Aren't all regular steel shot shells 'magnum'. On big water, give me a bit more shot and a little higher velocity. Yup, 3/4 oz in a twenty might have done the job, just a few days ago three had enough left to out swim a good lab and a few others needed to be anchored on the water. Maybe I could learn to shoot better, but then again hope I can still get out there in the mean time.