grnhd wrote:I'm curious, what can that powder do that steel cant do better? From the data I've seen, steel produces less pressure and more speed for the same shot weight.
With most steel shot loads STEEL powder works better but that's what it was designed for.
SR 4756 works very well with heavy lead loads especially in the 10 ga., STEEL is considered a High Energy powder which basically means it has more Nitroglycerin content in it, which has a great burn curve for steel shot loads but with heavier lead loads it peaks out pressure wise way to fast, even though it's slower burning technically you get no real benefit from it velocity wise, if that makes any sense. As was stated SR 4756 is a lot more predictable in what it will do in many loads , high nitroglycerin content powders are not in many applications.
To a lesser extent you can also see this with Longshot loads, if you look at heavy lead loads there is really not much difference in velocities between 4756 and Longshot in many heavy lead applications, maybe 50 fps in some loads. Not that Longshot is not good for lead loads, it just peaks out pressure wise much faster than other powders and has to be used carefully because pressures peak so much faster with it.