Magpro Powder

[FEENIX]

Litz is smart, Applied Ballistics is pretty spot on and corrects for environment perfectly. I've checked my dope at ~ 8000' 40° in WY after load development at 675' 50° in WV and it was dead on, at 475 yards with a FV 25 mph cross wind.

Found that out in my 7mag. Got load right for WY, week before I leave I check it and it lost 30 fps from 80 to 50 degrees.

Yes, Bryan is the man! Now that you have provided the actual altitude, what do you get using your AB for the information below?

Load development environment: 675' at 80°F

Vs.

Hunting environment: 8000' at 50°F

 

[SSG Graybush]

Yes, Bryan is the man! Now that you have provided the actual altitude, what do you get using your AB for the information below?

Load development environment: 675' at 80°F

Vs.

Hunting environment: 8000' at 50°F

For H1000 at listed altitudes and temps, 50% RH, 10 mph FV wind. 7mag- 2917 fps 180 gr vld-h. I have .31 fps per degree in AB for H1000. As for spot on in WY, 2 shots on a 18" rock, pretty centered ~ 4" apart, I was getting blown around, cold bore and follow up at 475 yards/25 mph FV wind.
So for RL 26 and Magpro it would be triple the variance at 1.01 fps per degree. If Magpro is 1.01 fps per degree as I've seen online. I've seen 1 fps per degree with RL26.
In WY I get an average temp for upcoming days and do 1 dope card and tape to scope. With H1000 it's close enough, but with a temp sensitive powder it's not possible. You'd have to run #'s real time for AB to compensate for fps variance due to powder temp sensitivity/change in fps.

 

[FEENIX]

For H1000 at listed altitudes and temps, 50% RH, 10 mph FV wind. 7mag- 2917 fps 180 gr vld-h. I have .31 fps per degree in AB for H1000. As for spot on in WY, 2 shots on a 18" rock, pretty centered ~ 4" apart, I was getting blown around, cold bore and follow up at 475 yards/25 mph FV wind.
So for RL 26 and Magpro it would be triple the variance at 1.01 fps per degree. If Magpro is 1.01 fps per degree as I've seen online. I've seen 1 fps per degree with RL26.
In WY I get an average temp for upcoming days and do 1 dope card and tape to scope. With H1000 it's close enough, but with a temp sensitive powder it's not possible. You'd have to run #'s real time for AB to compensate for fps variance due to powder temp sensitivity/change in fps.

According to your table, if I understand correctly, at 1000Y, it is a velocity gain (not lost) of 201 FPS transitioning from 675' elevation at 80°F to 8000' at 50°F. So, yes, you must adjust to the changing real-time environmental information to acquire your best dope.