I'm in the process of acquiring a 45 cal Seneca, and can't seem to find a hotshot nipple for this rifle; doesn't appear that they make one for the Seneca. Any advise as to what nipple works best? Also wondering about powder selection. I've searched and read some post, opinions seem to vary between ffg and fffg. Thompson's load information lists ffg for the 45 Cal; any reason I couldn't use fffg with a maxi or a prb?