I just finished my first 6mm Dasher barrel, it was a Lilja, 28" medium palma chambered with a Lapua no-turn neck and a .126 freebore. It went to barrel heaven with about 2300 rounds, they were almost all fired long range slow fire prone with 108 Grain Berger's and 32.5 grains of Norma 203B with either Tula 556M or BR4 primers. My very accurate chronograph of my loads showed a very consistent 2915 FPS before it's last match. SD's with the BR4's were 3 and the Tula's 8. In my last 1000 yard match I shot a 1155-30X or .9625%, knocking on HM, but not quite enough. My X counts have been going down since about 1500 rounds, and I have been mining copper from the barrel since it hit about 1800 rounds. Why am I reporting this information? Searching how long a Dasher barrel should last is a crap shoot, I'm not challenging other claims, different bullet and powders, etc. change each equation. I have no basis for that but, I feel that I can give you an accurate report of how MY barrel and load performed. I'm sure that it could still work at 300 or maybe 600. My last 300 yd. string a week before that LR match was a clean with 12 x's. But at 1K, issues show up for sure. Borescoping the barrel shows a very jagged rocky throat, lands and grooves have multiple cracks in them going about 3 inches up the barrel, from there, cracks continue, but much less. I have two Brux heavy palma barrels ready for the gunsmith, I may have my barrel set back and use it for messing around or forming brass. It was a good barrel, we had fun, shot with nice people and made some great memories.