Oleg;
OK, now you are in my territory <s>
Range and effectiveness- the simplest comparison I can give you is this.
The British Brown Bess musket, which was the most effective military weapon of its day, has a range and accuracy that is very comparable to a modern 12 ga shotgun firing slug loads.
The troops were issued undersized ball to facilitate loading when the bore got fouled, as in an extended firefight, usually about one or two gauge sizes smaller than the actual bore size.
That coupled with the fact that the Brown Bess didn't have a rear sight, makes the comparison with modern shotguns even more valid.
It was generally conceded by tacticians of the time that a lone man standing erect and standing still at ranges of over 100 yards was reasonably safe against a single armed man.
The velocity of modern shotgun slugs is quite close to a full charged musket also. So anything you can shoot thru with a slug, is vulnerable to a Brown Bess also, I have not actually fired one at antique breastplates, etc. as they are too valuable.
There are plenty of chunks of plate armor hanging in the Tower of London. the ones that were made as firearms were coming into use have been "proofed" by firing at them with some kind of a contemporary gun, the dent was left in the armor as "proof" to the prospective purchaser that the outfit would indeed stop a bullet.
That said, firearms made armored knights obsolete in very short order, so I guess it was really "no contest"
As to calibers and bullet weights, they were all over the charts, however "more is better" seemed to be the rule.
The Brown Bess was very close to todays 12 gauge in bore size, and the undersize ball that was issued was close to a 16 ga- or one ounce in weight.
The British standard Navy pistol was a 20 gauge, as was the carbines issued to cavalry. They were actually about 62 caliber and used a 60 caliber ball, the weight of which escapes me at the moment.
Black powder velocities were also very close to modern shotguns, figure 1,200 fps- tops- with heavy charges.
The pistols got about half that, but 300 grains of lead will make a very serious wound at 600 fps.
Jim
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Lay up some blackpowder and flints
The rest we can build, if need be