I bought a .400 Corbon barrel andsome RCBS dies and started loading. I have noted problems with flowing and severely flattened primers. Some primers would show very high pressure signs, and others would look just fine. This problem happened with both handloads and factory ammo.
It seems there is a problem with this round in that there is not enough neck to hold the bullet in place. Chambering a round slams the bullet against the feed ramp. This will almost always set the bullet back in the case to some extent. I then bought a cannelure tool to roll cannelures into the non cannelured 135's. I roll crimped the bullets so hard into the case that the neck bulged and would not feed into the chamber (backed off then so it would fit). It seems you can't crimp the case neck hard enough to prevent this from happening. What was happening is that the bullet was sometimes pushed too far back into the case, decreasing the case capacity. I think this is leading to an overpressure situation.
Try this experiment: measure the OAL of a live cartridge (factory or handload). Chamber it in your gun and pull it back out. Now measure the OAL again. It will probably be shorter. Not good.
At this point I'll try lead bullets. AA has some lead bullet loading data in their latest manual.
Is this another of Peter Pi's ideas that hasn't panned out?
It seems there is a problem with this round in that there is not enough neck to hold the bullet in place. Chambering a round slams the bullet against the feed ramp. This will almost always set the bullet back in the case to some extent. I then bought a cannelure tool to roll cannelures into the non cannelured 135's. I roll crimped the bullets so hard into the case that the neck bulged and would not feed into the chamber (backed off then so it would fit). It seems you can't crimp the case neck hard enough to prevent this from happening. What was happening is that the bullet was sometimes pushed too far back into the case, decreasing the case capacity. I think this is leading to an overpressure situation.
Try this experiment: measure the OAL of a live cartridge (factory or handload). Chamber it in your gun and pull it back out. Now measure the OAL again. It will probably be shorter. Not good.
At this point I'll try lead bullets. AA has some lead bullet loading data in their latest manual.
Is this another of Peter Pi's ideas that hasn't panned out?