Henry: here is a listing of the Gamebore loads, with shot weight, fps, and psi. Please keep in mind the psi is reported by CIP rather than SAAMI testing, and is actually about 500 psi higher than reported. Also, British shot sizes are smaller than the equivalent US shot-Brit 6s are sorta US 7s. http://firearmservice.com/shopsite_sc/store/html/page19.html You're likely to be using 1, 1 1/16, or 1 1/8 oz loads, all of which should be fine. Sounds like a wonderful trip, and please post pics after you return of your Smith showing the Brits 'what for'