20ga choke tubes??

[Gooserbat]

Sumtoy is the boss of fed hw 7.

[surehuntsalot]

the Carlson extended .575 or the Primos .570 tightwad are the ones you need to look at for a young hunter and a good "hunting" pattern

[wvboy]

my 21" 20ga likes the Trulok choke and heavyweight #7's.  keeps a pretty even pattern at 40yds.

This.. Federal and Trulock for a youth 20 Ga.. can't go wrong..

[ILHUNTER]

Try the Carlson's .575, Good choke and cheap, my son shoots it  with fed hw #7 and has killed birds from 15 to 30 yrds and would easily kill one at 40.

[TrackeySauresRex]

Check the 20 gauge guns / 20 gauge pattern threads below. A LOT of examples of success with the Federal Heavyweight #7's. Lots of choke / shell combos to read through....

This^^^^^^^^^
I have good luck with the SSX and federal Heviweight 3-1.5-7's out of my 20 ga. Mossberg, but as Steelerfan has stated, there is a wealth of info on the 20 ga thread.

Look for your gun in the threads on the pattern page. You'll find some good info to get you close.

[daddyduke]

I've had good results with H.S. Strut Undertaker non-ported.

[pogo]

Before you buy a new choke try federal 20 gauge shells with the "flightcontrol" wads!  The best are of course the heavyweight #7s which are simply amazing, but even the #6 lead with that wad will be an improvement over what you are currently shooting.  The only other shell besides federal I would consider are hevishot 7s, due to high pellet count, and also being tungsten based they pattern a bit tighter than lead.  But overall federal has the 20 gauge flightcontrol wad figured out and it make a difference even without the high-end chokes.  But those chokes can put up numbers that make it a legit 40 and beyond load that rivals 12 gauges without lots of recoil.