Originally Posted by fisherman983
is it possible for the chrony to read 200+ fps off ? im not doubting you im just trying to figure this thing out as its starting to get frustrating. just curious, if the fps value I used is incorrect then how can I use an incorecct value and have the right click amount at 625yards and have It be so far off at a longer distance.
I did run the numbers again using a fps that was much slower, and the numbers came back really close to what the actual click value should be...i'll shoot a few more and check but when I shot thru the chrony last time I was certain I set it up correctly and did everything right
I'm not exactly sure what the issue is but I plugged your velocity and bullet into Shooter using an altitude of 2500ft and 70 temp and a BC of .488. Not exact, but close. If your velocity was off and the actual was 3150FPS, I get values very close to your actuals;
The difference at 600 yards would be 5 clicks between 3373 and 3150FPS. At 890 yards I get 58.2compared to your actual of 60 clicks. At 1095 I get 88 clicks against your 87. My values using 3373 FPS is within a couple of clicks of your computed
values. I only suspect your velocity of 3373 because the Nosler 264 Ammo which is loaded up to take advantage of the 264WM's capabilities runs at 3100FPS. 3373FPS sounds very high for that bullet in a 264. I'm not saying that this is your issue but I would start there. I have seen chronographs give errors of 200FPS. having seen the similarity between my calculations and your actuals I does lead me to believe your scope is probably OK. IMHO.