N 135 temp sensitive ?

[WILLIAM PIPPEN]

I`m trying to learn how to drive my Panda 6 BR, 14 twist HART, 68 gr. Ultras @ 100 yards. Group shooting. And I don`t let the gun over heat. It`s shooting well with the tune I have.
Here in Houston summers start in mid 80`s and go to mid 90`s by the time I finish up.

I still have a lot to learn. Bag set up, gun handling, and the big one, reading the wind. Right now, I`m not very consistent. Some groups are tiny & some are not. That`s to be expected.
Temp sensitive would add another variable.

I just don`t know if the temp. rising affects my tune.

Thanks for the help

 

[BP1]

Short answer, yes the temperature does affect your tune, you will just have to learn to adjust your powder charge accordingly.

 

[TexasC]

My supply is all new (recent purchase) and I have not noticed any temp sensitivity. I would rate it as no more temp sensitive than H4895 or Varget. I am however, not sold on the copper fouling reducer claims. I am running 23.6gr under H75gr bthp in LC10 cases, seated way long lit by CCI400 for 300yd F/TR practice. Shooting from 09:00 to 12:00 year round, summer mornings start about 75* ending at about 95*. By then it is cold beverage time adult or otherwise.
TexasC

 

[Mulligan]

I’ve been using N-135 for a few years in a dasher, I have found it to be need the same powder adjustments to stay in tune as H4895.
CW

 

[gpoldblue]

I`m trying to learn how to drive my Panda 6 BR, 14 twist HART, 68 gr. Ultras @ 100 yards. Group shooting. And I don`t let the gun over heat. It`s shooting well with the tune I have.
Here in Houston summers start in mid 80`s and go to mid 90`s by the time I finish up.

I still have a lot to learn. Bag set up, gun handling, and the big one, reading the wind. Right now, I`m not very consistent. Some groups are tiny & some are not. That`s to be expected.
Temp sensitive would add another variable.

I just don`t know if the temp. rising affects my tune.

Thanks for the help

It's not so much the temperature of the powder as it is the changes in the temperature and humidity changes of the ambient atmosphere. Here in north Florida,we have used a chronograph along with temperature/humidity guages during the shooting progression and found that as temp goes up humidity goes down so air density thins and velocity goes up.
If you are loading at the range.you are dealing with another variable compounding the problem. It takes "a LOT" of experience to be able to load at the range with accurate predictablity.
Sounds to me like you're very well.
Good luck and stay safe.

 

[WILLIAM PIPPEN]

I should have added that I am loading at the range. With a Harrell`s.

Yes. I will have to learn.
With that said, would you need to go up on powder, or go down on powder. As it gets warmer ?

 

[Bc'z]

Down

 

[gpoldblue]

I should have added that I am loading at the range. With a Harrell`s.

Yes. I will have to learn.
With that said, would you need to go up on powder, or go down on powder. As it gets warmer ?

Depends on who you talk to......some will say go UP on the powder some will say go DOWN....issue is to get BACK on the node OR go to the NEXT node. When you do you're initial tuning,you also need to find out WHERE on your node you are so you'll know which direction you'll want to go......if you're running a real hot load,you may not want to go to the next node.
Stay safe.

 

[WILLIAM PIPPEN]

This is definitely the place to get the answers.
I was thinking about it, and Bc`s, and gpoldblue answer was what I came up with. Get back to where I was. This tune is a lower node. It has a second ( that shoots just as well ) with more powder, but is a bit hot. When the weather cools off, I can see how it works with the hotter load.

For now I need to get any tune issues out of the way, so I know it`s me and not the gun.

Thanks for all the help

 

[Straightshooter1]

It's not so much the temperature of the powder as it is the changes in the temperature and humidity changes of the ambient atmosphere. Here in north Florida,we have used a chronograph along with temperature/humidity guages during the shooting progression and found that as temp goes up humidity goes down so air density thins and velocity goes up.
If you are loading at the range.you are dealing with another variable compounding the problem. It takes "a LOT" of experience to be able to load at the range with accurate predictablity.
Sounds to me like you're very well.
Good luck and stay safe.

Just to clarify . . . the more humidity in the air the less dense the air becomes, given the same pressure and temperature. It's the heat that really thins out the air. It's hot humid air with lower atmospheric pressure that can really up the velocity during the flight of the projectile. (basic physics) Density Altitude is the factor effecting velocities as it accounts of temperature, humidity and atmospheric pressure.

 

[Bill Norris]

In my testing with my 260AI BR and a load work-up done in the cooler month temps, I have had to add powder in the warmer months to keep the load in tune. Not by much, but in this case I went from 44.5 to 44.8 gr. of H-4350 to maintain 1/4 MOA groups @ 100 yds.

 

[Murray Brook]

I have also been getting great results in my 6Br with N-135 with 64 gr bullets. I haven't noticed a change in the load as the temp rises but I don't live in a real hot place like Texas for example What charge are you using.