So the bolt size is #8-32.  Due to Skipmaster1's genius it gave me some inspiration for a head idea too.  I will post up a little later.

Hey thanks for the idea...i made some this afternoon...the bolt is 8-32 and if you use a 2 inch bolt with the t-nut (the wicked looking part) and one 8-32 nut behind it you end up right at 125 grains as well...and the nut threads on tight...dont have to worry about it spinning that way...!

thanks again for the great idea...cant wait to test em out! :-)

brandon

So here is what I came up with.  All credit goes to skipmaster1 since this is his original idea.  What I love about his idea is you can get your grain to just about wherever you need it.  I shoot 150 grains normally so I have a new head at $1.50 a piece right at 146.  Awesome can't wait to try these out.