How much does temperature and/or humidity change affect point of impact?
I was at the range today shooting my Remington 700 308 Win. (and a few other non-precision hunting rifles). It shot great, nice sub-MOA groups as always. However, my groups were all .5" to .75" higher then usual.
I last adjusted my zero in mid June when I switched from FGMM 168 gr. to FGMM 175 gr. It was around 65° with no real noticeable humidity or dew point (not that humidity/dew points are too noticeable with 65° temps.). Today it was about 85° with 68% humidity with dew points in the upper 50's with no wind to speak of.
Would the extra 20 degrees with a little more humidity and higher dew points make the rifle shoot a tad higher?
Thanks, NYH1.
How much does temperature and/or humidity change affect point of impact?
Google - why rifles zero wander. Interesting read.
You can drop the temp and humidity changes into a ballistic solver and note the poi changes, but not likely at 100.
Note that temp can change velocity, particularly in temperature sensitive powders. Most ballistic solvers have the ability to input different velocities for different temps and adjust accordingly. 20 FPS is a fair amount.
How much does temperature and/or humidity change affect point of impact?
If your groups are rising it could be a couple things, either cumulatively or independently. First being mirage, next being powder/barrel temp.
Humidity gives resistance to the bullet as it travels through the air so you could notice a drop when shooting longer ranges. I really don’t have experience with altitude variation so I couldn’t say for sure without going to my reference material.
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