Temperature impacting bullet stabilizaition??

[flyboy1788]

So today I heard for the first time that weather plays a role in stabilizing projectiles. For example, if my M&P 15 with a 1/9 twist barrel stabilizes a certain type of 75 grain bullet in 70+ degree weather, it wont stabilize that same projectile once the temp drops past a certain point. How legitimate is this claim? Does anyone know of any information resources that explain this more in depth? I couldnt find anything on temperature affecting stabilization anywhere fyi.
Thanks

[dewatters]

The USAF report from 1963 that led to the switch from 1:14" to 1:12" was recently posted online at DTIC. DTIC also has an Aberdeen report from 1968 that covers the same territory.

Exterior Ballistics of the AR-15 Rifle (http://handle.dtic.mil/100.2/AD296754) (1963)
Comparison of the Exterior Ballistics of the M193 Projectile when Launched from 1:12 In. and 1:14 In. Twist M16A1 Rifles (http://handle.dtic.mil/100.2/AD844934) (1968)

[Smuckatelli]

I can't remember exactly what formula we were using with the M-40, I recall that a rise of 10 degrees had an effect on the impact of the round.

Here's a link to what they are teaching at the Weapons Training Battalion:

http://www.lejeune.usmc.mil/wtbn/WTBN%20Preparatory%20Training%20Classes/CMC-21R%20ANALYZING%20THE%20EFFECTS%20OF%20WEATHER%20LP.doc

[bkb0000]

all i can tell you is that i dont shoot as well when its wet and cold. and that's not just me being wet and cold, thats me shooting from a heated and covered firing line into the colt and wet. i shoot even worse when i'm colt and wet.

[Heavy Metal]

Cold air is a denser medium.

It is simple science.


The denser the medium, the greater spin to stabilize thru said medium.

[dhrith]

Cold air is a denser medium.

It is simple science.


The denser the medium, the greater spin to stabilize thru said medium.

+2




It's not so much the "weather" as you are having a hard time seeming to justify, it's what the weather does to the density of the air.