The best scoop or coffee can of them all is a big plastic kitchen measuring cup from WalMart. They have handles on them and the measurements are marked so you're always sure precisely how much is being fed.
I know there are 8 oz & 16 oz cups; are there 32 oz cups? I haven't baked in so many years, I don't know. I don't own a horse that eats more than 10 ounces of any of their supplements at one feeding.
I am pretty sure all measuring "things" for baking are dry measures, as opposed to wet measures
I carefully measure/weigh everyone's feed because it's too expensive to give them more than than they need and, with two of them having metabolic issues, I split hairs on the measuring lines in the cups