Which of these in their most common gun (lever gun for 45-70, 10" barreled revolver for 500 S&W Mag, 12ga Brenneke Rifled slug in smoothbore pump, 12ga sabot slug (take your pick) in rifled barrel pump) would be better as a self defense gun against grizzleys? Such as backup for a hunter, or just for personal protection when hiking or hunting other critters?
And with shotguns - would 2.75" vs 3" vs 3.5" make much of a difference, or is the extra shot with 2.75" more important? Is my 8 shot 2.75"/3" Moss 590 enough, or would a Remington 870 ESM that can take 3.5" be a much better idea?