OK, so my brother in law gave me a few cool growlers he had laying around to use. Since I cannot carb up a beer in them I am curious how to get the beer into them with little foam and as much beer as possible. I don't own a beer gun, although I think one was included with all the stuff I was able to get for free. Have no clue how to use it. I have a Perlick tap that I believe is front sealing. Any input is welcomed. Thanks.