Thanks for the information.I'm planning on getting a 1895GS 45/70
In the blued version,I've used a maximum charge of 42.0gr IMR4198 and a Hornady 350gr flatpoint JSP.With the Williams receiver sight,I sight in for +3" at 50 yards.
I have a disinclination towards proprietary brass/cartridges[expensive,hard to find],althouggh when WWG said one could also use standard 45/70.
The extra $300+ feels a mite steep for the extra performance from the conversion.