been there done that, had the h/r 10ga single shot, had the double 10, Ithaca an updated Rem 10 they bought out the Ithaca - so one day before turkey season, we took all 3 10s, an 870 3.5 in mag, a Mossberg 3.5 12 pump and a beretta 12 3.5 and my trusty 870 3inch that I got as a kid.
Yes you are right at 35 - 45 - 55 I had more pellets in the head of a turkey target with the 3" rem 870 barrel with choke than any of the combinations we tried -
The beretta was next best then the 870 3.5 the moss12 and 10s were all fairly close for the rest
we shot 5 and 6 sized shot because 4 is the largest here and 10 ga the largest allowed here legally -
I have taken geese as far as my hunting buddies with their 10s however with more shot flying im sure the 10s might have a better chance of bringing down a coyote or more birds on a flock shoot -
I don't like the punishment of a 10 for hunting but they have their value - the shell costs continue to climb so that is also a deterrent - we use 00 buck for coyote and intruders around here ;-)
00 buck is no longer being used by law enforcement here - they now have to use bean bags, plastic rounds or slugs - 00 buck is too dangerous as it might take out an innocent bystander