Question for those who had a big Watermill reception

Hi everyone! I am still choosing my reception location and am anticipating approximately 300 people or so. We've been looking at the Watermill and am wondering how much room the Watermill will actually have. They say it holds 375 but it just doesnt look that big.

For those who had their reception at the Watermill; was there enough room there for 300 people? Or was it very tight? Also, how many people did you have per table?

Thanks so much.