FWIW, I have been loading .223 since 77, for a Remington 700 BDL, and later a Contender with a Bullberry carbine barrel using FL dies and full length sizing.
Bought a Bushmaster in 2000 for $500, the only ammunition I had was what I had reloaded for the other rifles, they were tight chambering, shot OK, but then I got one stuck in the chamber.
Bought a SB sizer , no more hard chambering ,stuck cartridges, brass lasts as long as brass shot from the other rifles.
I use the SB sized cartridges in the TC now too. But not for the Remington