Legal here
Buckshot is still legal here on deer, as is dog hunting deer as well (not all counties allow dogging deer). Both are seen less and less in my county, even though still legal.
In its heyday, dogs helped recover cripples, and there were often enough hunters involved that a hit deer would get shot at again by another stander as well. Deer were on the run, hits with only a few pellets were common.
Range is the factor. Fifty yards is to long, and many were/are shot at past fifty. I'd have to say that the gun is not the factor. Getting a killing pattern w/ any rig is a percentage game past fifty yards. What matters is the ability/character of the hunter to pass a shot that is out of range.
The onset of deer leases, shooting houses, and the prosperity to afford club dues and rifles in general have pretty much nixed buckshot/hounds and deer near me.