Rowan now has the single loader to fit the Wolverine B-Lite in .25 cal. Just got one today, really like it, so far. Works real nice with the 25 grain jsb the 33 grain fit a lit tight, but do work.
You should email them, to let them know you are ordering a .25 cal., sort a heads up. When you use their order form, on bottom make a note in comments that you need a .25 cal. I have been bugging them for a year to make a batch & they did.