What is the least temperature sensitive rifle powder?

IMR 4166 and Varget were the least sensitive powders to temperature-induced bullet velocity changes for 77 grain MatchKing bullets between 34 and 129°F. AR-Comp had the least temperature sensitivity between 68 and 131°F and the smallest standard deviations in velocity.

What is the most temperature stable powder?

The testers measured the velocity of the powders over a wide temperature range, from 25° F to 140° F. Hodgdon H4350 proved to be the most temp stable of the four powders tested.

How does temperature affect gun powder?

The initial burn rate of propellant is affected by the temperature of the propellant. If a propellant is at 70 degrees Fahrenheit (F) and then heated to 120 degrees F, the rate that it initially starts burning will be faster at 120 degrees than it was at 70.

What is temperature sensitivity factor?

Temperature Sensitivity Factor: Accounts for changes in muzzle velocity with changes in temperature. Features custom input or general table with commonly used long-range powders.

Is H4350 temperature sensitive?

You can see Hodgdon H4350 had the least variance in muzzle velocity, with just 25 fps over the 115° swing in temperature! That is very, very low. Hodgdon Varget was the second least temperature sensitive powder in this test, with 46 fps of variance in muzzle velocity between temperatures of 25° F and 140° F.

Is Ramshot Magnum temperature sensitive?

Most of our powders are not insensitive, and will show some effect at hot and cold temperatures. However, we test at -40F and +125F and the deviation in most cases are ca 3% to 5% at these extreme levels.

Is Hodgdon H1000 temperature sensitive?

I agree with the others for starting with H1000 for your Win Mag. And yes, all powders will be temp sensitive to a point.

Is IMR powder temperature sensitive?

IMR 4166 performed very similar to Varget, and proved to be fairly insensitive to large swings in temperature. IMR 4451 had the largest swing in muzzle velocity of the powders tested, but keep in mind just 68 fps over 115° F swing is still a good performance.

Does cold affect gunpowder?

Lower temperatures result in more drag on your bullet, which will open up the disparities shown above even more. Yes, temperature does affect velocity, and it affects some propellants more than others.

At what temperature does smokeless powder ignite?

FIRE AND EXPLOSION DATA: Ignition temperature: 160° – 180° C (320° – 360° F) Decomposition begins at approximately 50oC (122oF) OTHER CONDITIONS TO AVOID Direct sunlight.

How do you calculate temperature sensitivity?

More simply stated, we can calculate the sensitivity of a resistance thermometer by multiplying the resistance of the RTD at the reference temperature R0 (i.e. its calibration temperature) by the Temperature Coefficient of Resistance (TCR, or alpha value) as follows: Sensitivity = KRTD = R0 * α.

Is Varget powder temperature sensitive?

Hodgdon Varget was the second least temperature sensitive powder in this test, with 46 fps of variance in muzzle velocity between temperatures of 25° F and 140° F. IMR 4166 performed very similar to Varget, and proved to be fairly insensitive to large swings in temperature.