The Wolverines if in good condition are worth $100-$150 on most auction sites. Shoot 85 grains of loose powder and use a #11 cap and I think you will be more then glad with the way the rifles shoot. I personally would not convert them, but if you feel the need for blow more fire into a breech plug, then have at it. I never had a #11 fail to fire the rifle yet with loose powder.