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I wish I could get a hold of one of those oehlers
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You might be in luck. Over at benchrest.com, there was a thread started the other day about chronographs and two guys were looking to sell theirs because they did not like them for whatever reason. Might be worth a try.....
Usually, when I hear guys say they have a bad Oehler it is not really bad, it is just that they have it set up wrong. The screens have got to be EXACTLY 2 feet apart if setting them up on a 4' rod. 1/16" off and they will throw a fit. The unit also has to be first "switched" to what length of rod you are using before you turn it on for the first time. The screens also have to be level on the rod. If they are twisted at all, the unit will not give accurate readings.