Here is a suggestion that may help in picking a Mosin Nagant. I have used an M1 Garand muzzle erosion gauge to provide a rifle to rifle comparison at the gun store. My four Finnish 28-76 rifles are 0 on the gauge, .300" bores. I recently purchased a 1934 Tula that measured 3 on the gauge, .303" bore. I have a 1917 Remington that was probably used in WWI, captured by the Finns in the winter war, recaptured by the Russians, and finally imported to the US. The muzzle has been counter-bored 5/8". After accounting for the counter-bore, it appears to gauge at 1, a .301" bore. After a good cleaning, the lands and grooves appear bright and shinny. Even this sad looking rifle may be a good candidate for cast bullets.