Well, before I ended up picking up a used BR gun that came with new Dasher barrel, I was planning to have you chamber up a 6BRA for me...for this very reason. Throat life. I'll be monitoring closely. On one hand, I was able to drive the 88 Bergers 3,500 FPS without notable pressure signs (AA2520) with the Dasher, which is nice, but I'll be depressed if it burns out too quick. Now that I'm "pot committed" with a buncha fireformed Dasher brass, it might be a tough call (between 6BRA and Dasher) once this barrel burns out. I wish there was more "data" on the barrel life differential between a short neck and longer neck.I wouldnt say that, lots of guys here shoot way more than I do. I was into it a few years ago more than I am now. A lot of guys like the smaller bores so they can watch impacts. I did a 22 dasher but went back to the 6mm. The smaller bore didnt really kick that much less and I found the 6 much easier to keep in tune and less picky. Plus those 6mm 55-60 grain bullets at 4k will throw a ground squirrel 20 feet.
For high volume varminting, my previous 6BR barrels each went about 6,000 rounds. My most recent one went 6,000 and was (is) still "generally" shooting .25" groups at 100...just firecracked pretty bad and I was getting tired of the fouling so I put a new barrel on. IF I were using the same cool burning powder and 55gn bullets, I'd sure hope the Dasher would go 4,000...if not, the trade-off for extra 100 fps simply would not be worth it at all!