Overgassing in hot weather temperatures?

**ta0117** · 07-18-21, 20:25

Something I'm noticing is that in the spring time and moderate weather, my gun eject at about 3 o'clock or so. However when it's summer and the temperature is in the 90s and my gun was sitting in the sun for a while, my ejection is now closer to 2 o'clock and also "feels" more gassy. I'm shooting the same batch of ammo. Does the temperature have effect on gas pressure and cycle of operation?

**vicious_cb** · 07-18-21, 20:29

Yes, but its your ammo not your gun. Dont leave your ammo sitting out in the sun or in a hot car.

**mRad** · 07-18-21, 22:02

Most ammo is loaded with temperature sensitive powder. Ball powder is notorious for this phenomenon. One thing handloads chase is loads with powder that is temperature insensitive.

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**Clint** · 07-19-21, 07:23

Yes,

Hot powder burns better than cold powder.

It's just the way it works.

Muzzle velocity is also increased with hot ammo.

If you feel like doing something, go up to the next heavier buffer, which will mostly counteract the additional gassing.

**1986s4** · 07-23-21, 13:12

I only reload pistol ammo but some powder is inverse temperature sensitive.

**Disciple** · 07-23-21, 14:08

Originally Posted by 1986s4

I only reload pistol ammo but some powder is inverse temperature sensitive.

You mean it gets milder as the temperature rises?

**gaijin** · 07-23-21, 15:33

Yes. There were/are Pistol powders that exhibit this; 452AA was one that was used in the dark ages in IPSC.
The cooler the temp, the higher the velocities.

Rifle powders, unless temperature INsensative, run slower in cold/quicker in hot weather/temps.