Your issue is finding data for canuck and imperial hulls which wasn't even easy to get back in the day let alone now . Not the powder type since most are still around . Adding that they are 16ga is even tougher
Cheers
16ga com posted this some time ago for paper hulls but I have no idea if safe or on using it and remember when they say any hull that is not imperial or canadian made ones but there may be something in those old manuals they list
From the Alcan Manual No. 11. (Sometime in the '60's.)
Low Base wad (not necessarily low brass) hulls, i.e. Federal, J.C. Higgins, Red Head, Revelation, Super-X, Super Speed, and R-P: 18.0 grs. of Red Dot/no primer specified/2 X 0.135" over powder (OP) card wads + 1/2" or so fiber filler wads/1 oz. shot. Allow about 1/2" above the shot for crimp space. So the wad column may need to be adjusted with more/less filler wads.
For High Base wad hulls, W-W Expert & Ranger: Same load, may have to adjust the fiber fillers.
From the Lyman No. 40 Manual (but attributed by them to Alcan)
3 1/4 - 1 1/8 load: any paper hull/ W-W 209 primer (except for R-P hulls)/28 grs. Herco/ 2 X 0.135" OP+ 2X 3/8" fillers/ 1 1/8 oz. shot
For a 7/8 oz. load they specified 20 grs. Red Dot the 2 X 0.135" OP wads and enough fillers for the 1/2" crimp space.
From the Speer Reloading Handbook #5
2 1/2 - 1 oz load: 18.0 grs. Red Dot/no primer specified/ a wad column of 11/16" height w/High base wad hulls or 7/8" wad column with LB wad hulls/ 1 oz. shot.
3 1/4 - 1 1/8 oz load: 28 grs. Herco/ a wad column 9/16" high w/high basewad hulls or 3/4" with LB hulls.
From Hercules Ca. 1970
2 1/2 - 1 load: Federal paper case/Fed 209/14.5 grs Red Dot/R-P W29932 (R16L)/1 oz. @ 1165 fps.
2 3/4 - 1 1/8 load: Fed. paper case/Fed 209/18.0 grs. Unique/W29934 (SP 16)/ 1 1/8 oz. @ 1185.
3 - 1 1/8: W29934/ 22.0 grs. Herco @ 1240 fps. Use an SP16 w/a 20 or 28 ga. OP in the cup for the R16L.