depends on the field really ive played with a gun shooting 410 its up to the field owner/host to set the limit
just my 2 cents

Field limits are just that, limits not goals.

Higher fps means your bbs will travel faster, it doesn't mean it will travel farther or more accurately. In fact it will have worse accuracy.

btw your spring looks compressed...wich is bad. When you know you are going to store it, put it on semi and fire some shots so you are sure it cycles completely and the spring won't stay compressed. When you fire full auto the gun does not cycle completely so it is possible that the spring will remain compressed, wich will result in weaking it and you will have a huge FPS drop.