Why you want smaller bullet for mosinka? Is not good enough as produced from izhevsk, tula, or sestroryetsk? Maybe you find job with army of russia, have many vodkas with sergei mosin and leon nagant and trade details of many weapons designed! But you no do this! Because you never design weapon in entire live! You look at beautiful vintovka, think too hard on weak capitalist shoulder, too loud on delicate capitalist ears! You think it need smaller american pea shooter bullet instead of glorious soviet 7.62! Why you think 5.56 better than oldest serving military cartridge in world??? This talk of decadent american capitalism! Maybe you put ### dildo on top to screw yourself for making shame of tough soviet workhorse! Leave rifle as is. Fire many round. Let rifle soak in drano. Make spaghetti. Watch octopus ####.