02-16-2021, 10:51 PM
SH,
Thanks for those measurements.
I don't know about the die coming loose theory. The die may have come loose and your OAL crept longer, but at some point you would not have been able to load them in a magazine. Unless the chamber is shorter than the AR magazine, which is unheard of, it won't reach the lands. In an AR the mag is always the limiter for OAL length and we all load to the mag limits without fear of jamming in the lands. That eliminates OAL as the cause, unless the round slipped forward from intertia.
Your neck measurements are all fine. Plenty of clearance to release a normal diameter bullet. Plenty of grip on the bullet to stop it sliding from inertia and the diameter of the chamber at the neck is well machined at just under 0.300". So that eliminates those potential reasons.
That's cool that Midwest has an exclusive on no-packaged Hornady's. But that also seems coincidental. Not unusual for manufacturers to test market a potential new product in a geographic location, or in this case use one retailer. No expensive fancy packaging until they see it selling. With the cannelure it was manufacturerd to be fired out of an auto-loader so maybe it's an overrun for a Government contract - perhaps an overseas contract. Midwest are marketing them as both hunting and match but the customers are saying they are cheap plinkers suitable for neither. Typical bulk military type bullets... Intriguing.
Getting back to your bolt because they are bulk, cheap, limited run bullets what if one was a bit out of spec? Wouldn't take much to spike the pressure if one slipped through and was a tiny bit wider than .264.
You could simulate the bullet on QL to be sure. For that, measure (1) the length of the bullet, (2) the diameter at the shank, (3) the diameter at the narrowest part at the tail and (4) the length between the narrowest part and where the shank starts (so you are measuring the shape of the boat tail). If you want to do that I can run a QL simulation. But, it doesn't sound hot so you'd just be ticking this possibility off the list.
.
Thanks for those measurements.
I don't know about the die coming loose theory. The die may have come loose and your OAL crept longer, but at some point you would not have been able to load them in a magazine. Unless the chamber is shorter than the AR magazine, which is unheard of, it won't reach the lands. In an AR the mag is always the limiter for OAL length and we all load to the mag limits without fear of jamming in the lands. That eliminates OAL as the cause, unless the round slipped forward from intertia.
Your neck measurements are all fine. Plenty of clearance to release a normal diameter bullet. Plenty of grip on the bullet to stop it sliding from inertia and the diameter of the chamber at the neck is well machined at just under 0.300". So that eliminates those potential reasons.
That's cool that Midwest has an exclusive on no-packaged Hornady's. But that also seems coincidental. Not unusual for manufacturers to test market a potential new product in a geographic location, or in this case use one retailer. No expensive fancy packaging until they see it selling. With the cannelure it was manufacturerd to be fired out of an auto-loader so maybe it's an overrun for a Government contract - perhaps an overseas contract. Midwest are marketing them as both hunting and match but the customers are saying they are cheap plinkers suitable for neither. Typical bulk military type bullets... Intriguing.
Getting back to your bolt because they are bulk, cheap, limited run bullets what if one was a bit out of spec? Wouldn't take much to spike the pressure if one slipped through and was a tiny bit wider than .264.
You could simulate the bullet on QL to be sure. For that, measure (1) the length of the bullet, (2) the diameter at the shank, (3) the diameter at the narrowest part at the tail and (4) the length between the narrowest part and where the shank starts (so you are measuring the shape of the boat tail). If you want to do that I can run a QL simulation. But, it doesn't sound hot so you'd just be ticking this possibility off the list.
.