Like I said in my other post. The 20 ga slug guns are very comparable to a magnum inline muzzle loader. The biggest difference being they don't use black powder and you don't have to load them from the front.

They have very similar bullets, bullet weights, velocities and barrel twist rates. So if you think a modern inline magnum muzzle loader is enough to take a deer with, then there is no question that a 20 ga with modern sabots is plenty. Performance wise they are in par with a 45-70 using modern factory loadings. As a matter of fact winchester has shells for both the 45-70 and 20 ga that are very similar in design, weight and velocities.

It is really hard to say that a 20 ga will be more accurate than a 12 ga. That really depends on the gun and if you find a load it really likes. However I feel the 20's have the potential to be more forgiving of different loads and it would probably easier to find one that worked well, especially in the faster offerings. Most of the 12 ga guns don't care for the faster loads. Some do, but most I have talked to have better luck with speeds around or under 1700 fps with bullet weights from 400-450 grns.

Paul