High-brass No. 9s...are a lot of fun.
If you can find 'em...or you reload 'em.
I think Winchester manufactures an off-the-shelf "hot" load with 9 shot...but most likely you would have to order it, or as mentioned, load 'em yourself. (Also a great load for quail...especially later in season (been hunted before) when they are apt to flush well ahead of the dog.)
But like most folks, most of the time I typically buy whatever is sold in bulk at a discount, doesn't take a lot to knock down an opening-day dove. You just gotta hit it, somewhere other than the tail. lol
good luck...post some photos of you hunt.