308 Chamber Dimensions

[46490]

Is there an easy way to determine the dimensions of a chamber? I have a Savage Model 10 and want to get the best accuracy possible by knowing the size of the chamber and getting the correct bushing size for the neck. I will be using Salt Lake City brass.

 

[jackieschmidt]

Actually, the bushing size is determined by the wall thickness of the case neck. Any ammo you fire will expand to your chamber’s neck. A thinner neck will require a smaller bushing to get he same amount of neck tension.

While there is a specification for factory necks in loaded ammunition, different manufacturers will exhibit different thicknesses, usually erring on the side of a little loose. You really need to fire a round in your rifle, and see what size bushing will resize the case neck to arrive at your desired neck tension.

 

[DaveTooley]

Measure a loaded round and get a bushing .004" under that measurement.

 

[6bra1k]

your question have a large conflict, ACCURACY and SL brass.
they only made brass in the early 40's . not accuracy driven product.
so nearly 80 years old and mil spec.
this is no way to begin the search for accuracy
some lapua peterson other top name brass