Powder temp sensitivity

Step one done... see velocity vs powder charge at room temp data below.  This was done with a 167 gr bullet.  Green coloumns are the loads that cycled easially my heavy slide with an aimpont 9000 on it.  hopefully in the next week or so I'll add more data at differing temperatures.  if anyone wants the spreadsheet, happy to share, just don't know how to attach data other than pictures.  It is nice to see we're operating in essentially a linear regime.

Thanks,
I’ll be interested in seeing haw they all react. 

By the way, what is Comp?

Comp I Ramshot competition... not real common, but a pretty good powder

Heres data for 11 deg Farenheight.  test protocol,  place all ammo (in boxes) overnight in freezer. uitlize softside cooler with frozen gell packs arround all sides. place all ammo in the cooler and head to the range.  remove one box of ammo, place it between two gel packs to keep cold. read temp with hand held IR temp gun. remove one cartridge place it manually in the chamber and shoot as quickly as safely possible. velocities collected with a lab radar chrono. I might have to change powders as I have a LOT of Ramshot Comp and E3 for shotgun stuff...

Thanks for doing this and posting it.   What primer are you using?

Good old WLP...

So the E3 is pretty temp stable?

Looks that way to me... comp, E3 and clays seem to be the stable ones. I won't shoot clays as it meters horribly at low charges. Doesn't seem to have any worse performance, but...