One of the enemies of bottled beer is oxygen. It wont necessarily cause an infection, but even slight oxygenation can impart some off-flavors in a beer.
BJCP Description:
Oxidized - Any one or combination of winy/vinous, cardboard, papery, or sherry-like aromas and flavors.
This is especially true if the beer is a light-medium style like a Blonde, Kolsch
etc. For short term storage (party, tail gate, gift giving), this isnt generally a problem. However, if you are going to store these beers for any length of time (3-4 weeks or more), its worth making every effort to push out as much O2 as possible.
One of the easiest ways to purge oxygen from your bottles using the BMBF is to cap-on-foam. That is, get the bottle to slightly gush and cap right on top of the foam. The foam after all is very near 100% CO2. Getting your bottles to foam consistently is a bit tricky so I thought Id share my technique. (This technique is also used by our local micro brewery that fills their 22-Oz bombers by hand.)
Heres my process for getting the bottle to foam, without loosing too much CO2 or beer.
1) Fill your bottles normally. Follow Bobbys technique for removing the cane and squeezing in a bit more to get a slightly higher fill. (Dont go too high if youre planning on entering this into a competition
youll get dinging a bit.)
2) Once you have your bottles moved over to the capping table, place a cap on the bottle, hold it on firmly with your index finger and tip the bottle upside down and back (rather gently)
once.
3) Set the bottle down and wait a moment and have your capper ready. Youll see the cap burp once or twice as the O2 is pushed out.
4) Once you see the cap actually start to rise on top of the foam
cap it. There will be minimal foam spillage depending on the CO2 levels.
5) Youve now capped a bottle that should be devoid of all oxygen, and captured most of the CO2 that was in the foam (this will be reabsorbed into solution.)
As an added safety measure, Id recommend using O2 absorbing bottle caps. Between the CO2 purge that occurred using the above method, and employing O2 absorbing caps, the shelf life of your beer will be indefinite.
Hope this helps. (I had to learn the hard way about oxidized beer)