You can forget .44 or .41 magnum performance in the ROA.
Well, this falls under the category of "I wouldn't do that, if I were you...,". Here's why.
An all lead .457 round ball is about 145 grains, and with 35 grains of 3Fg will give you about 1200 fps at the muzzle from the ROA (I checked a load chart for the ROA for this info). Not bad on a whitetail, but that's like a 90-130 lbs. out here. Even a really large buck at say 140-170 lbs. isn't as "dense" an animal as 200 lbs. of boar hog. I don't think the all lead will get it done, so you're talking say wheel weights, and 139 grains.
So if you go to a 200 grain conical, and 35 grains of 3Fg, that will give you a bit over 1000 fps, and a 250 grain conical will give you just under 900 fps with 30 grains of 3Fg.
I guess if you got right on top of the animal, you could get the job done, but I was taught that boar have denser bones, and so you would need a perfect shot, and to be right on top of the bugger..., and being right on top of a boar is not what I'd say is a good idea... backup guy with a rifle or not :shocked2:
Now the .357 with a 158 grain SJSP will give you like 1200 fps and 180 grains SJHP will give you 1100 fps. If you look at the bullet weights, and the velocities, you see they are in the same range as round ball and 200 grain loads for the Ruger. So if you have been told that a .357 would be "marginal", then you are looking at pretty much the same energy, though a larger hole, as the above mentioned .357 loads..., and the .357 is going to give you better penetration.
The 250 grain loads are going to give you .44 special/.45 Colt performance, not magnum performance. So if a .44 special would also be "marginal" then I think you are out of the realm of using the ROA.
You really need that 210-250 grain slug and about 1200 fps or faster, at least that' what I would be looking to have as a minimum in a rifle or handgun going for boar, and that's like .41 mag or .44 mag performance. I'd also be using wheel weight alloy if I was using my flintlock rifle, to ensure deep penetration.
LD