Reloader 16 loads

[k80skeet]

Is anyone using the new Reloader 16 in their 6mmbr's ??? I am just looking for some recommendations as there isn't a lot of data out on it yet. I have a 1 in 8 twist Brux 1.35 X 30"

 

[gilmillan1]

Same as 4350

 

[swd]

For a straight BR and BRA it's too bulky and I couldn't get enough in the case to make any speed. But it's my go to powder in my BRX and Dasher.

 

[Willow]

I'd be sticking with RL15 when it comes to the BR case. I've got some RL16 to try in a 6XC given the extra boiler room.

 

[TomL]

Is anyone using the new Reloader 16 in their 6mmbr's ??? I am just looking for some recommendations as there isn't a lot of data out on it yet. I have a 1 in 8 twist Brux 1.35 X 30"

I was wondering the exact same thing. I am using RL-15 in my 6mm BR, and getting great results, 150 fps faster than Varget, but RL-15 is temp sensitive. It is running 50 fps slower from 85 degrees to 40 degrees.
I use RL-16 in my 6.5 creedmoor and there is virtually no change in velocity with temperature change and single digit SDs. I would love to use RL-16 in my 6mm br, but havent seen any loads listed.

 

[urbanrifleman]

I use RL-16 in my 6.5 creedmoor and there is virtually no change in velocity with temperature change and single digit SDs.

I don't see how that would be possible no matter what the powder since bullet velocity is air density dependant. Bullets go slower in denser air and go faster in thinner air. I don't care what powder you use...

 

[Mulligan]

I don't see how that would be possible no matter what the powder since bullet velocity is air density dependant. Bullets go slower in denser air and go faster in thinner air. I don't care what powder you use...

Just a question,
How much difference does air density make at the muzzle? I can “reason” that it could and would make a difference down range, however at the muzzle, is there a difference? I have not tested this.
CW

 

[urbanrifleman]

Just a question,
How much difference does air density make at the muzzle? I can “reason” that it could and would make a difference down range, however at the muzzle, is there a difference? I have not tested this.
CW

Density is the reason people have to "tune" at all for changing conditions.

Density is all around us... Everywhere, including at the chamber, in the barrel, etc etc It is the force pressing against everything. The more air in the air, the more it presses, and conversely the less air in the air, the less it presses. Anyone that comes from an aviation background knows that wings (or projecticles) are affected by density.

Bullets in thicker air go slower... Bullets in thinner air go faster. It is not rocket science yet it is never discussed.

 

[urbanrifleman]

Also.. As the air gets hotter the air gets thinner, and since there is less pressure pushing against the case, you start to see pressure signs you would not see in denser air. This is why you can run hotter loads in the winter. It has nothing to do with the temperature of the powder.

 

[Mulligan]

Density is the reason people have to "tune" at all for changing conditions.

Density is all around us... Everywhere, including at the chamber, in the barrel, etc etc It is the force pressing against everything. The more air in the air, the more it presses, and conversely the less air in the air, the less it presses. Anyone that comes from an aviation background knows that wings (or projecticles) are affected by density.

Bullets in thicker air go slower... Bullets in thinner air go faster. It is not rocket science yet it is never discussed.

Ya, I am familiar with the whole air density thing, I fly a bit myself (wildland firefighter).
I likely did not articulate my question very well. I will try again.
Are the effects of air density reduced by a shorter flight..... in other words, would the effects of air density on bullet velocity be more pronounced at say 500 yards vs 10 feet from the muzzle?
CW

 

[urbanrifleman]

Ya, I am familiar with the whole air density thing, I fly a bit myself (wildland firefighter).
I likely did not articulate my question very well. I will try again.
Are the effects of air density reduced by a shorter flight..... in other words, would the effects of air density on bullet velocity be more pronounced at say 500 yards vs 10 feet from the muzzle?
CW

A bullet in thicker air would slow down more over distance (time).

 

[TomL]

I don't see how that would be possible no matter what the powder since bullet velocity is air density dependant. Bullets go slower in denser air and go faster in thinner air. I don't care what powder you use...

Velocity measured at 10 ft from muzzle - air density not really a factor at that distance.

 

[urbanrifleman]

Velocity measured at 10 ft from muzzle - air density not really a factor at that distance.

Of course it is a factor... It is pressure. Density is pressure.

The force on the bullet begins in the barrel and there is force on the case. It is a pressure vessel.

Density is what changes the velocity. Density is what changes the tune.

 

[TomL]

I don't see how that would be possible no matter what the powder since bullet velocity is air density dependant. Bullets go slower in denser air and go faster in thinner air. I don't care what powder you use...

So your theory is that all bullets will slow down exactly the same with temperature/pressure changes and powder temp has no effect? Then why does RL-15 slow down 50 fps when the temp is 45 degrees colder, but RL-16 only slows down less than 10 fps. Different caliber shouldn't make any difference.

Any way, this is off topic. Anyone using RL-16 in 6MM BR?

 

[urbanrifleman]

Data point of one.

 

[Sheldon N]

The force on the bullet begins in the barrel and there is force on the case. It is a pressure vessel.

Density is what changes the velocity. Density is what changes the tune.

The difference of the pressure in the barrel of 14.6 psi or 14.8 psi is extremely small in comparison to the 60,000 PSI that is inside the case.

It's the temperature of the case/powder that is the largest factor changing the velocity. You can test it yourself, go shooting on a cold day and let some ammo cool down to ambient temperature and let other ammo stay nice and warm in a car or in your pocket. The warmer ammo will shoot faster.

Air density is a big factor in external ballistics, but doesn't really do much in terms of what happens in the barrel. I've traveled and shot at matches from sea level to up at 7000 ft elevation.

 

[oldduc]

The difference of the pressure in the barrel of 14.6 psi or 14.8 psi is extremely small in comparison to the 60,000 PSI that is inside the case.

It's the temperature of the case/powder that is the largest factor changing the velocity. You can test it yourself, go shooting on a cold day and let some ammo cool down to ambient temperature and let other ammo stay nice and warm in a car or in your pocket. The warmer ammo will shoot faster.

Air density is a big factor in external ballistics, but doesn't really do much in terms of what happens in the barrel. I've traveled and shot at matches from sea level to up at 7000 ft elevation.

^^^^ Exactly!
It takes more energy to heat cold gun powder to ignition temp than it does to heat hot gun powder, inside the case. That energy loss equates to less total pressure created by the load. Internal ballistics and external ballistics live in two different worlds.
~Gary