I have seen this data before. What I struggle with is the thought of using #4 shot for coyotes. Yes, I understand that it is comparable to lead bb shot.
1300 fps lead BB shot gets 3.70" of gel penetration at 46.1 yards with about 77 pellets in 1-1/2 oz of shot.
1300 fps TSS 18g/cc #4 shot gets 3.70" of gel penetration at 78.9 yards with about 124 pellets in 1-1/2 oz of shot.
To me there is no comparison between TSS #4 shot and lead BB shot. TSS #4 shot has 61% more pellets in a 1-1/2 oz load and TSS #4 shot gives 71% more penetration range than lead BB shot. All of the tungsten alloy shot types 12g/cc, 15g/cc and TSS 18g/cc break bones way more often than lead BB shot or lead #4 buck dose. Tungsten shot dose not flatten out when it hits bone like lead shot dose.
The ammo manufacturers didn't even know what they were dealing with when they started making shotgun shells with 12g/cc and 15g/cc shot. Remington, Federal and Hevi-Shot were all making waterfowl and Coyote loads with Tungsten shot that was way bigger than it needed to be.
For me the Remington HD 12g/cc BB shot 1-1/2 oz load was more efficient than the Remington HD T shot Predator 1-1/2 oz load and the Federal Heavyweight 15g/cc #2 shot 1-1/2 oz load would have been a better coyote load than the Federal Heavyweight 15g/cc BB load. When you use shot sizes that are too big you go with a lower pellet count and hit the coyote with less pellets.
I bought 400 FHW 15g/cc #2 shot 1-1/4 oz l-1/4 loads when Rogers was closing them out and took the shot out of them and loaded 3" 1-1/2 oz loads. I also bought some Federal Heavyweight 1-1/2 oz BB Predator loads. At 60 yards and less my FHW #2 shot 1-1/2 oz reloads with about 90 pellets per shell worked much better on coyotes than the factory Federal Heavyweight BB , 1-1/2 oz load that only had about 58 pellets per shell.
My worst shooting day ever on coyotes was a foggy day that I couldn't see over 40 yards away and I was shooting Remington Predator T shot loads with 50 pellets per shell. I would have been better off shooting FHW #2 shot with 90 pellets per shell and using a Mod choke instead of a Imp/Mod choke.
2017-01-14 15.04.43-1 by
Robert Morris, on Flickr
I killed 3 of these coyotes and ran out of shells and went back to my truck to get more ammo and then killed the 4th coyote.
For shooting coyotes you don't need a real tight pattern like you do for shooting turkeys in the head.