I have a T/C Contender in 45/70 with a 10" brl. It is Not fun to shoot with factory loads. How mild can I load for just fun and plinking with wither 300gr or 405gr. Lead bullets? Do people still use a filler like Dacron in large cases using small powder charges to take up the extra space and keep the powder near the primer? What powder would be best for light loads in a short barrel? I don't care about velocity out of the short brl. 800 pr 900fps would be fine for me. I am looking for loads even milder than the avaiable Cowboy loads for the 45/70.