11-12-2013, 08:12 PM
I noticed that Hornady brass has a chamfer at the radius of the case head. I think this is meant to articulate with sharp ejectors as well, during the feeding cycle when the cartridge hands off from the feed lips into the bolt face.
This is why I radius or chamfer the ejector face, which deals with the Lapua brass, and is a common practice among hi-power shooters that shoot not only PPC based cartridges, but others as well.
Another funny thing about Stoner design bolt carrier groups is that I saw a picture recently of an original AR10 BCG from the early 1960's manufacture. The ejector was beatifuly radiused around its entire face, and the whole unit was chromed.
As to 7.62x39 bolts and AR15's: There is NO industry standard for the 7.62x39 AR. The original company that did the work on it, and produced a 7.62x39 AR15 as the 7.62 Sporter II, was Colt. Most of the manufacturers who jumped on it in the parts industry like M1S and DPMS used parts that are well known for failure. Much of this was exacerbated with the use of Eastern bloc 7.62x39 ammunition that is really .311" diameter, in US-made .308 bored barrels, spiking the start pressure and bolt thrust, cracking lugs left and right.
![[Image: all.jpg]](http://www.c3junkie.com/m16/762/all.jpg)
The AR Performance 7.62x39 bolt did a lot to address this issue, by using better alloy, correct heat treatment, and melonited barrels.
This is why I radius or chamfer the ejector face, which deals with the Lapua brass, and is a common practice among hi-power shooters that shoot not only PPC based cartridges, but others as well.
Another funny thing about Stoner design bolt carrier groups is that I saw a picture recently of an original AR10 BCG from the early 1960's manufacture. The ejector was beatifuly radiused around its entire face, and the whole unit was chromed.
As to 7.62x39 bolts and AR15's: There is NO industry standard for the 7.62x39 AR. The original company that did the work on it, and produced a 7.62x39 AR15 as the 7.62 Sporter II, was Colt. Most of the manufacturers who jumped on it in the parts industry like M1S and DPMS used parts that are well known for failure. Much of this was exacerbated with the use of Eastern bloc 7.62x39 ammunition that is really .311" diameter, in US-made .308 bored barrels, spiking the start pressure and bolt thrust, cracking lugs left and right.
The AR Performance 7.62x39 bolt did a lot to address this issue, by using better alloy, correct heat treatment, and melonited barrels.