAAMI’s rifle standard never mentions 7.62×51 NATO. The military spec limits it to 50,000 psi by crusher — and SAAMI’s own warning is about headspace, not pressure.
