I'm from Indiana and I was wondering about this the other day. If I get all set up and know how many clicks on my scope to make accurate shots at different ranges and then go out west to hunt at 9,000 ft elevation or something similar would I have to start all over again? I know that elevation effects how a bullet flies so I'm thinking I'd have to find a place to re-zero my rifle before any shots were fired. Even if I knew how many clicks of adjustment on my scope I would need in Indiana it wouldn't be 100% correct when the altitude changes. Am I right on this? If I go hunting out west I'd need to get to a range first and check everything, or would I be good to go?