Yesterday, I finally started the process of building some cast ammo for AR.
I did some in 2012, back before the sandy Hook incident, but after then, the prices of ARs went crazy, and I sold the rifle.
Last fall, I bought two ARs when the price bottomed out. Both are DPMS, one a Oracle the other a sportical. I had planned on using the Oracle...and this is what this post is about.
I built the first dummy round to find the starting point...OAL for the HM² 225-62-1
No matter what length, the cartridge would stick in the chamber.
I tried a 55gr. J-word, same thing.
I tried a Mil surp round, same thing.
I tried a FL sized empty case, same thing.
Looking into the chamber with the naked eye, all looked OK.
So then, I dug out the Sportical,,, that thing would successfully chamber everything... up to the Dummy round seated to a OAL of 2.215
So I settled with 2.195 (.020") of the lands, crimped with a Lee FCD. So I guess I'll be using the Sportical...and some day, I'll have to dig into that Oracle, and clean the chamber vigorously with a brass brush...as I wasn't set up to do that while all this dummy round assembling was going on.
Anyone have experience with a brand new rifle with a problem chamber?