I went to IMR8208 in my 17, 204, and recently 223. Accuracy is outstanding and velocity in the 204 with 35gr. and 37gr. hoovers around the 3900fps. The Labradar would not read the 17 cal. since ours will only read up to 3950fps. I haven't checked the 223 loads yet. All three rifles are 22" barrels.