Re: Shotgun shells jamming
The Ranger was made as an economy model, and my bet is a rough finished chamber, in combination with the lack of quality control on shotshell ammo these days.
The "bulk pack" ammo you find at WalMart and such, is some of the worse excuse for ammo you can find, especially the ones with aluminum bases.
Assuming you are shooting 3" shells in a 3" chambered barrel, and not 3" in a 2.75" chambered barrel, burnishing the chamber will most likely cure the problem. Lengthening the forcing cone reduces extraction problems as well as pattern improvement.
Aim small...Miss small