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DoubleSS - the product to resolve blowback shooting 45's with BP is ... The Lee Factory Crimp Carbide Die!  And a hard crimp!
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Been shooting Cowboy Action for years, using 45 Colts with BP ... thousands of them.  Using the Lee die - my spent cases have a smidge of powder marks from blowback.  My loads are 35gr FFg and 250gr - 454's.  Use a soy wax based lube and you'll have to do less patching for good 100yd shot accuracy

Would also recommend using 454 bullets instead of the 452's.  They seal the chamber better and are an additional plus to reducing blowback

An example of easy ejection - when I dump the cylinders of my Ruger Vaqueros - I just tap the bottom of the pistol grip on the unloading table and the spent cases - fall out.  Well, some times there is a stubborn one and the ejector rod pushes it out easily   As for rifle ejection - all my levers have NEVER had an ejection failure.   

Here's the update on the replacement rifle ...   All the lands are "throated" properly, and 95% of the time the extractor pops it out and the spent shell can be pulled clear with my fingers or, once in a while, it tosses the spent case out all the way. 5% of the time I had difficulty extracting the case but that was due to exceeding the "no lead" limit. A round or two of jacketed or copper plated at lower speed would then clean-er-out and it was good-to-go again.

The Uberti High Wall has a 1-in-18" twist and is particularly prone to leading as opposed to my Puma 1892 (also 45 Colt) with its 1-in-30" twist. I wonder why their twist rates are so dramatically different? Don't be confused .. the first High Wall had a stuck-case issue with any loading.

So again, I thank you all for your thoughts and comments. Meanwhile, I'll ponder the situation but for now I suspect the real culprit here was the errant barrel throating.

John Boy .. The leading occurs just forward of the chamber, in the barrel's throat. I'm aware of the cause of that situation which is why I'd clean'er out with a reduced load of a copper plated or jacketed bullet.

I've read your comments on the .454 bullets with interest. I'll try it but I suspect the pressure profile for BP is different than that of the TiteGroup powder I've been using.

I believe I'll use my lead bullet loads on the 1-in-30" 1892 and use jacketed or plated bullets for the 1-in-18" High Wall.

David .. It's a .452 bore .. The Uberti 45-70 High Wall has a 1-in-21" twist. But you make an interesting point relative to reamer being off-center. I, myself, have been off-center for many years now .. just ask my wife.

Funnily enough, it seems that many manufacturers use non-piloted reamers for faster production. It was hard for me to believe at first but over the years I've seen entirely too many off-center factory chambers and so now I've become a believer. Bah.
Regards, Joe