VV temp stability coatings?

[Acyr]

I know that I have some that was drastically different burn rate wise in that time frame...from 2014-2016. So that's probably about right but they were still working on the formulations. I've been told that bismuth would speed the burn rate up. Not sure, just what I was told.

This is my recent testing of 2019 N150 vs 2015 N150. New formula vs old formula. Huge difference in speed.
I am going to test a 2023 batch of N 150 this Sunday.

 

[linebaugh]

If it changed in 2016 it is still temp sensitive. I was very hard and heavy in cf prs back then and I changed to the N series due to cooler burn and better barrel life on my .224 caliber chamberings about that time. While it was temp sensitive it never bothered me as I loaded my temp offsets into my strelok (at the time) and it tracked very well.
Not your question but I have seen some impressive groups and SD on the VV powders. If you run kestrel or strelok and can live with running the temp/velocity offsets you will be happy I believe. Many powders can produce so keep that in mind.
I just did it for low BTU and barrel life. That was back when nobody I knew ran VV powder or .224 heavies in PRS. Turns out I have taken a reasonable life turn toward VV powders. I still run 4350, 4895 and varget but there has been a major shift in my powder supply. If the prices I see on here persist for hodgdons there will be more changes in my cabinet.

 

[TIMO]

They put it on the bottle when they changed the formula.

The jug of N130 I received this week is label the same.
Tim

 

[Acyr]

This is my recent testing of 2019 N150 vs 2015 N150. New formula vs old formula. Huge difference in speed.
I am going to test a 2023 batch of N 150 this Sunday.

Tested the 2023 lot of N150 today. All three used the same charge, primer and brass. Was 5 degrees cooler today. 308 Lapua Palma brass, CCI41 primer, Berger 215 Hybrid bullet.

From left to right 2023, 2019, 2015.
2015 is the older formulation and much slower.