Here's a previous post of mine about dove shooting with steel factory loads. I'm sure you can locate steel reload data, but it may be difficult to find components. You may end up having to purchase a few boxes of factory steel loads.
Of course, your load and choke selection will depend on the type of dove hunting/shooting you are doing and the normal distance of your shots.
That said, I've shot a good many doves with 20-gauge ¾-ounce of No. 7 steel. The No. 7 steel pellet helps to maintain good pattern density from the 3/4-ounce payload, and they seem to be able to put dove down within reasonable ranges (<40 yards), if you can put the pattern on them!
However, if I had to regularly take 40 yard or longer shots, I would probably switch to a 12-gauge 1-ounce load of No. 6 steel, to provide a little more down-range pellet energy and tighten my chokes to help maintain good pattern density.
Here are some of my pattern numbers to give you an idea of the kind of performance you might get from 20- and 12-gauge No. 7 and No. 6 steel loads.
Pattern results from 20- and 12-gauge Browning Citoris with 28" Invector-plus barrels using Briley flush chokes (patterns average of five, 30" post-shot scribed circle, yardage taped muzzle to target, and in-shell pellet count average of five).
20 GA 2 ¾” WINCHESTER XPERT STEEL LOAD
3/4 oz #7 steel (327 pellets) @ 1325 fps
30 YARDS – SK / pattern 221 (68%)
30 YARDS – IC / pattern 242 (74%)
30 YARDS – M / pattern 272 (83%)
40 YARDS – IM / pattern 197 (60%)
40 YARDS – F / pattern 213 (65%)
20 GA 2 ¾” WINCHESTER XPERT STEEL LOAD
3/4 oz #6 steel (231 pellets) @ 1325 fps
30 YARDS – SK / pattern 173 (75%)
30 YARDS – IC / pattern 181 (78%)
30 YARDS – M / pattern 204 (88%)
40 YARDS – IM / pattern 155 (67%)
40 YARDS – F / pattern 165 (71%)
12 GA 2 ¾” WINCHESTER XPERT STEEL LOAD
1 oz #7 steel (437 pellets) @ 1325 fps
30 YARDS – SK / pattern 319 (73%)
30 YARDS – IC / pattern 363 (83%)
40 YARDS – LM / pattern 278 (64%)
40 YARDS – M / pattern 286 (65%)
40 YARDS – IM / pattern 300 (69%)
40 YARDS – LF / pattern 306 (70%)
12 GA 2 ¾” WINCHESTER XPERT STEEL LOAD
1 oz #6 steel (306 pellets) @ 1325 fps
30 YARDS – SK / pattern 234 (76%)
30 YARDS – IC / pattern 261 (85%)
40 YARDS – LM / pattern 220 (72%)
40 YARDS – M / pattern 222 (73%)
40 YARDS – IM / pattern 227 (74%)
40 YARDS – LF / pattern 229 (75%)
40 YARDS – F / pattern 234 (76%)
50 YARDS – F / pattern 162 (53%)
Here’s a link to study done in Texas comparing lead and steel loads at taking dove.
Good luck!