as what has been posted ,your barrel need`s cleaning. buy some sweet`s 7.62 solvent do what the directions tell you,also buy 2 new 30 caliber bronze brushes and scrub the heck out of that barrel. then take a bore scope and see if its clean should be only a steel shiny color ,if it shows a color kinda goldish more sweets over nite ,dry out again,more bore solvent on bronze bush and more scrubbing ,another good solvent is GM power tune engine cleaner buy it at GM garage.
the other thought is sell me that old 721 Remington and buy a new gun ? if your going to keep your gun stay with old reliable and easy to find ammo 30-06. good luck,Pete53

Last edited by pete53; 03/19/18.

LIFE NRA , we vote Red up here, Norseman