What is the best way to chum for large sized pinfish instead of just small ones?

Answer 1

If you are talking about saltwater "pinfish", you will need some "fish meal",(fish meal=dried powder which is made from ground-up fish & oat meal).

If you can't find "fish meal", go to a pet store and mix fish food, "salmon flavored" dry catfood, with mud.
Make balls out of this mud/catfood/fish food mixture.
Buy a six pack of soda,(or beer), drink content, then cut the top out of the can. Stuff mudball into can, and secure the can in the mud/sand at low tide. (Be careful you don't get "quicksanded" by the lovely FLA mud!)

When High-tide arrives use a "cast-net" to cast "over" the area's you have baited with the cans of mud/bait. You will catch Pins, Mullet, Shrimp, ETC. This is also an excellent way to catch fresh edible shrimp.

Answer 2

maybe try wetting oatmeal, make loose doughballs of it out so they break up underwater