Not enough pellets, bad patterns. I'd stick with #2's and smaller for 20 gauge. What do you want to use it for and at what range? I'm assuming you're talking about steel pellets, but maybe you're talking about lead?
Because of how large BB BBB and T are, they won't stack into a 20 ga. hull as densely as smaller steel shot will. The largest size shot that the case will hold 1 oz of shot in is #2 steel. Regardless of patterning, you will be down to somewhere around 7/8 or even 3/4 oz of shot with the Ts, probably. That is a pretty scant number of pellets to work with. 3.5" 12 ga. loads were needed just for that reason.
If you want to shoot as far as the big guns at geese with the 20 ga., I think you are going to need to consider the other non-toxics, like #4 Rem HD or #4 hevi-shot.
You need to go hevi-shot, tungsten, or nice shot if you want to hunt geese with a 20.. cant fit enough steel in there to do any damage past 30 yards. A 1 1/8 or 1 1/4 load of #2-4 tungsten will knock a goose on its rump, I used to shoot kent matrix 1 1/8 #3 out of a 20 at geese.
I shot at decoying geese, first shot 20-30 yards. Used a factory mod choke.
The lead depends on what load you are shooting, wind, way the birds are flying, etc.. its just something you have to learn. Practice practice practice, more time in the field (or water) the better hunter you will become.
I bought the kent impact tungsten matrix from gander mtn I believe, it was around $30 for 10 shells.
Its not something you want if you are going to pass shoot and just throw shot at them, and you probably wont want a 20 gauge for that anyways. For decoying geese you dont need much, a 20 gauge will do the job.
And before anyone says anything, I was shooting 13-15lb giants.. the #3's did the job just fine. Tungsten has much more knockdown power than steel, a #3 tungsten is like shooting a #1 steel.
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