I own a Umarex Origin and just watched the review by Hajimoto on YouTube. He determined shot curves based on hammer spring settings for the entire fill. Since this is my first PCP I have a couple questions on this. Would I need to establish my own graph on my gun using crony and pellets he used to find the results he determined or would his be close enough as far as hammer settings? Also would the corny results of FPS be the same throughout the fill range from one fill to the next using same pellet type or does it vary somewhat fill to fill? With mine being non-regulated vs regulated wasn't sure if that made any difference.
Tuning Shot Curve Question
- Thread starter jjohnsonlta
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I'd say doing your own for your specific gun would be necessary, although it could be similar. As far as fill to fill in your own gun, that should be consistent.
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As stated above.... Likely might be close to where you want to be on hammer adjustment, but every gun is different. Once set, velocity should be repeatable. Otherwise would indicate a problem, like loose adjuster, or failing seal, ect.
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Most unregulated guns and some regulated ones give different velocity curves and shot counts in different temperatures. Normally less and slower shots in sub 50deg compared to 90plus degrees.
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Thanks for replies. II think I will invest in a corny. That way I will know first hand what the hammer adjustment is doing as far as FPS using different pellet on my rifle. Also with cold weather shooting.
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Hajimoto
Member
I am going to qualify my response with a blanket statement that is very general but necessary. Because of manufacturing differences and tolerances, two exact same model PCP's from the exact same manufacturer may perform differenty. Typically the higher quality PCP's tighten and almost eliminate that gap.
That said, if you have the same model and duplicate the settings I shared in my review, you will certainly produce similar results without any additional purchases.
That said, if you have the same model and duplicate the settings I shared in my review, you will certainly produce similar results without any additional purchases.
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Thanks for your reply Hajimoto.
I ordered one of those 30 buck chronographs to do some testing. Figured that it's ok for the price to give me some readings at different hammer settings/pellet weights. After reading article in Hard Air Magazine I decided it would work well enough for me.
I ordered one of those 30 buck chronographs to do some testing. Figured that it's ok for the price to give me some readings at different hammer settings/pellet weights. After reading article in Hard Air Magazine I decided it would work well enough for me.
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I started some testing the other day. I did a FPS count starting at two full turns out. I then went to three full turns out. Using the same 16 gr. pellets I only had a avg of 36 FPS difference between the two settings. The Umarex manual that comes with the Origin states each turn will produce a 150-200 FPS difference. I need to continue testing but has anyone else with this gun had results like the manual states as far as FPS change?
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I just read on another site of someone else having a small change in FPS similar to my findings so far. I understand that there is a 6 turn adjustment possible in the hammer spring settings. I wonder if the manual should have read that there is a 150-200 FPS change available within the hammer spring settings? I should find the answer with further testing.
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