Good luck in your search. I just happened across your post and threw that in just in case. My 1000 yd gun is a pre-64 M70 (RH) with a 26" med heavy E.R. Shaw barrel hand made by Olie Olsen, HS Precision stock, chambered in 30-338 longthroat for 200 grain Matchking or Nosler Partition depending...
When I lived in Peters Twp. I had a great little LEFT HAND rifle made for me by Olie Olson at E.R. Shaw in Bridgeville. It is a 375/284 (375 Butch) which is the 284 Win case necked up to 375 with a 40 degree shoulder. It has a medium weight barrel. Everything is matte black finished. It comes...
Actually, it is a standard 338 Win case necked down to .308. Simpler to load with minimal case fire forming and less case stretch by keeping the same 25 degree shoulder angle. I just had the rifle throat lengthened so I could seat the 200 grain Nosler Partition out where the bullet base is...