[oneeyesnipe]

I bought once fired brass and used the full leght rcbs dies to deprime and resize at the same time. my question is I have a Sabre 223 ar 15 when I resized all that 223 brass with the full length dies beig the tolorance for a semi auto is less when feeding vs bolt action do i have to resize all this brass a small throat die again or can i take one of those 223 rounds and chamber it by pulling back bolt and put it in the breech and if it fits in chamber the case is already narrow enough I am lost please help:uhoh:

[mc223]

The Sabre is chambered for 5.56 which is generous enough. The full length sizing with standard dies will be adequate in most cases. You can slip an empty unprimed case in the chamber to check.