Quote Originally Posted by Coal Dragger View Post
True, if you wanted to run a match grade SS barrrel nitride might be a good treatment for it.
We have 4150 Melonite treated barrels shooting well under MOA with 69s and 77s now. Looking at the case capacity to bore area ratio they should last much longer than a 243 and maybe only 25% less than a 223. The problem with the 45mm long 22 Nosler brass is it is limited to the same bullets the 223 is. 77 and down. The 77TMK is really too long to get the bullet near the lands at mag length. If we cut the front of the mags out and load to 2.34" OAL we can get close and accuracy improves.

There have been several 22, 6mm, 6.5mm, and 30 cal cats based off the 6.8 and Grendel brass around for 10 years. Some that are 43mm and longer will limit us to what bullets can be used at mag length. These are short enough to use long high BC bullets.

224 Predator, 224 LBC, 224AR-All based on the Grendel case
6mm Predator, 243LBC, 6mmAR-All based on the Grendel case
5.56x42, Tac 5.56- based on a shortened 6.8 case
TAC6(6mm Herrett)-based on a shortened 6.8 case
30 Herrett, 30 HRT-based on a shortened 6.8 case(limited to 155gr bullets and under)
30 Gremlin -based on the Grendel case