Need help w/7.65 cast bullets

[shooter1970]

I want to get some use from my 1891 7.65 arg. I was going to use the lee .312 185gr bullet but I can not find gas checks for this all I see are 30 cal then 8mm nothing in the middle,can someone wise help? as you can tell I am new to this.thanks

[mooman76]

It uses 30 cal gas checks for that mould. It is concidered a 30 cal. mould.