ASSRA Forum › General › Reloading the Single Shot Rifle › Temperature Changes
(Moderator Group: Moderator)
‹ Previous Topic | Next Topic ›
Page Index Toggle Pages: [1] 2  Send TopicPrint
Very Hot Topic (More than 25 Replies) Temperature Changes (Read 7408 times)
JLouis
Frequent Elocutionist
*****
Offline



Posts: 10625
Joined: Apr 8th, 2009
Temperature Changes
Sep 18th, 2020 at 4:18pm
Print Post  
I was curious if anyone other than myself also adjusts their powder charge settings to keep their rifles in tune. I do adjust mine for every 10 degrees of a temperature change.
  
" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
Back to top
 
IP Logged
 
RSW
Frequent Elocutionist
*****
Offline



Posts: 1188
Location: Arizona
Joined: Sep 8th, 2006
Re: Temperature Changes
Reply #1 - Sep 18th, 2020 at 6:06pm
Print Post  
John
I don't have my powder charge variation pegged to specific 10 degree increments as you do but I do back off a few tenths from my normal warm temperature  load when it gets really hot. I kick in a few tenths increase when the temps go from warm to cool. It never seems to get very cold here in the desert so I don't have a load for cold weather. I do agree that varying the powder charge to suite the temperature does help keep a rifle in tune.
  
Randy W
ASSRA 10211  -  ISSA 125
There are indeed two Americas. Simply put, it is not the haves and have nots. The two Americans are in reality divided into those who do and those who don't.
Back to top
WWW  
IP Logged
 
westerner
Frequent Elocutionist
*****
Offline


deleted posts and threads
record holder.

Posts: 11463
Location: Why, out West of course
Joined: May 29th, 2006
Re: Temperature Changes
Reply #2 - Sep 18th, 2020 at 6:39pm
Print Post  
No. I do change lubes.
  
A blind squirrel runs into a tree every once in a while.
Back to top
 
IP Logged
 
Cbashooter
Frequent Elocutionist
*****
Offline



Posts: 1572
Location: Eastern Wa.
Joined: Mar 31st, 2018
Re: Temperature Changes
Reply #3 - Sep 19th, 2020 at 4:18pm
Print Post  
westerner wrote on Sep 18th, 2020 at 6:39pm:
No. I do change lubes.


I do the same  I have a summer and a Winter lube
I do adjust powder charges slightly on a couple of guns because I find they shoot the best when the bullet holes just start to print round and open up if velocity gets a bit too high. I probly could just pick a load middle of the road but I like loading with my belding and mull on the bench.

  
Back to top
 
IP Logged
 
bnice
Frequent Elocutionist
*****
Offline



Posts: 1851
Location: Iowa
Joined: Nov 30th, 2006
Re: Temperature Changes
Reply #4 - Sep 19th, 2020 at 10:00pm
Print Post  
Yep, I adjust we go from outdoor to indoor  Grin
  
Back to top
 
IP Logged
 
boats
Frequent Elocutionist
*****
Offline



Posts: 7547
Location: Virginia
Joined: Apr 23rd, 2004
Re: Temperature Changes
Reply #5 - Sep 20th, 2020 at 5:42am
Print Post  
Using fixed 38/55 or 32/40  offhand 200 yard matches.  I adjust as much a 2 moa to keep Strike pattern zeroed. 4227 with temp variance roughly 30 degrees to 90. Morning to mid day cold start, warming up always take a minute off the sight. .22 Rimfire at 100 needs roughly the same correction.

Bench adjusting on individual strikes easier to read and probably needs a bit more to compensate For temperatures 

Boats
  
Back to top
 
IP Logged
 
JLouis
Frequent Elocutionist
*****
Offline



Posts: 10625
Joined: Apr 8th, 2009
Re: Temperature Changes
Reply #6 - Sep 20th, 2020 at 2:23pm
Print Post  
Ten degrees in temperature change isn't written in stone but just a rough estimation Randy. What I play real close attention too is my verticle dispersion and not so much the temperature itself. When I see my vertical dispersion starting to increase and typically due to a temperature change. I will then adjust my load accordingly to maintain the least amount of vertical dispersion. Prior to shooting any record targets I will first adjust for the least amount of verticle dispersion for that particular day on my sight in target.
  
" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
Back to top
 
IP Logged
 
CajunRebel
Oldtimer
*****
Offline



Posts: 691
Location: Alexandria, VA
Joined: Nov 18th, 2007
Re: Temperature Changes
Reply #7 - Sep 20th, 2020 at 2:26pm
Print Post  
Now you have ballistics programs that can take into account the variance between zeroing and current temperature.
  
Back to top
 
IP Logged
 
Cbashooter
Frequent Elocutionist
*****
Offline



Posts: 1572
Location: Eastern Wa.
Joined: Mar 31st, 2018
Re: Temperature Changes
Reply #8 - Sep 20th, 2020 at 7:29pm
Print Post  
CajunRebel wrote on Sep 20th, 2020 at 2:26pm:
Now you have ballistics programs that can take into account the variance between zeroing and current temperature.


Ya but having a tablet or smartphone on the bench with a schuetzen is sacrilege...

The young fellers at our range cant stop looking at their phone shooting apps and spend less time getting actual trigger time.
 
  
Back to top
 
IP Logged
 
JLouis
Frequent Elocutionist
*****
Offline



Posts: 10625
Joined: Apr 8th, 2009
Re: Temperature Changes
Reply #9 - Sep 20th, 2020 at 9:05pm
Print Post  
A sighter target can tell you what a Phone APP just cannot if you are shooting in a Schuetzen benchrest match.
  
" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
Back to top
 
IP Logged
 
Cbashooter
Frequent Elocutionist
*****
Offline



Posts: 1572
Location: Eastern Wa.
Joined: Mar 31st, 2018
Re: Temperature Changes
Reply #10 - Sep 20th, 2020 at 9:38pm
Print Post  
JLouis wrote on Sep 20th, 2020 at 9:05pm:
A sighter target can tell you what a Phone APP just cannot if you are shooting in a Schuetzen benchrest match. 

Agree.the target speaks. I was out this morning with a couple of different weight bullets and I just started low on my powder charge and worked my way up until the groups got round.easy,no technology required
  
Back to top
 
IP Logged
 
JLouis
Frequent Elocutionist
*****
Offline



Posts: 10625
Joined: Apr 8th, 2009
Re: Temperature Changes
Reply #11 - Sep 20th, 2020 at 9:49pm
Print Post  
Yes Sir but I am not just looking for round holes but the least amount of verticle dispersion. If one doesn't have it down to at least around an inch. There is not much hope of getting all of the shots inside of the one and a half inch 25 ring. Or for shooting tens and X's in CBA competition.
  
" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
Back to top
 
IP Logged
 
Old Soldier
Senior Forum Member
****
Offline



Posts: 279
Location: North Pole, Alaska
Joined: Oct 17th, 2015
Re: Temperature Changes
Reply #12 - Oct 4th, 2020 at 8:51pm
Print Post  
I just quit shooting at about 30 below. Easier that way.
  
"White man have very strong Medicine. Shoot today maybeso kill you tomorrow." Esa-Tai Commanche warrior
Back to top
 
IP Logged
 
40_Rod
Frequent Elocutionist
*****
Offline


Extremism in the persuit
of accuracy is not a
vice

Posts: 4285
Location: Knoxville, TN
Joined: Apr 20th, 2004
Re: Temperature Changes
Reply #13 - Oct 8th, 2020 at 11:58am
Print Post  
I end up ajusting for temp changes and elevation changes. My gun shoots differently in Tennessee and Indiana.

40 Rod
  
Back to top
 
IP Logged
 
Old Soldier
Senior Forum Member
****
Offline



Posts: 279
Location: North Pole, Alaska
Joined: Oct 17th, 2015
Re: Temperature Changes
Reply #14 - Oct 8th, 2020 at 12:43pm
Print Post  
I have noticed that my shooting really goes south in the cold with a .308 sniper rifle I have. Cold being under -10F. I asked about this on a sniper forum, and was advised to keep the ammo warm in a cooler.(Good advice was scant as most folks don't shoot in these temps.) We know that cold ammo shoots slower, and hot ammo faster. Do you guys think the barrel harmonics change with the temp? Or only the ammo?
I know that dragging a warm rifle out into the cold, makes things go WILD until the rifle cools off. I've tried cold soaking the rifle, and that was better. I'm leery of loading hotter ammo for the winter, we have way too much temperature variation where I live. It would be inviting a disaster.
  
"White man have very strong Medicine. Shoot today maybeso kill you tomorrow." Esa-Tai Commanche warrior
Back to top
 
IP Logged
 
Page Index Toggle Pages: [1] 2 
Send TopicPrint
‹ Previous Topic | Next Topic ›
 
  « Board Index ‹ Board Top  

ASSRA Forum » Powered by YaBB 2.6.12!
YaBB Forum Software © 2000-2024. All Rights Reserved.

Valid RSS Valid XHTML Valid CSS Powered by Perl Source Forge

Page completed in 1.1257 seconds.