I can't find my 43-215 C file but it can easily be pushed over 1300 fps. with Swiss III in Starline brass.
I quickly tried out the 43-230 E and prefer it. My guns prefer OE III and are most accurate shooting the 230 in the 1250s. Depending on temperature, 34.0 - 34.5 gr. of OE III will accomplish that.
It got so dry last summer that I about sucked all the oxygen out of the air blow tubing the Henry. So, I hate to admit it, but I quit the black. But don't worry, if it ever rains again and puts some moisture in the air, I'll be making smoke.
In the meantime I've been shooting the 43-245 GC & the 43-252 K with RL7 & H4198. Those two really smack the 200 M chickies.
Billy
PS. I see that last May, 34.6gr. of OE III drove the 43-245 GC 1251.7 fps with an ES. of 23.4, SD of 8.3 and shot all 8 in 2.8" @ 100 yards. 75 degrees, 16 humidity.