40/90bn

[Kurt]

Mike.

The powder granulation does make a difference in the BN cases, as well as compression. I found that the larger granulation compressed just enough so it does not crush works the best for the ES that reduces the vertical in my BN .44's, something that is not as critical in my straight walled .44. 1.5 OE and 1F KIK with light compression .100 to 150" is where my best results are. I really think it has a lot to do with the uncrushed course granulation of the 1F powder that gives a faster burn and hard lumps form heavy compression blocking the bottle neck holding pressure back sort of like holding your thumb over the end of a hose and making a hotter burn that increases the velocity, increasing the vertical. The straight walled case does not block like the BN case will.
I worked with 1F to 3F in the big .44 bn the 1.5 and 1F light compression always showed the best accuracy. You will give up a little velocity but the accuracy is what counts.