Was out today and my dope at 200 wasn't working. Does anyone know how temperature sensitive Eley Target is? I was shooting at 26°F.
Temperature sensitivity of Eley Terget ammo?
- Thread starter TimK
- Start date
Re: Temperature sensitivity of Eley Terget ammo?
The cooler it gets the faster the speeds I use .....
You are just going to have to dial more elevation or go to a hotter round
The cooler it gets the faster the speeds I use .....
You are just going to have to dial more elevation or go to a hotter round
Re: Temperature sensitivity of Eley Terget ammo?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tuna921</div><div class="ubbcode-body">The cooler it gets the faster the speeds I use .....
You are just going to have to dial more elevation or go to a hotter round
</div></div>
That doesn't make sense to me. Are you saying it's faster when it gets cold?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tuna921</div><div class="ubbcode-body">The cooler it gets the faster the speeds I use .....
You are just going to have to dial more elevation or go to a hotter round
</div></div>
That doesn't make sense to me. Are you saying it's faster when it gets cold?
Re: Temperature sensitivity of Eley Terget ammo?
He's saying he uses a higher velocity rd. to compensate.
He's saying he uses a higher velocity rd. to compensate.
Re: Temperature sensitivity of Eley Terget ammo?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ltfirehunter</div><div class="ubbcode-body">He's saying he uses a higher velocity rd. to compensate. </div></div>
OK, now it makes sense. Gotta quit drinking so early...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ltfirehunter</div><div class="ubbcode-body">He's saying he uses a higher velocity rd. to compensate. </div></div>
OK, now it makes sense. Gotta quit drinking so early...
Re: Temperature sensitivity of Eley Terget ammo?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ltfirehunter</div><div class="ubbcode-body">He's saying he uses a higher velocity rd. to compensate. </div></div>
The air is thicker when its cold so yes I use faster ammo.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ltfirehunter</div><div class="ubbcode-body">He's saying he uses a higher velocity rd. to compensate. </div></div>
The air is thicker when its cold so yes I use faster ammo.
Re: Temperature sensitivity of Eley Terget ammo?
My question is about the temperature sensitivity of the powder in Eley ammo, not density changes of the air.
My question is about the temperature sensitivity of the powder in Eley ammo, not density changes of the air.
Re: Temperature sensitivity of Eley Terget ammo?
Biathlon competitors use special loads formulated for cold weather.
There's thread on a biathlon forum with a fellow from warmer climes, but still able to ski, went to a comp in a cold place and couldn't get his Fed or whatever to group. An experienced competitor gave him a box of Polar or Biathlon, with a resulting improvement in accuracy.
At lower elevation and higher temp, the usual load had been fine.
Biathlon competitors use special loads formulated for cold weather.
There's thread on a biathlon forum with a fellow from warmer climes, but still able to ski, went to a comp in a cold place and couldn't get his Fed or whatever to group. An experienced competitor gave him a box of Polar or Biathlon, with a resulting improvement in accuracy.
At lower elevation and higher temp, the usual load had been fine.
Re: Temperature sensitivity of Eley Terget ammo?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tim K</div><div class="ubbcode-body">My question is about the temperature sensitivity of the powder in Eley ammo, not density changes of the air. </div></div>
I have no clue to the primer and the effects of the cold. To test that you could leave a box in your car with the heat on take it out and shoot it. Then have a box outside in the cold and shoot that one. I would try it but right now it's around 75 here during the day. The density is going to make an impact because the round takes a long time to get to 200 yards. How far are your shots missing by ? The barrel being cold will also have some effect, Does the bullet keep moving up as it warms ?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tim K</div><div class="ubbcode-body">My question is about the temperature sensitivity of the powder in Eley ammo, not density changes of the air. </div></div>
I have no clue to the primer and the effects of the cold. To test that you could leave a box in your car with the heat on take it out and shoot it. Then have a box outside in the cold and shoot that one. I would try it but right now it's around 75 here during the day. The density is going to make an impact because the round takes a long time to get to 200 yards. How far are your shots missing by ? The barrel being cold will also have some effect, Does the bullet keep moving up as it warms ?
Re: Temperature sensitivity of Eley Terget ammo?
http://www.biathlon.net/low_temp.html
http://biathlon.teamusa.org/blogs/jay-hakkinen-s-blog/posts/801-lapua-ammo-testing
http://www.biathlon.net/low_temp.html
http://biathlon.teamusa.org/blogs/jay-hakkinen-s-blog/posts/801-lapua-ammo-testing
Re: Temperature sensitivity of Eley Terget ammo?
I think I'll put some in the freezer today and shoot some over the chrono in the shop.
I think I'll put some in the freezer today and shoot some over the chrono in the shop.
Re: Temperature sensitivity of Eley Terget ammo?
I hate answering my own questions, but here it is. I tested at 5°F and 65°F. The average was 10 fps slower for the cold test, basically, 1035 fps vs 1025fps.
It definitely doesn't explain why the ammo didn't match up with my dope...
I hate answering my own questions, but here it is. I tested at 5°F and 65°F. The average was 10 fps slower for the cold test, basically, 1035 fps vs 1025fps.
It definitely doesn't explain why the ammo didn't match up with my dope...
Re: Temperature sensitivity of Eley Terget ammo?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: frog5215</div><div class="ubbcode-body">Are we talking POI or groups? </div></div>
Sorry for being dense, but I'm not sure I understand the question.
My original problem is that my POI's don't match up to the dope predicted by my ballistic software. In fact, it's not even very close. It's surprising to me because the same program has been dead nuts on for at least 3 other rifles. I was hoping that the muzzle velocities were down due to the cold as that would have explained the discrepancy. The lack of change in MV due to temp means that there is some other issue.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: frog5215</div><div class="ubbcode-body">Are we talking POI or groups? </div></div>
Sorry for being dense, but I'm not sure I understand the question.
My original problem is that my POI's don't match up to the dope predicted by my ballistic software. In fact, it's not even very close. It's surprising to me because the same program has been dead nuts on for at least 3 other rifles. I was hoping that the muzzle velocities were down due to the cold as that would have explained the discrepancy. The lack of change in MV due to temp means that there is some other issue.
Re: Temperature sensitivity of Eley Terget ammo?
As an Ugly Flatlander, this discussion is all theoretical to me.
I assume now that your problem is low impact?
The reading I have done indicated a problem with loss of accuracy rather than just velocity.Could be priming, powder or lube.
Check my links above; try different ammo. Maybe call the OTC in Colo Spgs and talk to some biathlon guys.
Are the 3 other rifles centerfires?
As an Ugly Flatlander, this discussion is all theoretical to me.
I assume now that your problem is low impact?
The reading I have done indicated a problem with loss of accuracy rather than just velocity.Could be priming, powder or lube.
Check my links above; try different ammo. Maybe call the OTC in Colo Spgs and talk to some biathlon guys.
Are the 3 other rifles centerfires?
Re: Temperature sensitivity of Eley Terget ammo?
I read you links, thanks. I'm going to the OTC on Tuesday to shoot with some of those guys and I'll ask there as well. The other three rifles were indeed centerfires.
I read you links, thanks. I'm going to the OTC on Tuesday to shoot with some of those guys and I'll ask there as well. The other three rifles were indeed centerfires.
Re: Temperature sensitivity of Eley Terget ammo?
Here is a link about Eley written by Bob Collins
http://www.benchrest.com/csaccuracy/eleybythenumbers.html
and a thread on 200 yard dope
http://www.rimfireaccuracy.com/Forums/showthread.php/120-Come-ups-for-200-yds
Here is a link about Eley written by Bob Collins
http://www.benchrest.com/csaccuracy/eleybythenumbers.html
and a thread on 200 yard dope
http://www.rimfireaccuracy.com/Forums/showthread.php/120-Come-ups-for-200-yds
Re: Temperature sensitivity of Eley Terget ammo?
Some of the problem in the winter is the lube. The wax/tallow lube is thicker. The ammo is cold, your barrel is cold things slow down. A rimfire barrel really never seems to get hot to me.
Some of the problem in the winter is the lube. The wax/tallow lube is thicker. The ammo is cold, your barrel is cold things slow down. A rimfire barrel really never seems to get hot to me.
