Not a RN player or an expert, but you should check out how ability works first:
Adalbert's Guide on Ability

You shouldn't be worrying about the ability.

At that point, even 11 accuracy gunners would do fine. Unless you are telling me you are planning to trim them.

I have read and understood the guide for the most part. It explains thoroughly how to calculate ability but it did not answer my question. I am asking other players at which level or how much accuracy ability they had to attain in order to have a good, solid spread in a Lion 1. Perhaps at Lion 2 the level may not be so critical, but I have level 93 Elite gunners with 600 experts and 138 vets - My spread is still far from tight. My accuracy ability for the gunners is 3331. How much more would I need for the spread to be solid/near blocking. I appreciate your link to the guide though. It proved very informative and helpful in many other departments.

27 levels more on your gunners to get the best possible spread.

You have over 3.3 M true ability accuracy on your gunners. Before the raising of the old caps, that was over 2.2x the cap. Now with the new caps it is probably still more than twice the accuracy cap. Getting more in accuracy has long since stopped to improve your spread, only increasing levels improves your spread.
In general expect to improve your L1 spread when your gunners get near L2 lvl, but dont expect near blocks. The great spreads you see on L1's in Gb are all with gunners at or near lvl 120.

Danita, your response is greatly appreciated. Thank you for the information and calculations.