Three-quarters ounce loads are for .410s and 28s.
Don't get your hackles up, I'm fine with anyone who wants to use 3/4 oz. loads in a 12. It's just not for me. I like 3/4 oz. loads in the smaller bores. For some reason, years ago, I became gauge specific with my payloads.
I like:
10 ga. (3 1/2") - 1 3/4 oz.- 2 oz.
10 ga. (2 7/8") - 1 1/4 oz. thru 1 5/8 oz.
12 ga. 1 oz. thru 1 1/4 oz.
16 ga. 1 oz.
20 ga. 7/8 oz. thru 1 oz.
28 ga. 3/4 oz.
.410 1/2 oz. thru 3/4 oz.
I know ............I've got too many guns.