I just loaded a few and got a velocity reading. I'm sure they'll be plenty accurate, I've shot the 220 Hammer and it shot half minute angle in my rifle
I'd bet the farm on it.
35 Whelen, Norma cases, Federal 215 primer, 67 grains of Power Pro Varmint, Hammer HHT 215 grain tipped, shot from 1885 Highwall, 28" barrel
3037.5 FPS
10mm Sig P220 Legion 5" barrel, 180 grain XTP on left, 180 Nosler on right. Shot into 20% Clear Ballistics Gel. Both loaded with 9 grains of Longshot. The XTP averaged 1295.1 FPS for 5 shots. I have not chronographed the Nosler as of yet.
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