I'll tell you what I've got, it may not work for you, I built a 24 in 375 H&H some years ago for a customer who suffered a stroke before completion, it was either A douglas or shilen blank I just don't remember, it was built on a Mauser action all but the bluing and checkering were complete, I ended up rebarrling to 416 for another project, before pulling the barrel I shot the gun to see how it shot, it was exceptional, so I kept the barrel shortened the the chamber about 0.800th I planned on building a feather weight in 376 styer but never got to it, so I have a 23 inch plus a little bit long partial chambered barrel, which may or may not work for whatever project you have