1967spud Posted December 27, 2011 Report Share Posted December 27, 2011 Did an eight shot group today at 200 yards, group ened up at about 1" in size for all 8 shots so that was ok. I used a chronograph at about 6 feet away from muzzle and i got an average speed of 3117 fps and an ES of 28 fps. Now i know the chrono is ok but i didnt expect such high velocities even allowing for the milder weather. Powder wise i was using 58.2 of 4831 sc as ive found like others this bullet and calibre loves. Link to comment Share on other sites More sharing options...
20series Posted December 27, 2011 Report Share Posted December 27, 2011 Spud is your chrono too close?? I seem to remember reading somewhere that 10 feet is ideal as any muzzle blast etc is eliminated. i have a piece of string marked up so i always put the chrono in the same place every time. Alan Link to comment Share on other sites More sharing options...
6mmBR Posted December 27, 2011 Report Share Posted December 27, 2011 Did an eight shot group today at 200 yards, group ened up at about 1" in size for all 8 shots so that was ok. I used a chronograph at about 6 feet away from muzzle and i got an average speed of 3117 fps and an ES of 28 fps. Now i know the chrono is ok but i didnt expect such high velocities even allowing for the milder weather. Powder wise i was using 58.2 of 4831 sc as ive found like others this bullet and calibre loves. As a bench mark my Shehane runs 2930fps with 58 gns H4831SC and a 180 Berger VLD out of 32" barrel with an ES of 10. I would think your velocity is a bit optermistic for that chage weight although at 6 feet your chrono is on the close side. Cheers Dave Link to comment Share on other sites More sharing options...
1967spud Posted December 27, 2011 Author Report Share Posted December 27, 2011 Good idea Alan Yes i agree Dave i am going to ignore these results and re do them Link to comment Share on other sites More sharing options...
6mmBR Posted December 27, 2011 Report Share Posted December 27, 2011 Looks like she's grouping well Mark. My velocity figures were 10 feet from the muzzle, readings were taken over a friends ultra reliable Oehler chrono. Good luck with your endevours. Dave Link to comment Share on other sites More sharing options...
taylor Posted December 27, 2011 Report Share Posted December 27, 2011 i think the crono is reading high ,58- 59 depending on barrel make gives me about 2950-2990fps and a es of 10 or less and groups about a inch at 400yds Link to comment Share on other sites More sharing options...
Predator7mm Posted December 31, 2011 Report Share Posted December 31, 2011 Chrony is too close. I would retest at 10 feet away as per the instructions and take those readings and disregard your findings so far. Link to comment Share on other sites More sharing options...
1967spud Posted December 31, 2011 Author Report Share Posted December 31, 2011 im redoing it at kynoch for winter testing ion the wind tunnel did not go yet so testing in garden Link to comment Share on other sites More sharing options...
1967spud Posted December 31, 2011 Author Report Share Posted December 31, 2011 test-1 - am sat - sunny - 4 thou off the lands - group was not great 3004 fouling 3003 fouling 3016 2999 3020 3013 3020 3016 3016 test 2 -pm sat - cloudy and quite windy - touching the lands - group was back to about inch at 200 yards 3062 fouling 3088 fouling 3098 3106 3103 3099 3094 3089 what i am thinking is double check speeds with another chrono to confirm and vld's dont like to jump in this rifle, seems my throat has moved 4 thou since new with 260 shots on it. will be at kynoch very soon Link to comment Share on other sites More sharing options...
6mmBR Posted December 31, 2011 Report Share Posted December 31, 2011 Mark impressive velocities. I only could get those with Rel 17. No wonder your throat has moved forward 4 thou in 260 shots. I did mine the other day and it has only moved forward 1 thou in 600 rnds? Cheers Dave Link to comment Share on other sites More sharing options...
1967spud Posted December 31, 2011 Author Report Share Posted December 31, 2011 Dave ill be rechecking the velocities next week at the Kynoch testing facilities. Then well know for definate, i dont think my chrono is wrong but it will concur every thing. Foxshooter please ring me and can cowboy ring me as well. Link to comment Share on other sites More sharing options...
6mmBR Posted December 31, 2011 Report Share Posted December 31, 2011 3100 fps is WSM terratory. I could get 3070fps with 57gns of Reloader 17. Perhaps its your gain twist giving extra speed? Are you going to the January Dorset shoot? Have a happy new year Dave Link to comment Share on other sites More sharing options...
1967spud Posted December 31, 2011 Author Report Share Posted December 31, 2011 o yes hopefully Danny will be there as well Link to comment Share on other sites More sharing options...
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