Back in the 70s I built a CVA .45 Kentucky percussion. Used it a bit but then got into archery. Bringing it back to life now. But, I read up on all the advances in ML and made some changes. I got one of the new 777 powder and a nipple that uses the shotgun primers. When the trigger is pulled it goes 'Boom" really nice. I also got some Hornady .45 sabots as I succumbed to the ballistic improvement over round balls. So, I shot it today for the first time. In the pursuit of speed I used 100g by volume. The bullets did hit the target at 25 yards but they went through sideways. Would make a really big hole in a deer at that range, but accuracy might suck.

My question is do you think I used too much powder and need to cut back? Why else would it tumble like that?