Federal LE132 1B, low recoil 12 GA cartridges, were discontinued in 2018.
Lead "T" buckshot runs 37 pellets to the ounce or just under 12 grains per pellet.
I recall reading that lead T buckshot was a popular size...
I have long considered bore scrub concerns obsolete when plastic shot cups are used. Indeed this theme was also recently addressed in Shooting...
It appears this recent article by Tom Roster will answer the OP's question quite nicely..
The 870 firearm with Brace.
From a legal aspect, many states prohibit the transport of a loaded rifle or shotgun in a vehicle. Such laws usually don't apply to "handguns"...
No "muscle memory," just mental transition.
Well, Remington and Winchester still load their magnum 12gauge buckshot ammo with a plastic gas seal, fiber wad and buffer. Indeed, in the UK and...
Those are hardly "gimmick components."
In reality, such components with buffer, high antimony pellets and a roll crimped hull are high...
There is a world of difference between junk exotic ammo and high performance shotgun ammo from smaller companies.
Other than a possibly the wrong front sight height, the only thing that comes to mind iis how the gun is bench tested. Shotgun sight in must...
Well it's apparent that your sight picture is not the problem.
I will just add that a 2" high 50 yard zero with the 590 translates to a 75 yard...
I presume you are sighting in with rifled slugs.
Some questions and then some suggestions:
Are you sighting in on a bullseye target?
Mossberg waited until Remington's patent on double slide bars expired.
Mossberg 500 410 bore.
The currently popular "thumbs forward" grip does not work well with powerful revolvers.
Model 1889 Colt New Army Revolver.
The only way to know is to pattern your Gun/Load/OEM choke against your Gun/Load/Aftermarket choke.
Very few shotgunners actually know!
The Trulock basic choke information page should answer most of your questions.
Separate names with a comma.