TM45-- The following load works GREAT in my .17 Remington with its 24" fluted stainless steel super match grade Pac-Nor barrel with a 1 in 9" twist and 3 grooves. My Pac-Nor barrel has a .1945" neck and all of my casings are neck turned. The outer diameter at the neck for my loaded rounds is .1915"--give or take a 10 thousandth!!!
My gunsmith did a fancy scroll design on the barrel.
As always, if you want to try this powder, start with a charge about 5% or so lower than my load and work up slowly.I am using 22.0 gr. of N-135 with this 25 gr. V-Max bullet and the muzzle velocity is right around 4,080 fps. A load of 21.8 gr. of N-135 also gives me tight groups and average velocities around 4,030 fps.
Another powder I tried with the 25 gr. V-Max was Varget. A load of 24.3 gr. of Varget gave me an average muzzle velocity of 4,030 fps and a 3-shot group that measured .318". The ES and SD numbers were quite large though, but I might do more testing with this powder.