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Join the contest SubscribeThat’s something else. If anything it would be hitting lower because your bullet is slower but a 1” shift is something else.I live in Oklahoma at 1180 feet and zeroed around 70 degrees on average.
My 300 win mag load shoots 1.25 inches higher at 100 yards when I’m at 10,000 feet and 30 degrees. I have confirmed this on several occasions. Mind you this is my load and obviously different powders/primers/projos will act differently. Now I just zero at home and dial down five clicks.
So yes your zero changes.
I agree that a 100 yard zero makes sense if your scope has exposed turrets. Many hunting scopes do not. In these cases a 100yard zero makes little sense. A 200, 250, or 300 yard makes more sense.Yet another big reason for 100yd zero.
Well that completely changes the context of your post and my responseOne clarification on mine is that on my elk rifle, I’m actually using a 200 yard zero b/c of my reticle. It’s hitting high 1.25 MOA at 200 yards at high altitude having verified on several occasions; presumably b/c air density is less.
It is not accurate to state that it may be off 1.25 at 100 yards as the air difference has not had enough time to impact flight. But what I do is know that I have my rifle normally zeroed 1.5 inches high at 100, then I drop it five clicks to keep a 200 yard zero before heading to the mountains. Then my high altitude 200 yard zero is dead on. My ballistic tables are set off a 200 yard zero.
Sorry to add to the confusion.
My
Mine changed. I brought rifles to CO that were zeroed in FL at about 30 feet ASL. At 6.5k ASL I had a different POIThis may be a stupid question, but here goes. If I zero my rifle at sea level, do I need to re-zero my rifle at let’s say 5000 feet, I’m hunting in the mountains. Does the zero change, I don’t think so.
Do you only check it for peace of mind, in case the scope got bumped etc.
Your gun was zero'ed @ 100y in Florida, verified distance, and it shifted poi at the exact same verified distance?Mine changed. I brought rifles to CO that were zeroed in FL at about 30 feet ASL. At 6.5k ASL I had a different POI
I suppose there could be perhaps a 1 yard difference between the two ranges.Your gun was zero'ed @ 100y in Florida, verified distance, and it shifted poi at the exact same verified distance?
I suppose there could be perhaps a 1 yard difference between the two ranges.
If you feel differently I’m all ears to your explanation.
If your rifle is zero'ed at 100y on a verified range, measured or lasered in FL, and in CO the same measured and lasered 100y. Then I would ask is it the same shooting position, same mirage (shimmer) the experts have shown the ballistics don't change. Change from prone to bench, vice versa, technique change due to training?I suppose there could be perhaps a 1 yard difference between the two ranges.
If you feel differently I’m all ears to your explanation.
If your rifle is zero'ed at 100y on a verified range, measured or lasered in FL, and in CO the same measured and lasered 100y. Then I would ask is it the same shooting position, same mirage (shimmer) the experts have shown the ballistics don't change. Change from prone to bench, vice versa, technique change due to training?I suppose there could be perhaps a 1 yard difference between the two ranges.
If you feel differently I’m all ears to your explanation.
It was only an inch off, slightly right and slightly lower. While the things you mentioned certainly apply, I’d be very surprised if going from 100% humidity/30 for ASL to almost none/6.5k ASL didn’t effect something.If your rifle is zero'ed at 100y on a verified range, measured or lasered in FL, and in CO the same measured and lasered 100y. Then I would ask is it the same shooting position, same mirage (shimmer) the experts have shown the ballistics don't change. Change from prone to bench, vice versa, technique change due to training?
Cool, I thought someone ran the numbers and said it was negligible, or maybe frank talked about it on the podcast.It was only an inch off, slightly right and slightly lower. While the things you mentioned certainly apply, I’d be very surprised if going from 100% humidity/30 for ASL to almost none/6.5k ASL didn’t effect something.
I’ll mess with JBM when I have more time and run the numbers for both areas atmospheres.
It was only an inch off, slightly right and slightly lower. While the things you mentioned certainly apply, I’d be very surprised if going from 100% humidity/30 for ASL to almost none/6.5k ASL didn’t effect something.
I’ll mess with JBM when I have more time and run the numbers for both areas atmospheres.
Confirmation of zero is the 1st thing you should do every time you shoot.
Takes 5 minutes and lets you know everything is right with the world.
However this isn’t always possible. In a hunting or tactical scenario, you don’t have this option.
The point of the thread though is asking about zero change due to location/environmental. In which case, the answer is no, it doesn’t affect zero.
If the zero changes from the last time you shot the rifle, it’s either the shooter or something mechanical. Either way, it should be addressed as such and not written off as location/environment.
I agree but I am not OAF and neither is the OP so my remark pertains to that part of the community. It is foolish not to check your zero for the reasons you state. Transportation shock can radically f up the situation. That was my point
Again, zero to do with the topic at hand.
(Also, didn’t know it’s OAF to be on a hunting trip for a couple days or more and not checking your zero before you take a shot)
1/2 that students that show up to class don't even have their turrets reset to 0 - 0 and wouldn't know what an actual zero is prior.
"he gives them 15 shots to establish a 100 yards zero".
I appreciate the info Frank. At the same time, this is a forum and I’m sharing my experience without any claim that’s its fact or written in stone.... just what I’ve experienced.It' s time,
The conditions don't have TIME to effect a 100 yard zero. I live in CO and travel just about every other week to other locations and I don't have to re-zero elevation,
You need TIME for the atmospheric changes to have an effect and at 100 yards there is no enough time to cause that issue.
My dope at distance is different, but my zero is not.
Humidity has ZERO effect on this, in fact, 100% humidity is better at 1000 yards the difference between 100% humidity and 0% is barely 4/10th of an inch. That is not 4/10th times 10, it's just 4/10th, so how are you are seeing it at 100?
Here is the clue, you have no clue and are guessing, "I would be surprised" ... telling