Can't find a picture right now - but he makes them what they should be - full detachable Mini 14 mag, fluted match barrel, shortened lever throw, Picatinny rail. Sweet as a nut - the lever action for the 21st century He does the same with Enfields - detachable box mags, modern calibres, cock on open bolt etc.
Google "Armalon" for piccs of his stuff
Red, sounds quite a bit like what AIA in Australia are doing with their Enfields in .308 (uses M-14 mags) and 7.62x39mm (uses AK-47 mags). Unfortunately, those are commonly for sale in Canada, but not in the USA. There was a US importer, but they quit due to high cost vs competition from semi-auto makers. It's ironic that in Canada with their wacky and restrictive gun laws they can get some neat guns there that we cannot get here, such as a wide range of Norinco weapons.
I like what Armalon is doing with the Enfields in 5.56mm with Mini-14 mags. About the closest thing to that here is the Mossberg MVP Patrol rifle in 5.56mm that uses AR-15/M-16 mags and their .308 that uses AR-10 mags. Remington for a while was making a 5.56mm carbine version of their 7600 pump action called the 7615 that used AR-15 mags, but there is mixed feedback as to it's out of the box quality without work being done to it.
When using blackpowder in a cartridge, it's almost impossible to overload it for a modern firearm. Blackpowder only has 1/2 to 1/3 the strength of modern powder, depending upon the modern powder it's compared to. However, there cannot be any empty space in the cartridge case with blackpowder, because then you could have catastrophic results. Blackpowder in a cartridge case is loaded by volume, not weight. General rule of thumb is you tamp it down into the case, and seat the bullet so it compresses the powder slightly. The old time buffalo hunters would cast their bullets in camp and reload their cases by tamping the powder down progressively in stages with a wooden dowel.
This is why cartridge cases from the blackpowder era (such as the .45-70), and those cases with ancestry in that era (such as the .30-30 Win) tend to be straight walled or with long, shallow, sloped shoulders.