I have used IMR4227 on several loads and have found that I have granuals of unburnt powder laying atop my shooting bench. I load with about six different powders and have noticed this before using this powder, eliminating a one time only occurence. I know that this powder is generally used with the heavier bullets and is a slow powder, I noticed this w/a 240gn bullet. The load that I shot Thursday was a 44 mag. w/a 240 XTP atop 23 grains of IMR 4227 and a CCI300 primer, I shot the load out of my 629-1 and my shooting partners 9 1/2" Redhawk. Does anyone w/ a chrony have any velocity readings using this powder out of the eithier gun?