Ithaca Mag !0.......now that is a thumper.
Mossberg Shockwave.....Not particularly fun to shoot. Any application (hunting, Trap, SCs, HD) is a compromise. They are Kool, no doubt.
The 18" barrel idea is a better, more versatile, option all around.
Personally, I took an old M500, picked up an after market fore end and grip, threw on an 18" barrel that I had and there I had a Shockwave + 4". Works for me. Rarely shoot the thing. Other shotguns do their jobs better. But...It is Kool.