Here are a few of my pattern numbers from 20- and 12-gauge lead loads, that I’ve shot pheasants with, to give you an idea of the kind of performance you might get from similar loads and chokes.
Patterns from 20- and 12-gauge Browning Citoris with 28" Invector-plus barrels and Briley flush chokes (patterns average of five, 30" post-shot inscribed circle, yardage taped muzzle to target, and in-shell pellet count average of five).
20 GA 2 ¾” RELOAD (BLUE DOT)
1 oz #6 lead (233 pellets) @ 1200 fps
30 YARDS – SK / pattern 147 (63%)
30 YARDS – IC / pattern 168 (72%)
40 YARDS – M / pattern 146 (63%)
40 YARDS – IM / pattern 163 (70%)
20 GA 3" RELOAD (BLUE DOT)
1 1/8 oz #5 lead (190 pellets) @ 1200 fps
30 YARDS – SK / pattern 140 (74%)
30 YARDS – IC / pattern 150 (80%)
40 YARDS – M / pattern 138 (73%)
40 YARDS – IM / pattern 147 (77%)
12 GA 2 ¾” RELOAD (GREEN DOT)
1 1/8 oz #6 lead (267 pellets) @ 1225 fps
30 YARDS – SK / pattern 171 (69%)
30 YARDS – IC / pattern 211 (79%)
40 YARDS – LM / pattern 173 (65%)
40 YARDS – M / pattern 182 (68%)
40 YARDS – IM / pattern 195 (73%)
12 GA 2 ¾” RELOAD (UNIQUE)
1 1/4 oz #5 lead (210 pellets) @ 1225 fps
30 YARDS – SK / pattern 145 (69%)
30 YARDS – IC / pattern 177 (84%)
40 YARDS – LM / pattern 155 (74%)
40 YARDS – M / pattern 155 (74%)
40 YARDS – IM / pattern 174 (83%)
Hope this helps, good luck!