Originally Posted by meatyrem
Ya I don't know about the 22-243. I would think it would be much longer than the 22-250. This case is only about .110" longer than a 22-250. I've not yet heard of the .224 vias. Is there anywhere I could find more info on this round? Idk
The head stamp on the brass is LC 67 NM which is "Lake City 67 National Match" = .308 parent. the .243 also starts with a .308 parent. The standard SAMMI specs for the .308 are below, very close to your case which we know was a .308 at one time.
.308 case info
Case type Rimless, Bottleneck
Bullet diameter 0.308 in (7.8 mm)
Neck diameter 0.3433 in (8.72 mm)
Shoulder diameter 0.4539 in (11.53 mm)
Base diameter 0.4709 in (11.96 mm)
Rim diameter 0.4728 in (12.01 mm)
Rim thickness 0.0539 in (1.37 mm)
Case length 2.015 (51.18 mm)
Overall length 2.800 (71.12 mm)
Case capacity 56 gr H2O (3.64 cm³)
It could be a .224 Vias, but based on how rare that round is I would lean more towards a 22-243 middlestead since it has a 30 degree shoulder or a .22 cheetah which is based of the middlestead with a 40 degree shoulder or maybe just a 22-243 since that round also has a 40 degree shoulder So with out seeing the case I would say this is a very well educated guess based on the info you have supplied.