I've had pretty good results using IMR 4350. I've not tried the H4350 yet.

I use 63gr of IMR 4350 for 250 older ballistic tips and the new AccuBonds and for the 270gr Speers. I actually gained very little by loading 63 grains over 60 grains, and I found almost no difference between 63 and 64 grains with either bullet.

Pressures seem reasonable, and brass lasts a long time. I do use a magnum primer. All four rifles tried had 24" barrels, except the CZ with a 23.6". My average velocity for the 63gr load with 250s was 2,560 with my present HusqvarnaStyer 98 Mauser hybrid running around 2,600. The 270 Speers were at 2,440. It surprised me that the Speers weren't a little bit faster.

I just got some R-17 and am anxious to try it with 250, 270, and 286 gr bullets. My best accuracy powder has been R-15.

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