I checked my chrono sheets for my 10.5 X 47R and the results are; 62 grs. of Schuetzen Fffg under a 260+ gr. bullet for 1379 fps. I also checked the sheets for my old 1886 in 40-82 WCF. 34 grs. of IMR-3031 with an open cell foam filler under a 260 gr. bullet gave 1448 fps. For all intents and purposes no critter is going to know the difference in 69 fps.

Yes, the 40-82 is a 2.4 in case and no, the 10.5 X47R was never a smokeless round, not to my knowledge.

Stahl does mean 'steel' in German. Reinhard Stahl is also the developer of the X47R cases. My last name is German and translates to 'shearer of sheep' and to my knowledge none of my family has sheared a sheep since we left East Prussia in the mid-1800's.

I recently worked up brass and loads for the 9 X 38R Tesching. Surprising to me that case has a smaller version of the Mauser "A" base. To achieve headspace a friend at church 3D printed some O rings to the dimension I gave him and I slip them on up to the front of the rim. I tell ya what, it works wonderfully and I don't yet know how many firings they will endure. To be certain, it is a low pressure cartridge shooting only 28 grs. of Fffg and a 170 gr. soft cast bullet. Accuracy is surprising at 50 yards.

I can't imagine a similar o ring set up wouldn't work on the re-formed 45-70 case for the 10.5.