Howdy Mason,
I'm shooting Rossi 92s for lever gunz! One is my .38-22 (.357) and the other is in .45 Colt. I just acquired the .45 recently, the previous owner was frustrated by the blowback in his BP loads. I have very little, if any, blowback with my loads. I use WW brass and put a card wad under the slugs. I don't have any idea why but the addition of the card wad makes a huge difference in blowback for me.
In an aside, I loaded a bunch of brass last night and paid attention to the amount of force needed on the press to resize the different brands of brass I was using. It surprized me!
WW brass seemed to take the least amount of force on the lever. However I'm talking WW headstamps there! RP brass was next up for least amount of force used, The brass stamped Winchester took much more pressure on the lever, followed by a Starline which was VERY pronounced in needing a lot of muscle on the lever!
Not very scientific, I know, but thems my observations! I was very surprized by the difference b'twixt "Winchester" and "WW". Maybe one of the two headstamps is from a contract supplier for Winchester?