I don't know why they went to a 1-14 twist in the 504HB. Most target barrels are either 1-16 or 1-17. I suppose some may be 1-18 but would probably be special order. I'm not sure that it's worth the expense of a new barrel if you're shooting Wildcats anyway. Also, you might have trouble chambering a bulk cartridge like the Wildcat, in the Eley match chamber. With that gun you need to be looking at match ammo unless you're just trying to break it in. Then a Win. Power Point or equivilant would make more sense.