Dave, this is the best place to start.
http://www.midwayusa.com/product/212783/bpi-buckshot-loading-4-reloading-manual
I have learned that a pay load is a pay load.
Wade gets a lot of his loads right out of the Ballistic's products manual. Over the years, I have learned that Buffer helps a lot on buckshot loads.
If I were starting from scratch shooting plain lead shot from Ballistic's products, I would focus on BB, T, and F buckshot. If I had to pick just one, it would be a toss up between T and F buck.
Dave, where you live, shots can be long, and 50 yards is just a chip shot. For the longer shots, #4 buck will kill way out there.
In my Remington's, I shoot a Carlson's turkey choke, and 100% of the pattern is in a 20" circle at 40 yards, with 00 and 000 all going in a 15" circle. This pattern size is absolutely too tight for some hunting situations, but in the high dessert that you hunt in, it may be great for your longer shots.
Chokes are the strangest thing to work with. I have a beretta 391, have the extra full flush mount, extra full extended, and a super long extra full that is ported. Of these three chokes, the flush mount pattern's the tightest, all Beretta chokes. I can only guess that the additional weight on the end of the barrel is detrimental to the pattern, just like adding a "tuner" or a muzzle break on the end of the rifle barrel can be detrimental/help group size.
I can add that playing with chokes can be very, very beneficial. I buy them used off of ebay, re sale them if they don't pattern the way I wish. Using regular lead shot buckshot, I would start off with a extra full and go down to a .660 choke. It may be just my imagination, but I DO NOT LIKE ported chokes as I believe that it can strip the wad off the shot causing the shot to shoot a wider pattern...gut feeling only.
In Wade's video, he shot a couple of chokes only. What I do is find a good load, then go to testing chokes. I can tell you that F Buck, and #4 buck Kill very good at 50 yards, main thing is to play with patterns/chokes. Four #4 buck will put a coyote on the ground, at least long enough for a second shot.
I hunted with a former Wyoming Game warden and his load was 24 of #4 Buck, he killed the heck out of coyotes with that load, tight patterns at 1300 fps with a standard Rem 870 with a fixed full choke, 30" barrel.
There are a lot of ways to skin a cat