Somebody had to start this, so I'm jumping in. The .30 XCB is a joint project among several CB members, particularly Larry Gibson, Runfiverun, Btroj, and myself; Goodsteel (Tim) of MBT is the builder.
What we wanted to create is a versatile wildcat with potential for extreme accuracy, high velocity, and low expense to be used primarily, but not necessarily exclusively, with cast boolits. Part of the economy is being able to use several different and abundant parent cases for brass, and to end up with something that will feed easily in most rifle actions, especially large-ring Mausers. We accomplished this by essentially short-chambering a tight-necked .30-'06 to 57mm which enables the use of modified factory '06 dies for reloading, and following the SAAMI-spec throat design allows for the use of a variety of .30-caliber cast boolit designs.
Other advantages of the case include the natural taper of the '06 which tends to extend the pressure curve of any given powder slightly vs. more "straight" designs, a capacity which should enable up to 2600 fps with reasonable pressure and projectiles in the 150-180-grain arena, and being able to eliminate the off-center head bulges of typical once-fired brass through resizing in a cut-down factory die. The straight neck has its own advantages.
Tim just finished his work on my barreled action and returned it to me, I have to say I'm duly impressed. He de-marred and refinished my factory barrel nut, machined a thicker and perfectly flat recoil lug from scratch, chased the threads out on my barrel tenon, cut off and re-chambered to .30 XCB with his custom-made, TRUE floating reamer support, refaced the action, and put it all together for me exactly per my requests. No extra fluff on this one, it is a plain Savage 110. I'm planning to put this in a custom-built, laminate benchrest stock but for the time being the flimsy factory one will do.
This is a fresh start for me, so I'll chronicle my experiences and hope the others will chime in as their rifles are completed.
Gear