lostknife4 wrote:I think DDC or BTJustice advised us about the change in ASteel and I think it occurred somewhere around the Lot 14, I stand to be corrected on this. So it really depends not only on the Data but the date the data was presented, unfortunately that information is not posted with the data listings so no way to know what Lot the data was developed with.
You won't get an answer from Alliant about this and if you do more than likely it will be the powder is in spec.
What they don't tell you is there are no specific specs for powder formulation as it's all proprietary.
Here's my take on the whole thing..it may be wrong but it's going off information I received.
The older lots of canister grade STEEL were a bit slower than the newer lots, I believe they never really changed the formulation for STEEL just the amount of burn retardant used on it.
STEEL relies heavily on burn retardant to get a controlled (read that controllable) burn rate, remember I keep preaching about this being a High Energy powder. When they have as much Nitroglycerin content in a powder as many of these high energy powders have it gets harder and harder to get a controlled burn out of it, basically it becomes more like an explosive and less like a reloading powder or propellant if you will. So they have the additional task of using just enough but not to much burn retardant on STEEL to keep it in their specs, which makes a lot of these high energy powders different than standard reloading powders we are used to.
They use to much burn retardant and you have a hard to ignite powder that doesn't work well with very light loads (could be the reason for the disappearance of many of the AllIant 7/8 oz loads a few years ago), to little burn retardant and then you have a right now powder that goes overpressure very fast with minor changes to a recipe..al la Longshot.
Basically a balancing act they have to maintain, older lots of STEEL were slower but they usually were within 10% of the burn rate of newer Lots of STEEL, except for the Lot 2 stuff the jury is still out on that one.
That's why no one has ever officially acknowledged any Lots of STEEL are different from any others, they make it and then hopefully it comes in at some kind of spec they set or not. I believe the reason newer lots are a bit hotter than the older ones is to try and compensate for poor ignition qualities, how much they have is the question.