Originally Posted by
lightning22
My No.4 Mk1 has a five groove barrel and I pretty much only shoot powder coated cast through it, I did have issues with leading until I got the lubes right, and in the case of the powder coating, allowing it to harden for a week or so after coating before shooting.
16gn of 2400 gives a lovely soft shooting round that you could send down range all day, a box of 50 costs about the same as a semi decent box of .22lr and the brass lasts forever.