The 218 Bee was never a wildcat as per se, but rather a Winchester adaption of the 25-20 for their lever rifles they commercialized in the 30's or 40's. So Parker's referral to them probably would be for the wildcat he designed from them.
I've had a couple of 218 Bee 10" Contender barrels, and mostly shot the Winchester 46 gr. OPE's in them with H4227 or IMR4198 powders. Got about 2600 fps out of them. You'll get more in the Martini, a great platform for the cartridge IMO. My rifles and carbines based on this case were all 17 Ackley Bee's though, a fantastic little wildcat. Ought to be plenty of data in the reloading manuals or at the on-line data sites for the 218 Bee pard, just look them up.