My Savage 7mmWSM has about 1400 rds. down the barrel,so I want to start getting things ready for a rebarrel,once I decide the barrel is shot out.I am interested in getting a PK brake on it,but not sure what size to get for a 7mmWSM,I see there is 3 different sizes.Would going a liitle extra big offer any benefit?Also,can those brakes be reused for future rebarrels?