I have my 25 Krag AI barrel and am forming brass for it. I am getting about a 50% failure rate even with annealed cases. I noticed that the neck length criteria for each cartridge is 1 caliber - thus .308" for the 30 US and .257" for the 25 Krag. I had been sizing the necks the full length, or .308". The next bunch I'll size the necks down .257" and see if I have the same failure rate.