I often see people say XYZ powder from 1940x, 1950x, etc is different than current XYZ. I say no it's not. EVER. Now hear me out before you go to the barn for your pitchforks.
1st - Technically it is kind of right. WITHIN a certain range. Whatever the +/- spec is for every lot ever made.
2. Now to the meat of it. XYZ powder company made a load manual in 19xx that said zz grains of XYZ for a .388 SuperBlast with yy grain bullet. Today they have no idea if a customer is using a current manual, old manual, or somewhere in between. Or, is just using his favorite load from way back then. If they made XYZ different enough that it wasn't safe following normal loading practices (the old 10% reduction disclaimer) then lawyers would have a field day if anything went wrong. They just can't make it different for liability reasons. Yes, the newer manuals keep getting lower and lower. That may be better testing, or it may be lawyering up, but it can't be that much different.
3. It may have a different formula, but it will be in the same burn rate +/- as it always had, within range as stated, or they are setting themselves up to go to court.
If it is different enough that the old data is somehow completely unsafe they would have to rename it to prevent any accidental misuse.
1st - Technically it is kind of right. WITHIN a certain range. Whatever the +/- spec is for every lot ever made.
2. Now to the meat of it. XYZ powder company made a load manual in 19xx that said zz grains of XYZ for a .388 SuperBlast with yy grain bullet. Today they have no idea if a customer is using a current manual, old manual, or somewhere in between. Or, is just using his favorite load from way back then. If they made XYZ different enough that it wasn't safe following normal loading practices (the old 10% reduction disclaimer) then lawyers would have a field day if anything went wrong. They just can't make it different for liability reasons. Yes, the newer manuals keep getting lower and lower. That may be better testing, or it may be lawyering up, but it can't be that much different.
3. It may have a different formula, but it will be in the same burn rate +/- as it always had, within range as stated, or they are setting themselves up to go to court.
If it is different enough that the old data is somehow completely unsafe they would have to rename it to prevent any accidental misuse.