A .30 caliber barrel will be chambered differently depending upon the cartridge it is designed for. When building a barrel, the smith first gets a barrel with a specific caliber, s.a. .30, or .22 then reams the breech end of the barrel to match the cartridge, s.a. .308 or 30-06 or 300 Win Mag. (all te same CALIBER, but difeferent CARTRIDGE. The internal dimensions of the chamber must be identical to the outside dimensions of the cartridge. Once the barrel's chamber and bore match the cartridge, it can be mounted to the action. The action's bolt face is the part of the bolt that holds the cartridge and allows the bolt to place the cartridge into the chamber and remove the empty case after firing. The bolt face must also match the dimensions of that particular cartridge. Many, different cartridges use the same bolt face because the base of the cartridge is the same. For example, the .308, 30-06, 25-06 and .260 (and others) all use the same bolt face even though they may be different calibers. However, the base of the .223 cartridge is smaller and therefore uses a different bolt face. So... it is important to understand what characteristics distinguishes one cartridge from another when choosing parts for a rifle. also, some cartridges require long actions, and some can be used with long or short actions. Perhaps before proceeding with your build you would benefit from doing some basic research on these fundamental and universal principles. If you do, I think you will have a much easier time going forward. :)
Also, a good place to start would be to become a Paid Member ($15 per year) and have access to great articles and FAQ's and technical "stuff" as well as the member's classified section/ For example, somewhere there is a "What Fit's" list that serves as a quick reference chart for what various cartridges require for bolt faces, etc. Very useful, but the info must be interpreted in its proper context.
Reply With Quote
Bookmarks