I had a local, well-trained gunsmith use a 6.5x55 match reamer from JGS on a 30" Krieger medium Palma blank for my Nesika K prone rifle back in 2002. That rifle shot really well in the 'any rifle' Palma-format matches I used it in, usually shooting Sierra 142MKs at 2900fps with N165 in Lapua brass. Years later, after I'd started doing my own barrel work, I was looking at the Ackley Improved version of the Swede, and wound up buying a AI reamer for use on a switch bbl BAT 3LL action prone rifle build, doing 30" hvy Palma barrels in both 6.5x55AI & straight 284 Win. I never did shoot the 6.5x55AI bbl in any of the 1000yd prone any/any matches I shot out at CRC near Byers, Co, instead preferring to go with 180VLDs out of the 284 bbl. But in both that rifle and another switch-bbl Bighorn tactical rifle, the 6.5x55AI bbls have shot quite accurately with loads that run not that much faster than the original Swede - and I don't have to trim brass after every firing like was necessary with the original Swede with all its case taper.