adam204 Posted July 25, 2009 Report Share Posted July 25, 2009 Hi all. I'm going to be re loading soon for the new rifle thats imminent and I wanted to know if any one has accurate ballistic co efficients for 39 grain sierra blitz kings, 40 and 32 grain v max, all in .204 ruger? I'm asking as I have read in various articles that the bc's of bullets seldom match what the manufacturers state. If not what do you do for producing accurate long range drop and wind charts? I will be using sierra infinity 5 ballistic program. Many thanks in advance Adam Link to comment Share on other sites More sharing options...
1967spud Posted July 25, 2009 Report Share Posted July 25, 2009 39g blitz kings are .287 40g v-max are .275 32g v-max are .210 these figures are according to exbal which isnt usually far out Link to comment Share on other sites More sharing options...
Guest varmartin Posted July 25, 2009 Report Share Posted July 25, 2009 Hi Adam.... First off..plumb in all the data as accurately as you can.. IE, scope height velocity from a known good crono , add an extra 5-10 fps as you wont be measuring it at the muzzle but ( approx 6 feet away ) published BC...to start with... Your zero..200yards. Then go to your chosen safe spot and set out target boards at 300, 400, 500 600 yards and compare this real world drop data with your print out, and if things are not quite right ...then `fudge` the BC ...IE change it ..up or down until your reading come into alignment ... Link to comment Share on other sites More sharing options...
foxwhistler Posted July 25, 2009 Report Share Posted July 25, 2009 According to sierra, these are the BC`s for the 39gr. .287 at 3600 fps and above .270 between 3600 and 3400 fps .255 between 3400 and 2800 fps .236 between 2800 and 2300 fps .210 between 2300 and 1900 fps Link to comment Share on other sites More sharing options...
adam204 Posted July 26, 2009 Author Report Share Posted July 26, 2009 Thankyou for the replys. I will try to set out targets at my intended ranges although it will be difficult due to the terrain where I live! And the inclement welsh weather of course!! Link to comment Share on other sites More sharing options...
(200x135).jpg.0fd0a94f065c6cb243fdff1b40e0819a.jpg)
.jpg.0972b4e2bdf0b5a4109eb96f2b1b62ad.jpg)
Recommended Posts
Archived
This topic is now archived and is closed to further replies.