I have tried duplicating the superformance load by pulling the bullet and matching the powder charge. If you look at the powders with a magnifying glass or even your naked eye you can see the two powders are not an exact match, although they do look very similar. The pressure developed by the Superformance powder is much greater than the factory ammo blend and could damage your rifle or cause harm to you. My rifle and I survived, but the brass was destroyed. The primer pocket was so enlarged a new primer could be set inside without touching the sides of the case. I recommend starting low and working your way up with superformance. It's a great powder and I have had good results in several different rifles, but trying to duplicate a load in that way was not a very bright move on my part. Also keep in mind even though it is factory ammo, it is a max load and many of the factory brass are unusable after being fired. Primer pockets will be enlarged, and there are almost always ejector marks on the head of the brass. Good luck with whatever you decide!
