No4 Savage & L/Branch 2 groove barrels
Posted: Thu Aug 17, 2023 5:26 pm
A question for anybody who owns a US or Canadian No4 with 2 groove rifling.
I recently bought myself a very nice early production No4 Mk1 Savage rifle with 2 groove barrel, after spending hours cleaning out all the copper fouling i finally got to measuring the bore up which reads .3052"-.3053" with pin gauges and slugged the grooves dia at .317"-.318" my question is can you shoot .308" dia bullets in these barrels, i have read on quite a few US/Canadian forums guys doing so with good results so it must work.
My concern is by shoving a 303" .311" bullet down a .305" bore is increased pressure, theres little groove space to take up the .006" of bullet dia and a lot of bore contact to squeeze the bullet through.
I understand these were all feed .311" dia ammo in military wartime service so i suppose it works but if .308" work just as well at a lower pressure surely a better option and less barrel wear.
Any owners out there who have tried doing this.
I recently bought myself a very nice early production No4 Mk1 Savage rifle with 2 groove barrel, after spending hours cleaning out all the copper fouling i finally got to measuring the bore up which reads .3052"-.3053" with pin gauges and slugged the grooves dia at .317"-.318" my question is can you shoot .308" dia bullets in these barrels, i have read on quite a few US/Canadian forums guys doing so with good results so it must work.
My concern is by shoving a 303" .311" bullet down a .305" bore is increased pressure, theres little groove space to take up the .006" of bullet dia and a lot of bore contact to squeeze the bullet through.
I understand these were all feed .311" dia ammo in military wartime service so i suppose it works but if .308" work just as well at a lower pressure surely a better option and less barrel wear.
Any owners out there who have tried doing this.