BAD, bad, bad, idea!
I'm sorry if I come across as a bragging blowhard, but I don't know how else to get peoples attention quickly on this subject.
I seriously doubt you will find many people that have fired the THOUSANDS of rounds of modern buckshot than me.
As a general rule buckshot...well, what's a polite, scientific way to say it? Buckshot....well, it SUCKS as a game stopper.
A tiny .22 to roughly .32 caliber roundball moving along at a whopping 1200 f.p.s. is puny. Puny, yeah, puny, that's a really good word, puny. Really LOW energy and even less penetrating ability. Look, 00 buck is about .32 caliber and at about 1200 to 1300 f.p.s. at the MUZZLE ain't no power house.
My personal test with thousand of rounds of buck turned up this:
3" magnum, buffered, copper plated HARD shot, in 00, 15 pellets, in a GOOD modified 12 ga, choke is pretty good out to FORTY yards, In a really good modified 12 bore you can keep all 15 00 buck in a 10" circle on average at FORTY yards MAXIMUM!!!!!!!
So at around 40 yards a hunter would most likely KILL the deer IF he centers the chest and all 15 or most,of the buck land in the kill zone IF the hunter is not shooting through a bunch of brush and saplings.
Buckshot is extremely lethal and works better than most would believe when used as it's designed to be used. AT CLOSE RANGE! I mean UNDER 20 yards in MODERN 3" magnum ammo in the right gun with modified choke AFTER the hunter has done a lot of patterning work first.
Don't believe me? GOOD! Buy 20 rounds of 3" magnum buck, get a deer cardboard target and lots of paper to cover holes from previous shots, pace off SIXTY yards and blaze away and tell me how many of the 15 00 buck landed in the kill zone.
If you have a really good modern gun choke combination you might get all 15 in the kill zone at 40 yards.
But could you resist a shot at old mossy horms at sixty yards, just to wound him?
Now try that 15 pellet buck load out of your black powder gun without copper plated, buffered, pellets and a good choke and you've got a gun that will probably wound everything you shoot at beyound TEN yards.
I've PROVEN that the standard police riot 870 Remington cyl. bore with std. 9 pellet 00 buck can and often does completley miss a man sized target at 25 yards.
A sheriff friend of mine engaged 3 armed robbers in a close range open country gun fight. He dropped #1 face to face with his 870 riot gun 00 buck at 20 FEET, dead as virginity, #2 got smart and ran, and got dropped at 20 Yards, but wounded, and lived, #3 was missed twice completely as he too ran off at 25 plus yards.
#3 stupidly ran into another deputy on the next road, made a threatening move and got .357 magnumed to death.
oppps.
Good story huh?
Anyway buckshot is a bad idea, but by all mean try some AT THE RANGE.