Strawhat,
Sorry to be so long in answering. Been so long I didn't think there was anyone interested in discussing this further so didn't look in till now.
I'd be happy to share what I've found out, but you do realise that YMMV due to differences between guns. My gun is a Win. Low Wall with a Shilen barrel with a 1-10" twist that is throated especially for breech seating and target shooting, but which I also use fixed ammo in for Squirrel hunting. So what I'll going tell you might not work well in your gun but should give you an idea as how I do it. Also as I mentioned in my last message I'm actually using a .22 Hornet, which other than bore diam. is the same thing as the WCF.
The load is 13.6 grs. of 3F Goex in a WW case. The case is important since with this small of a capacity different brands will change the volume a couple of tenths and this will change the whole dynamics of the results. In the lot of cases I use this will fill the case almost to the top, with just enough room for a wad. That's one I make out of .025" milk cartons. This is compressed to a depth to allow for seating the bullet. Rem. 7 1/2 primer and a 60 gr. Lyman 225415 bullet. SPG lube. OAL - 1.870". After trying several different amounts of crimp I found that .010" worked the best in my gun.
Since I don't know how you're going about loading for this small of a caliber I'll point out a few things that you might already know. Changing the powder charge .1 gr. will make a difference in performance. This can easily amount to 50 fps difference in MV. When you change lots of powder you will have to do some adjustment in powder charge and compression. What I usually tell people about working up BP loads is to start with a powder charge that will just reach the bottom of the wad/bullet when you have your bullet seated to just touch the rifling. From there you, in this small of a caliber, change the charge .1 gr. at a time till you get the smallest groups. Then, of course, you can play with the compression, primers, OAL, and in this case, the crimp to fine tune the load.
This is not going to be an easy thing to do. It took me shooting 5 days a week for two solid Summers to come up with what I've written above. But I was looking for the best possible accuracy I could get at 200 yds. fo breech seatedr target shooting. The fixed ammo end of it was more or less incidental. So if all you want is something to plink with or hunt Squirrels you can probably stop far short of the work I put in.