http://www.armbrust.acf2.org/nontoxicupdate1and2.htm

Yes, Armbrust recognizes by volume 1 oz bismuth fits a 1 1/8 wad cup, he does not state that you should use 1 1/8 lead data in lieu of tested bismuth data. He recommends going to the Hodgdon website for data.

He does provide some load options in 12ga.

Reference buffered loads. Yes, they tend to significantly higher pressures, but if you follow tested recipes you can make some good performing loads. Buffered loads

Michael Dittamo
Topeka, KS