Playthe blues try this, but wait till after you get .454 ball...shoot it with them first. Then make a call on the sites. Them .440 ball was a jus' bouncin' round in there.
Here ya go this is Oldelm's idea I jus' have the copyright privilages:O)
Brass Rod or I suppose Copper a hair bigger than your site. Cut the inside and outside to fit as an extention over the existing site(below)
install soldered and file/sand finnish it, adjust as needed.
Compliments of an
http://voy.com/60048/ member "Oldelm"
SG