I used to reload my shotshells , now I just do my metallic cartridges, I ran accross some good deals a couple years ago at I think payless, so I stocked up.
Remington makes the express long range
2 3/4 inch with 3 1/4 dr 1 1/8 oz of 7 1/2shot . I like this one when im up in the hills hunting for Blues.
When im in the river bottoms hunting for ruffed grouse I use the winchester rabbit and squirrell . it has 2 1/2 dr with 1 oz of 6 shot . They work really well for me and Im sure they still make them . Try green supply or walter craig companys . Federal Hi Power is a really good one too I only have a few of those left and the box was lost a long time ago they are 6 shot also they are probably my favorite overall.
Try your 16 for grouse just knowing the uniqueness of the gun and gauge makes it fun. and the performance is even better.
See ya