I'm convinced - with my gun setup - I could shoot plain old Winchester skeet shot & kill turkeys with it!
But, I digress...
If it were me, I'd check out Hevi-Shot; they have a money-back mail-in rebate that makes their Magnum Blend shells $4/shell, once you get the rebate back. That's a fair price imo, and based on what I've seen on YouTube & patterns by guys locally, I'd say it'd do the job fairly well...
When my custom shells run out, I'm going to shoot some 3" magnum Remington shells my brother gave me over Christmas; my uncle hunted with them back in the 70's & had a bunch of boxes leftover... I patterned one & it up-ended the deg'gum piece of plywood I had taped my paper target on... It also up-ended my deg'gum shoulder, too!! Hahaha...