If you are limited to just one joule even for airsoft sniper rifles in your location, you might want to watch this video by Fox-Green on what BB to use for maxmium effect... "This video goes through the BBs I use and why I have now changed over to a new BB which I find to be superior. I show just how effective these are especially when you only have 1 joule to use. This will make a huge difference to your game play and massively increase your hit ratio. Plenty of nice shots in this video. Enjoy!"