Temperature stable 45/70 load

[Cletus26]

I am looking for a temperature stable powder recommendation for 300 grain 45/70. I have an accurate load using AA1680 and Barnes 300gr tsx but from +10c to -15c I see 5” of vertical change at 100 yards from velocity change. I’d really like to not have to adjust aim for temperature. Rifle is a Remington Marlin 1895 SBL.
Thanks

 

[saskgunowner101]

I am looking for a temperature stable powder recommendation for 300 grain 45/70. I have an accurate load using AA1680 and Barnes 300gr tsx but from +10c to -15c I see 5” of vertical change at 100 yards from velocity change. I’d really like to not have to adjust aim for temperature. Rifle is a Remington Marlin 1895 SBL.
Thanks

Curious where you load stands compared to the min-max load data. I've had extreme vertical stringing before with other powders when I colored outside the lines aka wrong powder/low charge/light bullet. Below minimum charge by chance?

 

[boxhitch]

That sounds like about a 1000 fps diff in velocity, wow