As Swamp Rat pointed out, it may not be a legal hunting load where you live. In any case, at usual deer hunting ranges, it isn't all that effective anyway.
Many years ago, some friends of mine worked up buck and ball loads according to the old military specs and found that they were of use when lines of soldiers faced off in battle in Rev war style at close range. When used this way, the buck scattered and hit all up and down the line. I don't recall the range for this test, but I think it was probably around 25 yards.
When aimed at a specific target, the term accuracy became meaningless. Buckshot by itself patterned O.K. and patched ball loads hit with decent predictability. Mix the buckshot and ball together and the "group" became somewhat more random--say about the size of Oklahoma-and perhaps larger if the wind was blowing. The guns used were Besses and the shooters knew their business. The range for target work was 40 yards I believe but this was a long time ago.