I've seen references to a filler known as grex/psb. I've checked previous threads to find out what it is with no success. I tried googling the term, but all I came up with was after market auto parts. Then I found a thread in this forum that said that grex was mainly used as a shot buffer. Well OK, off to Midway. No grex at Midway, but they do carry three products from BPI Industries called Mix47, Original and Bismuth shot shell buffers. BPI claims that the Original is compatible with centerfire applications.
So, my question is: has anyone used BPI Original in centerfire rifle applications with good results? Here in NH with our summertime humidity, such that oyster crackers have a shelf life of about two weeks once opened, I won't use cereal fillers. The descriptions I've read of dacron use have put me off the use of that material, at least for the time being.
Bottom line, I'm not asking for a specific load for a specific rifle. I DO understand that fillers raise internal pressure. And if I come close to a max load (one grain at a time) during winter, that I will have to start at the beginning again come summer. With the full understanding that I have the sole responsibility of producing safe handloaded ammo for my guns, can anyone recommend any of these three produts from BPI. Thank you.
Ken