Sinner,

I am the one who posted about shooting a 22 for practice. It does work. Just to make make this obvious, I'll ask this question: When was the last time you shot 120 rounds of 470, or equivelent in recoil, out of a rifle in ONE range session? (100 rounds of 22lr, 20 of 470)

The answer will be never, or suspect. Trigger control is all, and it can be learned on any rifle. But of course needs to finished up on the rifle you intend to hunt with, and that doesn't take much.

If you want to practice the function of your double rifle then go shoot skeet or sporting clays with your SxS shotgun. Speed of reloading too. Mount and point, similar.

A flat of 12ga shotgun ammo (250 rounds here) doesn't cost too much, is fun to shoot and doesn't beat you like even 50 rounds of 470 would. Importantly, it teached fluidity, which much rifle shooting does not. Fluidity is the key to close range shooting imo, especially when the ele swings to look at you as you push your approach, or the buff for that matter. If it doesn't notice you as you close to,say fifteeen or ten yards - and they all will if you keep approaching to close as close as possible, then your long practice with a 22 and then with your 470 or so will make a set shot a breeze.

JPK