A 1-20 is just fine for a 200gr SST and 100gr usually. Lighter bullets might not shoot as well without a reduced charge. The 185 or 200gr Lehigh might shoot very well in it too.

The problem was during the "super" 45 craze they were promoting 155gr bullets and 3 pellet charges getting in the 2500fps range. Well you might get close to that fps but i doubt it will group well.

The Pursuit Pro with a steel frame in 45cal might be worth $180 but otherwise i wouldn't pay much for it. Maybe $125-$150 in excellent or better shape for a plunger gun. I would verify its stainless too. Most older Traditions were nickel finish.