RE: Thompson Contender... G2 or Encore
In that case a 50 cal renagade will do nicely,it is my experance that the smaller calibers get powder residue accumalation faster and a 50 will carry accuratly for a 100 yds which I believe is about 140m if you intend to shoot longer distance than that consider a 54cal. The larger a round ball the better the sectional density so for better range and wind resistance for anyting over 50 m I would consider a bigger cal. Lee