Jak26 Posted September 26, 2021 Report Share Posted September 26, 2021 Hi guys, I've just purchased a few boxes of HORNADY VARMINT EXPRESS, .22-250 REMINGTON, V-MAX, 55 GRAIN (8337) to try out. Just inputting data into StrelokPro now and its asking for relevant data. I've selected the chosen bullet but its contradicting the information provided on the Hornady datasheet. Could someone please enlighten me on the values to input for the said bullet? Bullet length (mm): Bullet diameter (mm): Bullet weight (grains): 55gr Ballistic coefficient? Also what drag function is best to use? G1? Cheers Quote Link to comment Share on other sites More sharing options...
silver fox 1 Posted September 27, 2021 Report Share Posted September 27, 2021 (edited) On 26/09/2021 at 15:00, Jak26 said: Hi guys, I've just purchased a few boxes of HORNADY VARMINT EXPRESS, .22-250 REMINGTON, V-MAX, 55 GRAIN (8337) to try out. Just inputting data into StrelokPro now and its asking for relevant data. I've selected the chosen bullet but its contradicting the information provided on the Hornady datasheet. Could someone please enlighten me on the values to input for the said bullet? Bullet length (mm): Bullet diameter (mm): Bullet weight (grains): 55gr Ballistic coefficient? Also what drag function is best to use? G1? Cheers Hi the bullet coefficient is 0.255 For the 55gr vmax Bullet diameter .224 5.68mm I probably would use G1 not sure what what you mean by Length is that cartridge overall lenght or bullet Head length ? Edited September 27, 2021 by silver fox 1 Quote Link to comment Share on other sites More sharing options...
Jak26 Posted September 27, 2021 Author Report Share Posted September 27, 2021 3 hours ago, silver fox 1 said: Hi the bullet coefficient is 0.255 For the 55gr vmax Bullet diameter .224 5.68mm I probably would use G1 not sure what what you mean by Length is that cartridge overall lenght or bullet Head length ? Thank you for your reply, I believe length to be the bullet head length it’s self. The suggested bullet length from the app is 20.60mm. Do you use strelokPro yourself? Cheers Quote Link to comment Share on other sites More sharing options...
silver fox 1 Posted September 28, 2021 Report Share Posted September 28, 2021 (edited) No i use iStrelok but not the pro version. The version I have doesn’t ask for bullet length I’ve just measured a 55gr vmax @ 20.76 The bullet length will vary because of the plastic tip and manufacturing and you probably will need to take the coefficient with a pinch of salt as well because a lot of manufacturers tend to stretch the truth a bit but it’s a good place to start Edited September 28, 2021 by silver fox 1 Quote Link to comment Share on other sites More sharing options...
Jak26 Posted September 29, 2021 Author Report Share Posted September 29, 2021 Ah brilliant, thank you for your help! Using the coefficient for longer distances, what would you suggest if I’m not getting somewhat near the results expected from the app? Quote Link to comment Share on other sites More sharing options...
silver fox 1 Posted September 29, 2021 Report Share Posted September 29, 2021 You should be somewhere it near, just to find tune it I probably use velocity it’s probably not worth altering your coefficient until you get out past 500 yards maybe Quote Link to comment Share on other sites More sharing options...
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