Gary,

Thanks for taking the time to post this. All interesting stuff,

I'm still looking through my library for what the powder company recommended but with little luck.

Richard,

I think the reference you are looking for is in 'The American Rifle" by Whelen Page 326-328 regarding the corrosive effects of Lightning powder.

If that's the one you might then skip over to page 398 "The Mann-Niedner Chamber" and read why I would use it in this rifle.

MP Sadly Deceased as of 2/17/2014