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[Bulletbob]

If you get angry with me asking questions just say so and I will quit. I don't know much about pellet rifles and when I can't find an answer I ask folks that know more than me.

It has been hot and muggy and lot of rain around these parts and I keep my rifles in the AC. so when I take a rifle out for a session I have to wait for it to warm up. fog on my scope lens and bead of water on the metal parts. So my point of impact has moved with both of my wood stock rifles. Could it be the moister in the air causing this. I know pellet rifles are senisitive. This is with good pellets and the pellet it is sighted in with.I never had this problem with firearms.

Thank You

God Bless

Bobby

 

[Digger25]

Expansion and contraction with ambient temps

 

[Glenroiland]

I agree about not having this problem with my firearms. I absolutely have to "acclimate" my airguns to ambient temperature when I go from AC to outside. Once acclimated, my POI is VERY CLOSE to my previous POI.

 

[bdzjlz]

Are you referencing a spring powered gun pcp?

My springer collection of rifles seem to be much more sensitive to temperature and humidity shifts than do the rifles in my pcp collection. I think it is more than moisture in the wood, if that is it at all because all of my stocks are pretty well finished and sealed. I think it had more to do with the impact of temperature shifts applicable to the rifle’s various metal components affecting power plant. My pcps remain absolutely perfect and once the scope fog clears, are always dead zero.

 

[Odoyle]

What specific airguns are you referring to?

 

[Bulletbob]

Odoyle;

I have a Hatsan 95 and a Benjamim Rushmore both in.22. I have a Gamo Whisper in a plastic and it don't care about the weather or how it is held just feed it H&N barracudas and it hums right along. Which caused me to think it was the water in the air.

Thanks for the replies

God Bless 

Bobby

 

[Don.Chipmunk-slayer]

My grandfather always sighted his rifles in whatever weather he planned on hunting in... If he was going to hunt in the colder months, he would sight it in when it was cold outside and wait between shots until the barrel was cold again since when he was hunting, his rifle and barrel would be ice cold on the first shot and he knew that the temperature/weather could and would change his point of impact.

What you're seeing is completely normal, if you're taking your rifles from a cold area to a warm/hot area (or vice-versa), just give them 15 minutes or so to "adjust" to the new conditions. If you try to shoot immediately, your Point of Impact is going to be a bit goofy until the rifles are "used to" the ambient temps.

 

[Deerstalker]

I have exactly the same problem with my HW95 when coming out of a 70 degree house into a 90 degree 80% humidity environment. The POI is all over the place until the rifle becomes acclimated and then the POI returns and groups tighten up. But of course the mosquitoes and the 81+ years young also have an affect. 

Anyone that gets angry with your questions can go pound sand. Lots of folks here welcome any questions you may have. 

 

[Odoyle]

What if you have the stocks bedded to the actions?

 

[Mossonarock]

With telescopes for astronomical viewing, generally its recommended to let the telescope acclimate to the night time temperature before trying to focus in on whatever objects you are trying to view. No doubt the same could be true with gun scopes. My shooting isn't that tight for me to notice anyway.