Just stopped at my local sportsmans to grab some bullets for the .303 British, without consulting a manual for compatibilty of powder I have to bullet weight. Sooo, I grabbed some Speer 125gn spitzer as I wanted to try something different from the 174 and 180's I've done. I use H414 normally, but I cant find any data on this powder to relate with this projectile weight. Would I be seeing myself up for misery if I loaded a few up and tested them using load data from a similar powder such as Win 748? Or, do I need to go back to the store and get a new powder for this bullet weight? Thanks as always for sharing your knowledge!