Having some vertical stringing problems when its cold out. Same load everytime, etc, when it was -6 there was very little stringing, when it was -28 the most, and Sunday I shot betwwen the two, it was -19. Is this more to do with powder or primers? Or just coinsidence? Some forums say move to a magnum primer. I'm using varget and federal 210's in my 308.
Cold weather = mag primer?
- Thread starter gillamboy
- Start date
I've worked up a load with Fed 215 primers and Varget for cold weather with my 308 and I see no vertical stringing. I do see a difference in POI between the first group with rounds straight out of the truck and rounds that have sat in the cold. Ammo now goes in the back of the truck.
- Location
- Vancouver Island BC
I am gradually switching over from IMR to Hodgdon powder because H powder is less temp sensitive.The H stuff groups better but the IMR is probably a bit faster,I prefer accuracy to speed.
Absolutely. New component = new work up. Just wondering if the hotter primer would help improve consistency when its cold out.
You will have to shoot your loads over a chronograph to see if the vertical stringing is caused by extreme velocity variations or due to bedding problems.
If you are getting velocity fluctuations of more than 60-70+ fps second between high and low then maybe a hotter primer may help. If velocity swing is 20 -30 fps than I would guess that bedding is the culprit.
