[mrkirker]

First of all, "Welcome!"

Sounds like very poor quality control with the pour temperature of the lead too cool, and air-voids in the rounds, to boot!

You might want to size your bore to insure that you find the correct round before you seek your next rounds. You'll want your rounds to have been cast of very, very soft lead. You didn't mention your powder load and type you were using, which can effect your accuracy, as well. The Enfied was the 'assualt weapon' of it's day, and can be a very accurate musket with the correct round & powder charge. What brand of 're-pop' musket did you purchase?

Really, the best method to fire the correct round for your musket is to cast your own, but doing so is a bit of a hassle, and might be more trouble for you than you want to undertake. However, RCBS and LEE (among others) offer molds for the Enfield.