Warning: The following is an opinion.
I am of the firm belief that a double barrel 20 g. is the perfect survival gun.
Here is a list of reasons:
#1 A 20 g. slug will take any game in North America.
#2 Various shot size will take any bird or small game.
#3 A double barrel shotgun is a formidable defensive weapon.
I personally like a double with 2 triggers so that I can choose the barrel I want to shoot. I can then load shot in one barrel and slug in the other. This way when I am out hunting I have the option of taking any game that presents itself.
For me and the areas I hunt there is a lot of brush. Shots past 80 yards are actually rare where I hunt. Most everything I have taken has been well short of that.
So why 20 g. instead of 12 g.? Well I actually have a 12 g. and I love the gun, but the slugs and the shot move at the same velocity in both shells. The only thing that changes is the amount of lead. For slugs the 12 g. is .73 caliber. and the 20 g. is .62 caliber. The 20 g. is more than enough to knock down anything in N.A., but I do like the fact that the 20 g. takes up less room and weighs less for the same amount ammo.
The following pictures are of Dolly. She started out as a Remington 1889 12g. When I bought her she had bad dents in the last four inches of the barrels that some one tried to take out with heat (bad, bad, bad) so I got her cheap and that allowed me money enough to have a few things done to her. I had the barrels cut back to 24" and then had a set of express flip up rifle sights installed.
She now prints 3/4" composite groups (2 shots) with Fiocchi slugs at 60 yards. This opens up to 3-4 inches at 100 yards. This is not typical and I realize that I got lucky, but it worked better than I could ever of hoped for.
With the success that I had and with my opinion of the 12g. vrs. 20g. I bought another double in 20g. The idea with the flip up sights is that I can notch the second and third blades to match the barrels point of aims independently. Figuring that I will be caring shot in the left barrel and slugs in the right, I expect that I will only have to set the blades for the right barrel (slugs) and then just learn the lead for the left barrel (shot). The second and third blades will then be for distance.
This is Dolly:
http://i425.photobucket.com/albums/p...100_0034-1.jpg
http://i425.photobucket.com/albums/p...100_0037-1.jpg
http://i425.photobucket.com/albums/p...100_0031-1.jpg

