John:

Not being in Canada either, I'm also at a bit of a disadvantage. Based solely on what I hear through the grapevine, I'd probably call Nick Makinson. He has built DRs in the past, so he should be should be capable.

Yes, the Federal 215 is generally considered to have a soft cup, which is why I use it for large bore DR handloading. If there are no problems with the gun or load, they'll function fine.

Even when using pressure tested data with the same components, you're still poking about in the dark some when handloading the large bore DR rounds. Because max pressure and proof pressure are so low, you can't use conventional pressure signs as a guide. By the time you get them, you're well beyond proof pressure. The hope is that the softer cup will give you earlier warning, albeit definitely belated. Better late than later.

I've shot Norma in other flanged DRs, but not .470. The good news for the .470 may be the rumor that Hornady will be releasing new factory ammo at SCI in January.

Woodleighs are the proper choice for that rifle.