Need a bit of info about the older R-P and Western Super X ammo…

I am shooting the 30-40 Krag in a custom MGM barrel on the Encore frame…

Very good accuracy using the N.O.E. 311-202-RN (~210 grains) and a compressed charge of WC-872.  This powder has a burn rate equal to or slower than H-870…

I now want to shoot some jacket bullets from it and I pulled the bullets on a R-P and a Super X factory round and found the bullets were 180± grains and the powder charges ranged from 43.8 (Super X) to 46.8 (R-P) grains…

I then looked in reloading manuals—old ones from the ‘60’s to the new ones and charges that fall in the area of the previously mentioned would indicate a burn rate in the neighborhood of 4350 or 4831.  QuickLoad verifies this also…

Many medium burn rate powders are also listed in the manuals, but the charges would not be near the ones in the factory rounds I pulled…

So, my question is:  Does anyone use the slow burners in the burn rate of the 4350’s and the 4831’s to load jacketed bullets from 150 to 200+ grains?  It would seem this was the selection of the factory people many years ago—well at least in the 1960’s or thereabout…

Thanks…BCB