I’ve used IMR-4198 in the 350 Mag with the 200 Hornady RN to try to get down around 35 Rem ballistics. These are based on an old Remington/Dupont Reloader’s guide and I got the following:
39 grs = 2190 fps
40 grs = 2200
41 grs = 2285
42 grs = 2320
43 grs = 2350
I had hang fires at 39, 40 and 41 grs; none at 42 or 43 grs. Slightly “disconcerting” to say the least 😮 Cases were at least slightly smoked at all levels.
Although it’s been discontinued, I got more consistent velocities and accuracy with IMR-4759 and the 200 Hornady RN. No hang fires at any level. These are based on an old Remington/Dupont reloader’s guide as well.
31 grs = 1885 fps
32 grs = 1910
33 grs = 1951
34 grs = 1995
35 grs = 2055
36 grs = 2100
Fired on another day starting at the previous level of 36 grs to check higher charge weights:
36 grs = 2185
37 grs = 2235
38 grs = 2285
39 grs = 2330
