So I found a local supplier of #10 CCI's and hurried home. Installed the stock nipples back onto my Walker and ALL but one accepted the #10's. Would you believe that one nipple is STILL just a hair to small for a #10?! I little pinch and she stayed put. All cylinders dry fired with a resounding CRACK!. My Dragoon takes #11;s and one was still to big. Placed it into my drill press, very carefully used 120 grit to take it down and she is good to go. Gonna see if TOW will take back the nipples I bought for store credit or something. Don't have any use now for these huge bronze things.
Thanxs to all for your help. I love this forum and this sport...