Magnum primers in 6.5 Creedmoor (Fine, OK, or Bad) ???

rustyinbend

rustyinbend

GySgt USMC 1976-1992
Full Member
Minuteman
Dec 9, 2018
3,260
3,606
Bend, Oregon
#1
All I have left are a bunch of Large Rifle Magnum Primers I use for 300 Win Mag ... and I wanted to reload 6.5 Creedmoor. I know non-magnum is better, but does anyone have experience with this and can advise me as to whether using magnum primers in 6.5 Creedmoor is (a) fine, (b) OK but not great, or (c) a terrible idea. Thanks!
 
#3
I've used them in similar sized cartridges. I'd back off a little and rework the ld. In theory they shouldn't be as accurate, but that may not be the case.
 
#5
Thanks guys ... that's helpful. Looks like the answer is somewhere in between (a) and (b).
I'm hoping the availability nightmare for reloading supplies ends someday soon. But I'm not optimistic.
 
#6
Magnum primers in the 6mm Creedmore with H4350. I only use magnum LR primers. 22-250, 6 and 6.5 creed, 308, 300wm and 280. The only powders I have ever had trouble getting good SDs with are ball powders like WC844 and 4000MR.

WC844 was in the 223 so tLR primers. I guess I did shoot s little of it with 110s in the 308, but I was going for prairie dog super flopper, not LR blaster.
 
#11
Great, I appreciate the feedback. Have you used them with ball powers like supercorndogs mentioned above? I'm new to shooting and with powder shortage I just purchase some powders that work with 6.5 to start learning with until some H4350 or comparable powers become available. I'm using H414 to burn it up practicing since it's been discontinued with a mid range load of 42.5 gr. With it being a ball power I'm curious if you had the same issue with SD.
 
#12
Absolutely fine to do. I worked up a ladder using both side by side. The magnum primers saw an appropriate 50fps increase over standard for comparable charge weight. However I can’t comment on extreme spread. I’m sure hunter in extreme cold temperatures use them as standard anyway.

Don’t think you would have an issue using them, but if you were near the top end charge I would come down a bit… but in reality I would work up your load again full stop as I’m assuming your accuracy node would shift changing the recipe / primer.
 
#13
You are in a state that isn't that cold in the winter, but some guys swiich to magnum primers with ball powders when it gets cold. Ball powders take a hotter spark to ignite in cold weather.
 
#14
I use them. You will have no issues and not worth looking to trade out.

I do see a velocity increase compared to a non magnum. The highest was 60fps using varget under a 130.

Accuracy was spot on.

Run em
 
#16
Sounds like you'll be going through the whole developmental thing anyways with new powder so the Magnum Primers will fit right in nicely.
It will be a seamless transition.

Might as well throw in some new brass and have a load that will last you awhile.

Win win for you!
 
#17
Depending on the powder used, I use both magnum and standard primers in both my .25-06 and 35 Whelen. If magnum primers are what you have, drop down to the starting load for your powder/bullet combination and work up. You should have higher pressures than with a standard primer. However, if you start at the bottom and go up, you should find a good pressure/accuracy limit.

If that is what you have to shoot, it will work, however, as always be careful. Those last few FPS are not nearly as important as the barrel steel between you and 65,000 PSI propelled shrapnel.
 
#18
I actually prefer the magnum primers in my creeds if your at the top of a powder charge it could matter but I’m plenty safe at 41.5 for the 6.5 and 40.3 in the 6mm. You should get a little more velocity with the mags
 
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