Looking at the replies since I originally posted, you will find many suggestions less than 240. If you are in the thick stuff and the range is essentially zero, a 22 LR might work. Not to put the other posters down, but my shots are not usually that close. I plan on at least 100 yds. I also want a hole in one side and out the other. My experience is that you need a heavier bullet. Just my opinion. Good luck.

It's more important where you hit 'em, than what you hit 'em with.