remember a german jaegerrifle on the british militaria forum - Bore 0.527 Grooves 0.547 - with a tige breech.I asking freddo, the owner of this nice rifle again about the powder load:
"I never did determine the exact amount of powder to use.
I put in 60 grains swiss 2f This seems to cover the tige,I am using a Wilkinson/Lorenze type bullet so I do not need to ram the bullet down on to the Tige to expand it.
I think the right amount of powder to put in would be about 55 grains.
Best Regards"

Fuhrmanns rifle hold only 40 grain's but this rifle with 55 grains isn't any better.fortunately we have such examples where its possible to determine the powder load.I will say that this was the rule in continental europe between 1850 and 1870. the german-french war from 1870/71 have bringing a great attention for ballistic questions. superiority from the 11mm chassepot rifle with 86 grain's powder over the 15mm dreyse rifle with 73 grain's was to clear. I believe it was the turning point when everyone starts to think about this problem.