Free: Contests & Raffles.
Early season before the rut if you must shoot the big bull. He might lose 40% of his body weight chasing and defending cows, Where he is white (fat covered) in August be is blue (no fat) in November. If your goal is table use this is my order of preference: calf, dry cow, cow, spike, mature bull. This is not a perfect system, always taste test before you process. I have had stringy little calves and good old bulls.