I used to hunt a bunch of military bases in VA that were buckshot only. It is very effective if you keep the ranges less than 40 yards. think of it as archery distances with a gun. Shoot several brands and see which one groups the tightest in your gun which it seems you have already done. I'd think about going full choke though since you need to smack them with multiple pellets.

This 7 point fell to Win 00 buck.

If you look close you can see where the pellets hit.