Not sure what field or league but he play's first and is a big power hitter...he's like 6'4 and 270lb....nickname is Chicken
two of our fields are 290 with 20 ft fences and we use league supplied bats with only 3 hrs per team and the balls still fly out.
one field is 300 with 20 foot fence and my happiest moment was putting it over that in dead center.
Our fields go from 280 in left to 310 in RC, 300 in R. The fences are about 40ft high with an HR stripe about 25 ft up, (golf range nets on top of 10 ft fence) and balls go over them, so I see them land in the 350+ range. The RC and RF don't have the nets, only 10 ft fences.
I'm lefty and bat either 1-2 so my job is to get on base and run. Two years ago I hit about 5-6 out, but last year I didn't hit any. Same 3 hr limit.