Zeke-BE Report post Posted January 3, 2017 Triangular groups lead me to believe you need to mess with COAL. Huh interesting!! I need to read up on that more. I was also told to use magnums primers instead of my 210m. My groups went from 1" to 2". Switch backed to 210m federals and it tighten back up. I don't know if it will work out for me in the long run. I've had my best success with 210m with H1000 in the 300 win myself. Warm or cold temps. I'm going to try it again and use a magnum primer. I was shooting it and pressure spiked and my bullet was shooting 3100 fps. I droped it from 78.7- 78 and Im still over 3,000 but with a slight creator on the primer. My Coal is were its at and the gun likes it. Im going to drop it another 0.5 grain and see if my velocity drops and reduce these creators. But still shooting 1" MOA. Maybe when I tried that magnum it was a fluke so we will test the magnum up to the 210m again. Share this post Link to post Share on other sites
firstcoueswas80 Report post Posted January 3, 2017 Thanks for all the insights and tips! I have a box of the Hornady 200gr ELD-X to try but haven't had a chance to mess with them yet. Rifle is a Weatherby Mark V, 1:9.5 twist, has a long throat and magazine length really restricts the length, has aluminum bedding block but is not glass bedded, trigger is adjusted as low as it will go assuming about 3lbs, shooting table has been folding style with bags or bipod. I can't remember but a 1:9.5 should stable that bullet. Any heavier you probably want a 1:10 barrel. I could be wrong One would want a faster twist, not a slower twists to stabilize a longer heavier bullet. Share this post Link to post Share on other sites
Zeke-BE Report post Posted January 3, 2017 Thanks for all the insights and tips! I have a box of the Hornady 200gr ELD-X to try but haven't had a chance to mess with them yet. Rifle is a Weatherby Mark V, 1:9.5 twist, has a long throat and magazine length really restricts the length, has aluminum bedding block but is not glass bedded, trigger is adjusted as low as it will go assuming about 3lbs, shooting table has been folding style with bags or bipod. I can't remember but a 1:9.5 should stable that bullet. Any heavier you probably want a 1:10 barrel. I could be wrong One would want a faster twist, not a slower twists to stabilize a longer heavier bullet. Ha ha ha yes!! Brain fart. Thanks for pointing that out Share this post Link to post Share on other sites
