Model 50 glenfield 20gauge what would the barrel be slug or buckshot?

Either. In general, slugs can be fired through any standard shotgun barrel. An exception is for Extra Full Chokes, which are not standard.

Best accuracy with slugs in probably modified choke.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.