Methinks, no proof or documentation, that many of the old timers flipped the revolver up and back when cocking, to throw off the spent cap. I did that for years with my 1860. It worked. I don't think canting the revolver is as effective. (and to me, looks kind of dumb) Certainly not as dramatic as bringing the revolver up and back, but that of course would horrify the range-officer. In the wilderness or my back yard, there is no range-officer. However, a cap-post and action shield will solve the cap-jam problem, even if hammer blow-back is the main problem.
As far as modern primers, back plates and firing pins, why not just shoot a cartridge gun? That, to me, seems like re-inventing the wheel, but making the wheel square...or octagon. And making it ten times more complicated. I have come to believe, but may be wrong, that very tight fitting caps, and lube over ball will prevent any chain fire. As Hawg as mentioned, and also makes sense to me, a bullet with it's long bearing surface and lube grooves will also stop chain fires from the front.
