What other then a hot load would cause this?
- Thread starter 20ozjolt
- Start date
Was going to insert a “hot load” joke but I’ll refrain. But my guess would be a loose primer pocket and over pressure. Do you reload? More details are needed.
Ar10 308 18"barrel, mega melonite 5x51 one, headspace was checked at install, before today less then 60 rds through the rifle, cleaned after last use, so far only fed m80 ball before this.
This was hornady Superformance sst 150gr factory ammo.
Was about 80 degrees and 70% humidity, rifle had shot about 20 rods of m80 ball before the hornady.
All all ammo came from house, temp 70 humidity about 50% fresh from box no dirt moisture ect.
I'm not saying it wasn't a hot load just wanting to eliminate all other possibilities.
Any other info needed?
This was hornady Superformance sst 150gr factory ammo.
Was about 80 degrees and 70% humidity, rifle had shot about 20 rods of m80 ball before the hornady.
All all ammo came from house, temp 70 humidity about 50% fresh from box no dirt moisture ect.
I'm not saying it wasn't a hot load just wanting to eliminate all other possibilities.
Any other info needed?
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When he mentioned headspace I think he was meaning the case was headspaced too short. I've had factory Hornady 308 soft point that showed severe pressure signs.
I wrote Hornady an email and they asked for the remaining cartridges back and provided a shipping label. They reimbursed my ammo with a new lot.
I wrote Hornady an email and they asked for the remaining cartridges back and provided a shipping label. They reimbursed my ammo with a new lot.
Hornady says that Superformance is ok to use in gas guns but they recommend at least a 20" or longer barrel with a rifle length gas system for the best reliability. Shorter than that they recommend an adjustable gas system.
I dont care what Hornady says. Superformance has always been hot in any gas gun Ive tested it in. You just found out why...
Bottom line is, that specific factory load is to hot for your AR.
Or more explicitly, the powder , and the charge weight used doesn't play well with your gas system length. ( Port Pressures matter )
Its one thing to have ejector smear... but a popped primer is another thing all together.
Did the primer fall out of the fired , ejected case, or did it fall into and gum up your AR's action / trigger.
Does your 308 AR have an adj GB on it ?
What buffer weight and recoil setup ?
The extraction cycle was occurring while chamber pressures were higher then "normal"... and on that note how does the case rim look ?
And the weakest link gave way... the primer... and primer pocket is probably pretty loose now.
See if you can easily push the spent primer back in... with just thumb pressure.
Or more explicitly, the powder , and the charge weight used doesn't play well with your gas system length. ( Port Pressures matter )
Its one thing to have ejector smear... but a popped primer is another thing all together.
Did the primer fall out of the fired , ejected case, or did it fall into and gum up your AR's action / trigger.
Does your 308 AR have an adj GB on it ?
What buffer weight and recoil setup ?
The extraction cycle was occurring while chamber pressures were higher then "normal"... and on that note how does the case rim look ?
And the weakest link gave way... the primer... and primer pocket is probably pretty loose now.
See if you can easily push the spent primer back in... with just thumb pressure.
Hornady running the ragged edge in pressure I see. Ditch the superformance. I’m not trusting much they put out these days. Their regular 308 Whitetail ammo was a bit warm and they must crimp the primers because I couldn’t get a primer to start after resizing. I should dig them back out and check them out. Lord knows I’ve got the time these days.
Thats some serious case damage there, if I didn't know any better I'd say you were close to a catastrophic failure.
Yes adjustable gas block, I dont remember buffer weight, it was the standard that was recommended by a shoe that builds custom rifles...
That smear is where the case was driven into the ejection port front edge by the bolt, primer was found in my mag, yes it slid smoothly back into the pocked with almost no force.
That smear is where the case was driven into the ejection port front edge by the bolt, primer was found in my mag, yes it slid smoothly back into the pocked with almost no force.
Suggest 7.62x51 NATO 168 Grain HPBT SMK OTM RazorCore Semi-Auto Match Ammo by IMI.
It runs OK in my bolt rifle, matches drops in my BDC scope out to 300yd, is affordable, and reloads fine once the primer crimp is removed.
Greg
It runs OK in my bolt rifle, matches drops in my BDC scope out to 300yd, is affordable, and reloads fine once the primer crimp is removed.
Greg
Is that how you got your lazy eye? ???
OP - try the Hornady black rounds. Very accurate out of multiple rifles for me. Built for gassers.
Had 1 savage bolt .308 when I started this rifle that shot superformance well. Never another. Too hot
