I don't shoot smokeless in my BPCR but I see posts that smokeless dont obdurate a cast bullet. Well I spend a lot of time in the winter shooting bullets into snow banks to see what alloy works best in different calibers I use so I loaded some with 5744 with 1/16 alloy patched bullets at bore diameter that I normally use.
The left bullet was a 1/20 alloy the other three were 1/16.