In no particular order,
Shooters use 5.56 ammo in .223 bolt guns or suspect chambers locking them up, dropping primers, calling to complain. I think this is less than cited but still a factor.
Shooter knowledge or ability isn't enough to produce the gain. Normal .223 pressures and velocities are fine for those.
Shooters stretching loads out and seeing the gains are probably reloading.
Faster isn't always better. Bullets may prefer a certain velocity window. (Even when present, may be small enough to escape knowledge/ability.)
When we talk about a "5.56" variant, are we talking about just speed, or other stuff too?
2012 National Zumba Endurance Champion
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I generally stay away from 5.56 MAX loads, but I do exceed .223 Rem pressure loads. I'm looking for a balance of velocity, accuracy, and long brass life.
I load my 77 grain OTM's with 24.2 grains of TAC (LC brass, CCI 450 primers, 2.250" COAL). Book 5.56 MAX is 24.8 of TAC. Book .223 Rem MAX is 23.4 of TAC.
In other news, I recently got 500 new Starline 5.56 cases, so I will be working up some new loads with those. Surprisingly I found the new Starline cases only 1 grain on average heavier than my average LC brass cases.
I haven't done any water capacity tests with these new cases until I have some fired Starline brass. Too hot out right now for this old man. I think I'll wait until fall.
Last edited by BobinNC; 07-11-22 at 12:51.
That's what I do too. Lately though, I've been running current production CC 41s. And it seems like no matter how much I reduce the load, the brass is still roasted.... swipes, popped primers, etc. I literally pick up my brass and toss it all into the recycle bucket. ZERO chance of getting more use out of it.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
I haven't really insulted H322 with those annoying ass primers. I've shot TAC and IMR 3031. Backed the 3031 off a half grain (from my Wolf SRM load) and still get swipes and a popped primer with 69 gr bullets only going 2850 out of a 20" bolt gun. 2850 is a decent velocity, but shouldn't be popping primers.
The factory Norma 69s were over 2900 fps for reference.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Mark, you think CCI 41’s have gotten significantly hotter in the past few years? That might explain my increasing velocity woes and wrecked primer pockets.
Last edited by 1168; 07-12-22 at 06:23. Reason: Grammar hard.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
For what it's worth, chasing an extra 50-75 fps isn't worth the potential problems. Do the wind on the difference and you will see 95% of folks most likely can't work the wind difference let alone the accuracy of the "system"
It just worked out this way for accuracy, my bolt gun is 23.6 8208 with the 77 TMK and the LMT 20" is 23.2. The semi is at mag length and bolt is longer, no pressure and at 3 loads, annealed each time. Both FGMM 205's
I always laugh at folks to dumb to find 5.56 online and will come in the shop asking for it and if we don't have it say "I only shoot 5.56 in my gun" -well guess your not shooting then are you? Keep in mind these folks are shooting at 25 yards.
GET IN YOUR BUBBLE!
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