HTI MILANO

FAQ FOR BOLT FACE DIAMETERS

What Calibers Use a .308 Bolt Face?

As the .308 Winchester cartridge uses the .470 +/- bolt face, all of the other calibers and cartridges listed on the bolt face chart above, with the .470 +/- bolt face diameter, use the same bolt face as the .308 Winchester.

What Bolt Face is a 6.5 Creedmoor?

As can be seen on the bolt face database chart at the top op this page. The 6.5mm Creedmoor uses the same .470 +/- bolt face as the .308 Winchester cartridge.

What is the Bolt Face?

The bolt face is the surface of the rifle bolt, that makes contact with the cartridge case head. It also usually hold the cartridge in position inside a rifle action, and usually has a ejector pin that ejects the empty fired cartridge case, after the shot has been fired. In center fire rifles, the firing pin comes through a hole in the bolt face, to strike the primer in the cartridge case which sets of the propellant to fire the bullet.

Will a 308 Action Work for 6.5 Creedmoor?

As both the .308 Winchester and the 6.5mm Creedmoor cartridges work in short actions, and use the same .470 +/- bolt face, a .308 Winchester action or rifle will work with a barrel chambered for 6.5mm Creedmoor cartridges.

What Bolt Face is .22-250?

.22-250 Remington cartridge uses a .470 +/- bolt face.

What Bolt Face is 6.5 PRC?

The 6.5 PRC cartridge has a .532″ case head and uses the .540 +/- standard magnum bolt face.

What calibers can a 30-06 be converted to?

As the .30-06 Springfield has a .473″ case head and uses the .470 +/- bolt face, any cartridges list on the above two bolt face diameter and action length database charts above, that also use the .470 +/- bolt face, and have a COAL of 3.34″ or shorter, will work with .30-06 actions. However, it is a waste of space to use short action cartridges in long actions.

What calibers use a 308 case?

The .308 Winchester is the parent case to familiar cartridges like the .243 Winchester, .260 Remington, 7mm-08 Remington, .338 Federal, ..358 Winchester and all their associate wildcat cartridges and calibers developed from them.

6.5 GAP 4S or 6.5 SAUM Short Action?

Generally the 6.5mm GAP 4S cartridges will fit in a short action, but with the newer and longer bullets like the Berger 156gr EOL Hunter and Berger 140gr EH or similar which offer much greater BC and weight, if they are loaded long enough to properly use the case capacity and correct placement of boat tail just below the neck of the case, then they will be too long to fit in a short action magazine. They will then either have to be loaded into the action one by one from the top after each shot, or it would be better to use a long or medium action to build this cartridge rifle to use to it’s full potential.

NOTE:

New Long, High BC Bullets

Something to remember when you are building a new short action to take the newer, longer high BC bullets, like for cartridges like the 6.5 PRC, 6.5 WSM, 6.5 SAUM, 7mm WSM, 7mm SAUM and other similar cartridges that usually are built in short magnum actions. When you have to seat those longer bullets in deeper into the case to fit in the magazine length, or in a normal short throat chamber, the bullet will take up more of the volume inside the case, which will mean less volume for the propellant or powder.

Keep in mind, as solid copper bullet tend to be longer than lead core bullets of the same weight, because the lead is more dense than the copper, you will be more suited to conventional lead core bullets.

If you do in fact want to build the rifle for long range and specifically want to shoot those long high BC solid copper or lead core bullets, you should rather consider a long action rifle or a medium action so you can have a longer chamber and longer magazine and often also have the gunsmith use a custom reamer with long throat, this way you will not have a problem running and cycling those long bullets at the required COAL for their full potential.

Please do contact us if you have any new calibers or cartridges you think we should add to the bolt face diameter chart above, we love learning about and teaching others about bolt face sizes and which are compatible. There are many changes that are quite easily compatible, like changing from a 308 Winchester action and chamber, over to a 6.5mm Creedmoor, or 6mm Creedmoor or even .22 Creedmoor. You can even change a .22-250 over to a .22-250 Ackley Improved, or a 22XC or a 22GT and even the same .22 Creedmoor mentioned above. When studying the bolt face charts above, you will see the the possibilities are endless.

It makes sense when you are quite heavily into precision rifle shooting, and going to change your barrel to a custom or competition barrel in any case, to just buy the rifle or action you want in any compatible bolt face action, and then fit the new barrel and cartridge chamber onto it, instead of having to wait for the action or rifle manufacturers to first have to produce the caliber rifle you want.