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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
CHrono Woes
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<blockquote data-quote="FRANK21" data-source="post: 127128" data-attributes="member: 1989"><p>I am a bit confused with my new PRO Chonograph Digital. It seems to read velocitys approx 100fps slower than my Chrony F-1. (That met an untimely demise) </p><p>Here are a few velocitys that were chronred on the F-1 and the Pro Chrono.</p><p></p><p>308win- 26"bbl, 45.5gr Varget, 175VLD</p><p>F-1= 2750, PC= 2650</p><p></p><p>308win- 26"bbl, 45gr Varget, 175smk</p><p>F1=2725, PC= 2625</p><p></p><p>2-223Rem- 26"bbls, 25.5gr Benchmark, 55gr BK</p><p>F-1= 3350, PC=3250</p><p></p><p>7mmRemMag- 28"bbl, 63gr RL22, 180 VLD</p><p>F-1=2975, PC=2870</p><p></p><p>I never chronoed the load below on the F1.</p><p>300wsm- 29"bbl, 68.5 RL19, 190VLD</p><p>PC= 3000fps</p><p></p><p></p><p>I then tested a friends 308win:</p><p>24" bbl, 45gr varget, 175smk</p><p>PC=2560, I figured it should be 2650-2700.</p><p></p><p>I used the 7mmRemMag and the 308win @ 800yrds 2weeks ago and they both supported ballistic charts that I made with the data from the F-1.</p><p></p><p>Anyone had a problem like this before? </p><p>Which one should I believe? Im guessing the F-1.</p><p>Any help would be greatly appreciated.</p></blockquote><p></p>
[QUOTE="FRANK21, post: 127128, member: 1989"] I am a bit confused with my new PRO Chonograph Digital. It seems to read velocitys approx 100fps slower than my Chrony F-1. (That met an untimely demise) Here are a few velocitys that were chronred on the F-1 and the Pro Chrono. 308win- 26"bbl, 45.5gr Varget, 175VLD F-1= 2750, PC= 2650 308win- 26"bbl, 45gr Varget, 175smk F1=2725, PC= 2625 2-223Rem- 26"bbls, 25.5gr Benchmark, 55gr BK F-1= 3350, PC=3250 7mmRemMag- 28"bbl, 63gr RL22, 180 VLD F-1=2975, PC=2870 I never chronoed the load below on the F1. 300wsm- 29"bbl, 68.5 RL19, 190VLD PC= 3000fps I then tested a friends 308win: 24" bbl, 45gr varget, 175smk PC=2560, I figured it should be 2650-2700. I used the 7mmRemMag and the 308win @ 800yrds 2weeks ago and they both supported ballistic charts that I made with the data from the F-1. Anyone had a problem like this before? Which one should I believe? Im guessing the F-1. Any help would be greatly appreciated. [/QUOTE]
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