I have a 1956 Steyr Mannlicher MC 7x57 and it shoots good with 140gr Remington Corelokts. When I first got it I had no brass so I bought a box of 140gr Remington ammo. It puts 3 into 1" at 100 yards with a 4x scope IF I do my part. I loaded some 140gr Corelokts seated out and the rifles didn't like that. I seat the bullets to the cannelure and all is well. I looked at the bore with my Lyman bore scope and it's a bit rough with shallow pits. I cleaned it down to bare metal and I won't make that mistake again! It took several shots for it to settle in.
