I've shot a good amount (10s of thousands of rounds) of steel through my 12ga and 20ga Citori's with no issues.
Here are a few of my pattern numbers to give you an idea on how they perform.
Patterning results from a 12-gauge Browning Citori 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).
30 YARDS / CYL
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 225 (54%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 231 (53%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 169 (54%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 184 (60%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 132 (61%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 88 (54%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 89 (64%)
Average pattern percentage of all loads / 57%
30 YARDS / SK
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 285 (68%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 319 (73%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 236 (75%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 234 (76%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 176 (81%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 118 (73%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 116 (83%)
Average pattern percentage of all loads / 73%
30 YARDS / IC
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 315 (75%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 363 (83%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 252 (80%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 261 (85%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 202 (93%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 132 (81%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 129 (93%)
Average pattern percentage of all loads / 84%
40 YARDS / IC
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 111 (80%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 100 (66%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 61 (72%)
Average pattern percentage of all loads / 73%
40 YARDS / LM
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 262 (63%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 278 (64%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 199 (63%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 220 (72%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 150 (69%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 106 (65%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 114 (82%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 107 (70%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 69 (81%)
Average pattern percentage of all loads / 70%
40 YARDS / M
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 275 (66%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 286 (65%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 210 (67%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 222 (73%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 159 (73%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 106 (65%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 114 (82%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 120 (79%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 70 (82%)
Average pattern percentage of all loads / 72%
40 YARDS / IM
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 247 (59%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 300 (69%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 211 (67%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 227 (74%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 165 (76%)
Win Xpert 2 ¾” 1 1/8 oz #3 steel (162 pellets) / pattern 121 (75%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 114 (82%)
Average pattern percentage of all loads / 72%
40 YARDS / LF
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 249 (60%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 306 (70%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 218 (69%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 229 (75%)
Average pattern percentage of all loads / 69%
40 YARDS / F
Rem Sportsman 2 ¾” 1 oz #7 steel (418 pellets) / pattern 266 (64%)
Win Xpert 2 ¾” 1 oz #7 steel (437 pellets) / pattern 299 (68%)
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 218 (69%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 234 (76%)
Average pattern percentage of all loads / 69%
50 YARDS / IM
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 121 (56%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 100 (72%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 86 (57%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 61 (72%)
Average pattern percentage of all loads / 64%
50 YARDS / LF
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 139 (64%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 100 (72%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 95 (63%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 60 (71%)
Average pattern percentage of all loads / 68%
50 YARDS / F
Rem Sportsman 2 ¾” 1 oz #6 steel (314 pellets) / pattern 159 (51%)
Win Xpert 2 ¾” 1 oz #6 steel (306 pellets) / pattern 162 (53%)
Rem Sportsman 2 ¾” 1 1/8 oz #4 steel (218 pellets) / pattern 148 (68%)
Rem Sportsman 2 ¾” 1 1/8 oz #2 steel (139 pellets) / pattern 106 (76%)
Rem Sportsman 3” 1 1/4 oz #2 steel (152 pellets) / pattern 95 (63%)
Rem Sportsman 3” 1 1/4 oz BB steel (85 pellets) / pattern 63 (74%)
Average pattern percentage of all loads / 64%