Velocity "honey nodes/velocities" in typical bench gun barrels for 6mm

[Bradley Walker]

Obviously, that is what I meant.

I think that all that matters is hitting the tune.

 

[Erik Cortina]

I would have to disagree if that is the case. If that were true, it would be common knowledge and no competitive shooter would ever put a bullet in or jamming in the lands. However, I know more than a few very good shooters that have tried jumping without success. If you ever read Tony Boyer's book, he talks about never jumping bullets due to inconsistent accuracy. So that tells me I am not alone on this.

 

[Killshot]

If DA goes up decrease the load; if DA decreases increase the load. The formula is .3 grains per 500 feet DA. Since temperature is the main reason for changes in DA you can accomplish the same thing by using only a thermometer. The ratio is .3 grains per five degrees F


Interestingly, to me this makes perfect sense.
DA up means there is more oxygen in the air so less fuel is required to reach the same explosion.

DA down means there is less oxygen in the air so more fuel is required.

This is EXACTLY the same way an ENGINE IS TUNED!!

The reference to DA has nothing to do with combustion-rate of the cartridge or your powder charge - it is not similar to engine tuning.
Density Altitude is an atmospheric construct. In a high-DA setting the bullet has less resistance/drag going from muzzle to target. In a lower-DA the opposite is true, it encounters more drag. Similar to the changes in air density when elevation is increased.

DA changes are why most had to play with charge weights as the temps change, and why the "Extreme" powders like Varget were created. (though I won't vouch for any powder maker)

 

[Webster]

The oxygen is contained in the powder. It doesn't need oxygen from the atmosphere if I understand what you are saying.

 

[Bradley Walker]

I would have to disagree if that is the case. If that were true, it would be common knowledge and no competitive shooter would ever put a bullet in or jamming in the lands. However, I know more than a few very good shooters that have tried jumping without success. If you ever read Tony Boyer's book, he talks about never jumping bullets due to inconsistent accuracy. So that tells me I am not alone on this.

Im sorry. I thought you were joking.

Of course the position of the bullet in the chamber is important. For reasons unknown to me some bullets like jump and some like to be in the lands.

 

[Bradley Walker]

If DA goes up decrease the load; if DA decreases increase the load. The formula is .3 grains per 500 feet DA. Since temperature is the main reason for changes in DA you can accomplish the same thing by using only a thermometer. The ratio is .3 grains per five degrees F


Interestingly, to me this makes perfect sense.
DA up means there is more oxygen in the air so less fuel is required to reach the same explosion.

DA down means there is less oxygen in the air so more fuel is required.

This is EXACTLY the same way an ENGINE IS TUNED!!

The reference to DA has nothing to do with combustion-rate of the cartridge or your powder charge - it is not similar to engine tuning.
Density Altitude is an atmospheric construct. In a high-DA setting the bullet has less resistance/drag going from muzzle to target. In a lower-DA the opposite is true, it encounters more drag. Similar to the changes in air density when elevation is increased.

DA changes are why most had to play with charge weights as the temps change, and why the "Extreme" powders like Varget were created. (though I won't vouch for any powder maker)

K.

In fact it's the opposite. The first Beggs article confused me.

I like the temperature relation the best. .3 grains per 10 degrees. I would say that still applies to most 6 br loads.

 

[Bradley Walker]

Of course all of these companies claim to have temperature insensitive powder.

 

[Flouncer]

As mentioned, the powder contains, or is, it's own oxygen source. It will burn in the vacuum of space and underwater, right ? (no, I haven't been in space)