I can't help much here as I've never shot any composite loads. I can say this, on a recent trip to North Dakota in search of Ducks, I had a Beretta auto-loader that I fed steel shot, and an Elsie SXS that was fed Heavy Shot Classic Double ammo. The Beretta was along for venues where we had to wade/swim to our shooting spots, and sometimes the gun was completely submerged! The Elsie was used for lay-out blind field hunts and hunts from shorelines.
As expensive as the heavy shot ammo was, I do honestly believe that it killed enough duck on the first shot to at least break even with the cost of the steel shot. Absolutely no comparison! Both guns were comparatively choked, given the recommendations for steel shot, and ducks that took two shots at 40 yards with steel were dish-ragged with one Heavy Shot shell. Shots that I would have passed on with steel shot, came to the table with Heavy Shot.
Maybe it was just me.
John
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