50 above zero to 30 below will my

[mikea5232]

Yes I think residential deep freezers probably go down to -20 or so. Either way, I'd think that would be cold enough if there was going to be a change in dimension.

I'll throw a barrel in this evening and take measurements. I'm curious now

 

[284winner]

I'll throw a barrel in this evening and take measurements. I'm curious now

Send me the results

 

[fredo]

Next time ya shoot in the summertime, bring along your winter coat, hat, neck gaiter/face mask & mittens, etc. Prove your POI in summer garb, then put the cold weather gear on & shoot again...

Does anyone expect their POI will stay exactly the same, given the increased LOP, altered cheek weld on stock, trigger manipulation via gloved hand???

Try it for yourself and note any POI shift. That's one 'control' to be acknowledged/accounted for, when trying to figure out what temperature shift does to a rifle/load beyond the mechanics of breaking a consistent shot...

 

[284winner]

Next time ya shoot in the summertime, bring along your winter coat, hat, neck gaiter/face mask & mittens, etc. Prove your POI in summer garb, then put the cold weather gear on & shoot again...

Does anyone expect their POI will stay exactly the same, given the increased LOP, altered cheek weld on stock, trigger manipulation via gloved hand???

Try it for yourself and note any POI shift. That's one 'control' to be acknowledged/accounted for, when trying to figure out what temperature shift does to a rifle/load beyond the mechanics of breaking a consistent shot...

I'm sure that's exactly what will happen. Try the same shooting archery gear. U better practice with that heavy clothing on as well.

 

[Bart B.]

Now, think of how the extra 'padding' might affect length of pull, trigger interface & sight picture.

Sight picture won't have alignment problems

What is never mentioned is at -30 how much the steel in your barrel shrinks making for bore a little tighter. Make sure your loads are not near max you could have a pressure spike.

Calculators on line will show the difference. It's typically .000006" per inch of barrel steel.

Cooler powder temperature offsets a lot of the effects.

 

[fredo]

Sight picture won't have alignment problems

Calculators on line will show the difference. It's typically .000006" per inch of barrel steel.

Cooler powder temperature offsets a lot of the effects.

Consistent picture is only a fraction of the puzzle when considering the mechanics of breaking a clean shot.

Shooters who rely on benches/rests to hold their rifle may not grasp the concept, but those who shoot from a variety of positions, in a variety of amibient conditions (read:clothing) will attest to a potential POI shift due to either/or...

Why do ya think 'accuracy' nuts rely on a fixed bench and mechanical rest to secure their rifles?

Answer: because it negates the "looks nut" being the trigger.

If ya don't think that loose nut is affected by temperature as much or more than metallurgical factors, you're ignoring the elephant in the room...

 

[nmkid]

Gosh, I sure am glad I didn't have to worry about all this when I lived in Wyoming. Sighted the gun in late summer. Hunted deer first and then elk at (many times) -20 or lower temps'.