If I was going to get a DR in 45-70 I'd like to have it regulated for a traditional 350 grain bullet, eg hornady RN interlock, north fork or woodleigh. The 325 gr leverevolution isn't that flexible at all in my opinion. Don't know what pressures a modern o/u heym could take, but my own 350 gr loads for the marlin 1895G are close to 40000 psi - perhaps the heym would fix that too?

On the other hand- i think the good old 45-70 is best suited in a side by side rifle. If I was to buy a heym 26B I'd rather choose one of the fine 7, 8 or 9,3 mm cartridges.