I don't recommend it. Overtime calcium buildup in your rooster doing considerable damage to its internal organs also contributes to gout and can result in deformities to the bones. It is also associated with very minor reductions in feed efficiency, the kind of thing you will never notice with a flock of just four birds.
That said, calcium toxicity is a progressive disease. How fast it affects your bird depends on its size it's breed, it's age oh, the amount of excess calcium consumed daily, and the duration of the excess calcium intake. If you don't plan on keeping your bird long, say it's intended for the table, then chances are very very good you will eat the rooster long before the signs of calcium toxicity are evident.
How quickly and how severely you are bird is affected does not reduce to an easy formula. Too many variables, too poorly understood. It's like smoking, no one can tell you that a particular cigarette will give you a particular cancer. But they can say with confidence that if you smoke enough long enough, often enough, you will almost certainly get some kind of cancer.
Best I can offer you is anecdotes from my own flock.. My roosters get about twice as much calcium as desired due to the feed I have mixed up, which is a pretty basic 16% protein layer type mix combined with a 24% protein game bird type mix with much lower calcium, end result about 2.8% calcium on average. When I cull a young rooster, there is no evidence of calcium buildup externally and none I can find internally. When I call a rooster at about 1 year of age, sometimes I can find very minor internal evidence. I have yet to call a rooster closer to 2 years of age and take photos for comparison.
I definitely would not feed bullets a layer feed type formulation however. Very young birds are very sensitive to excess calcium levels.