If he spent 4–5 hours on an off day just nonstop snapping the football, he’d probably get pretty good at it. I’m not trying to be mean, but is snapping really that difficult if you spend a couple hours learning? Or is he having trouble adjusting to blocking post-snap?
Snapping when the QB is under center is mechanically simple (snap, rotate 90 degrees). If you don’t have large hands it can be challenging to grip the ball and get it exactly into the right position for the qb consistently . Even in the nfl where centers have snapped the ball countless times, you still see fumbles at the snap. Especially happens when a new Qb is under center. It’s not just practicing hours on end. The center needs to practice with the Qb who will be getting the snaps because it needs to be exactly where the Qb expects it to be. It’s not going to help that much if a different qb spends hours taking the snaps.
Snapping out of the pistol or shotgun can be a lot more difficult . This one you could practice with any qb as the ball goes to the exact same place. If the center has small hands it’s difficult to get a perfect spiral back. Not impossible but takes practice.
The really difficult part is that the center has to do all this while also getting into a pass blocking or run blocking stance almost instantly. If he’s a millisecond slow he is going to get knocked backwards. So centers will sometimes try to start moving forward as they are snapping the ball and that’s when a lot of mistakes happen.
for a lot of OL who take reps at center, it’s not that challenging to do correctly during practice. When it goes live they start overthinking. the inexperienced center starts worrying about where he is trying to place the ball, how he is going to get out of his stance, who is blitzing, the snap count, etc.
Of course all of this is also assuming perfect weather and conditions. Try doing it when it’s 10 degrees and you can’t feel your fingers (I have never seen a center snapping with gloves on). Or when it’s a torrential downpour.
You can “make” a center out of a guard or tackle like you could make a 3 point shooter out of Shaquille O Neal. With enough practice he could probably develop into a slightly below average 3 pt shooter. Question is, how much time do you want him to spend doing that when he is excellent in the paint ? Would you rather him refine what he already does well and with more practice can go from very good to elite, or spend time practicing going from awful to slightly below average?
If the OL coach doesn’t have a choice because of limited options , then he will probably consider the latter. If he has choices, he will probably just have the guard or tackle focus on becoming better at those positions.