QUOTE (Wounded Ronin @ May 10 2015, 08:33 PM)
Haven't specifically done this but thought about it. Chief difference is soft lead bullets (instead of FMJ) and lower energy black powder rather than smokeless powder. Basically, if you want to keep it simple you could reduce Power significantly across the board and reduce range by a certain percentage.
Within effective range, the blackpowder weapons are accurate if they're rifled. See if you can find footage on YouTube of "Cowboy Action" competitions where people engage a variety of targets with historical blackpowder weapons. You should see that the accuracy isn't terrible.
I think the techniques were less advanced or different which might lead to less accuracy than today in some situations but it may not be worth it to implement this in game. Old revolvers were designed to be held one handed so you can't use a modern revolver grip. (Tried it on a cap and ball revolver). However the old revolvers sit very comfortably in one hand. Your modern accuracy and stability might be reduced by the one handed style, but the one handed style was better for firing from horseback.
I would say one of the biggest differences is less reliability. Old blackpowder weapons are less likely to fire when intended. Maybe make all glitches be a failure to fire or something like that.
Fanning a revolver should probably allow a semi-auto burst, but at a substantial penalty.
And glitches as failures to fire sounds great. For some weapons(like the Colt Dragoon, if I remember correctly), a critical glitch should probably be the gun exploding in your hand. They did that sometimes.
Also, shotguns! 10 gauges are remarkably more common in a 19th century setting. So, the shotguns should actually be MORE powerful in comparison to modern shotguns. I've never been a fan of the double recoil rule for shotguns, personally. Well, I was when I was 16 and had never shot one. Now, I shoot them all the time, and the recoil isn't really that bad(substantially more than my AK, but not really that bad), and I tend to do a lot of rapid fire drills. Firing with one hand isn't even a big issue(though I do keep the stock tucked into my pocket, and just remove my weak hand, rather than holding the shotgun like a pistol).
Slugs don't exist yet. Well, I mean, people can cast their own, but there's a reason they called'em punkin balls("pumpkin" balls): they're basically just balls of lead, and accuracy should be comparable to any musket(which is to say poor). And without sights of any sort better than a bead sight, you're just basically guessing. Within 15-27yds, you might be able to hit a target reliably(I can use my bead sight to put a slug into a paintcan at those distances, but caveat: modern rifled slugs are a damn sight better than punkin balls), but past that, good luck(There's a reason I put a red dot on my mossberg, because I like shooting slugs at 50-100yds, it's fun to blow up things).
A field expedient slug can be accomplished by scoring the case right behind the wad, so that when fired, that portion of the shell containign the shot breaks off, and flies as one body. It's a reasonably reliable way to get a slug, and it's superior to a punkin ball. Back in the depression, folks were still using carboard hulled shotgun shells, and using this method was useful in the great depression for people to be able to hunt a variety of prey without having to make their own punkin balls. Also, you can open up the shell, dump the shot out into a bowl, melt some wax into it, then spoon it back into the shell and reseal it. The wax will hold the shot together as a solid mass until it hits something. Maybe give punkin' balls a -2 dice pool modifier, and scored or waxshot a -1 modifer.
How was shooting a cap-n-ball colt? I hear they will shoot as fast as lightnin, but ya load'em mite slow.