Fine shells BUT IMO- better suited for a modern era gas operated autoloader- A 1905 DH 12- the chokes were honed out and Briley thinwall screw in chokes installed, correct? But your fine Parker was built when paper shells were the norm, we were slowly moving from black powder into the smokeless powder shells- older style primers, waddding, crimps and possibly 2 &5/8" chambers.
I concurr with brother Lester about recoil and the wood at the critical stock head area- I'd stick with my favorite combo in my 12 GHE No. 2 frame Parker- 28" Imp. Cyl. and Mod.-- I use a 1 & 1/8th AA std. Trap load (not Handicap) 1150-1200 FPS range in the right barrel, and the same load in the left if shooting over a close working tight holding pointing dog- if over my Lab or with another friend with a flush dog, then I use some of my older Rem Express paper 1 & 1/4 oz. No. 6 shells in the left barrel.
What choke combinations do you plan to use in the DH with the Brileys? Kansas birds in Dec. snowstorm- I've heard that real cold weather may affect shotgun shells- but I have no direct knowlege of that.
Have a good trip- hope you get into some birds- maybe some fotos afterwards with the DH 12 as a "bonus"??
