Whatever charge of H4831 is max for whatever cartridge you shoot, add 1 grain and that'll be within a half grain your max charge of Superformance. I've used the powder extensively in several cartridges from a .22x47 Lapua wildcat to the .375 Ruger and only had a couple guns it would group in. It DOES give about 100 - 150 fps greater velocity than 4831 in most any given cartridge. It is slightly slower burning than 4831, but not quite as slow as RL22, 23, Win 780 Supreme, or N165. It is best suited to cartridges of medium - large case capacity in relation to bore size that generate high chamber pressure. For many bullets in cartridges such as the .280 Remington, .280 Rem AI, 7mm SAUM, .300 SAUM, .300 WSM, .300 Win Mag, .270 Win, 6.5x284, 6.5 PRC, .25-06, .257 Roberts +P, 6mm Remington, .243, 6mm Creedmoor, .220 Swift, .22-.250, and WSSMs, it may be ideal. And it can certainly be used in the 338 Win Mag and .375 magnums, as well, though probably better suited to the 375 RUM vs the H&H. I ran out of space in the hull of the 375 Ruger before I reached max charge with my trials there.
It is advantageous where you have a powder like 4831 (spp.) and are having better and better results the more you add, and then you run out of case capacity. It is a fine ball powder, and the ONLY fine ball powder in this burn rate range until you get to Win 780 a little up the chart. Therefore you can get more inside the case. Cartridges like the .270 Win, .280 Rem and .280 AI, and 6.5x284 may most especially make use of this.
And no, there isn't much published data, but if there was I wouldn't know. I make my own data from range trials with new powders and new bullets over months and years. I have yet after 20 years to have anything damaged from "wildcatting" loads. Just today I used IMR Enduron 7977 with Barnes TTSX 180 grain bullets, 180 grain and 200 grain Woodleigh Weldcores, and 4000MR with 165 Sierra Game Changer in guess what? A new .300 Dakota by Mesa Precision. I shot the eyes out of the 1" Hi Viz sticky dots and generated as much as 4700 ft-lbs of muzzle energy in that cartridge WITHOUT ONCE having an issue with pressure. I used other powders, too, BUT I consulted my notes, not a manual or "official source" at Dakota or the powder company or anywhere. If you're not confident enough to try loading anything without a "published" load (which is going to be lighter than true max in many cases anyway), no way you should attempt it. You have to know how to properly adjust neck tension and use graphite (dry) lube on the case necks, and in some cases which bullets will reduce friction the most. After a few years of doing it, you learn the intimate characteristics of certain powders, bullets, cases, primers, and cartridges as a whole. I said all that just to point out that just because there isn't any published data on a particular grouping of components, doesn't mean they should not be combined. SOMETIMES IT DOES, HOWEVER! Like DON'T use N530 and faster in a 6.5 Creedmoor. Just don't do it! You won't find published data for that and there is a reason. It's highly unpredictable and a LITTLE change in volume can get you into A LOT of trouble. I used Reloader 7 very successfully in a 243 with 80 grain GMX bullets for a friend's 6 yo in his 1st deer rifle (Marlin XS7). Not a powder you'll probably find data posted for under the .243. I've gotten to where I see an odd or new powder and decide it's perfect for some niche I need filled under certain conditions. For instance, LeverEvolution and CFE 223 are 2 of my favorite powders of all time for the 6.5x47 Lapua, 6.5 Creedmoor, .308, and 375 Ruger! Probably not much data on those powder/cartridge combinations.
Let me pull my notes and spreadsheets and I'll give you what I can find. I know there is much lost data that was thrown away before it was recorded. If anyone wishes to ask me about any specific powder/cartridge data, feel free to message me.
