Brass cases could require 9 bore wads, me thinks.

Reloading for Shotgunners - Robert S.L. Anderson

1 7/8oz. load
3 1/2" RP Plastic case
RP57* Primer
SP10 wad with 1/4" Fed. 16 bore fiber wad to reduce capacity
running
37.0gr. Herco
1,280fps at 10,500LUP.

RP Plastic 3 1/2"
RP57* primer
34.0gr. Herco
SP10 with 16 ga. 1/4" fiber filler
2ounces shot
12,10fps
10,200LUP

My data is - WW. 3 1/2" hull shortened to 3"
42.0gr. Blue Dot & SP10 wad
85%(1.7ounces) to 95% (2 ounces) both barrels - AYA Matador with ground chokes.

3 1/2" Fed plastic
Fexd209 primer
RP SP 10 wad
2 ounces shot
43.5gr. Blue Dot
1,210fps
10,200LUP
This one went 80% in both barrels

different book

2 1/4ounces
Winchester 3 1/2" plastic
WW209 primer
42.5gr. SR4756
Pacific Versalite
2 1/4ounce shot
1,175fps
10,000LUP - cleanest burning 2 1/4ounce load listed

2 ounces
Winchester 3 1/2" plastic
WW209 primer
48.5gr. SR4756
SP10
1,305fps
9,900-LUP beat patterns in this case

2 ounces
RP 3 1/2" hull
RP 57* primer
34.0gr. Herco
RP SP10 w/20 gauge .135" card
1,210fps @ 10,200LUP

RP 3 1/2" plastic
CCI157 primer
41.5gr. SR7625
SP10 wad
1,235fps 9,600LUP

1 7/8oz.
3 1/2" RP plastic
RP 57* primer
37.0gr. Herco
SP10 w/20 bore .135" card
1,280fps
10,500LUP

2ounces shot
3 1/2" Federal plastic
Fed 209 primer
46.5gr. SR4756
SP10 wad
1,300fps
(,800
LUP - author's favourite cold weather load.(Robert S.L. Anderson - 2nd edition)

You can find further loads in Lyman's Shotshell handbooks.