Primers: Std. vs. Magnum

L.Sherm

Well-Known Member
LRH Team Member
Joined
Jul 26, 2017
Messages
2,851
If I remember correctly Remington recommends only using the 6.5 in hornet style cases.
 

milo-2

Well-Known Member
Joined
May 1, 2011
Messages
1,045
Location
Gillette, Wy
I got my 6.5x47 in early 2016 and it was a 9 month wait for the rifle so I read all the stuff I possibly could on line about reloading for it. A guy from TBAC had done a lot of testing and recommended the CCI 450, so I bought 1,000 of them and I’m down to about 500. Im sure the 205s are good too but I was just totally infatuated with the “magnum” status of my new primers! What a Mall Ninja, huh?
Mall Ninja, good stuff! If what you have works. stay the coarse.
I did a CCI 450-205M test on Dasher cases, I was loading for 4 of them, 3-1 in favor of 450. One 450 - Varget load lost some zest, tested both, numbers way better with 450, groups better with 205M, tough choice. I have a 6 BRA barrel done, I may dedicate a 205 mated with Varget and roll the dice.
 

Scott E Ames

Well-Known Member
LRH Team Member
Joined
Dec 25, 2012
Messages
283
FYI From the mistakes that turned out well column. I grabbed a box of 205 match primers instead of my usual CCI 450's for my RL 23 6.5 CM loads with 140 bergers. I didn't find the error until 15 rounds were loaded so out of laziness I thought I would try them and hope for no problems. I found that I got an extra 35 fps and SD of 4 and ES of 9 and my 200 yards groups were 0.24 MOA. (all improvements over the 450's) I have also read about ball and slower powders needing a magnum primer in the small primer Creedmoor case but in some situations this isn't the case. If it was below zero in December there might be different outcome???
 

milo-2

Well-Known Member
Joined
May 1, 2011
Messages
1,045
Location
Gillette, Wy
FYI From the mistakes that turned out well column. I grabbed a box of 205 match primers instead of my usual CCI 450's for my RL 23 6.5 CM loads with 140 bergers. I didn't find the error until 15 rounds were loaded so out of laziness I thought I would try them and hope for no problems. I found that I got an extra 35 fps and SD of 4 and ES of 9 and my 200 yards groups were 0.24 MOA. (all improvements over the 450's) I have also read about ball and slower powders needing a magnum primer in the small primer Creedmoor case but in some situations this isn't the case. If it was below zero in December there might be different outcome???
If it is below zero I will be inside doing things, so no clue there.
Yours is a classic example of getting a more consistent burn w/o the magnum primer. 2 big factors when discussing small rifle primers in the creed case, large or small flashole. I can see the non magnum doing better in small flasholes. I tried CCI 450's in a 6 creed, Lapua brass, with Norma MRP, erratic numbers and the majority were hangfires.
 

Mikecr

Well-Known Member
Joined
Aug 10, 2003
Messages
5,307
Location
NC, oceanfront
I want the least powerful primer that tests best with my powder/capacity. With this, I also begin with thinnest cup standard primers, because I also want the least striking force that reliably fires primers.
But ultimately, only TESTING leads to best primer for your system.
 
Last edited:

L.Sherm

Well-Known Member
LRH Team Member
Joined
Jul 26, 2017
Messages
2,851
Out of the big 3 ( federal, Rem and CCI ) CCI is the only one that claims "magnum"
 

243winxb

Well-Known Member
Joined
Sep 9, 2016
Messages
433
Location
USA
Call the manufacturers and ask the question see what they say.
Great idea.
Or work up loads with both 400 & 450. See what primer flows into the firing pin channel first.

Federal primers are the only ones that may contain Nitroglycerin.
 

L.Sherm

Well-Known Member
LRH Team Member
Joined
Jul 26, 2017
Messages
2,851
I was doing load development in a 20 Blitz (20PPCAI) a couple weeks ago and was testing some 450's and 7.5 and the exact same same charge and powder the 7.5 as 20 fps faster.
 

gilkison

Active Member
Joined
Oct 23, 2011
Messages
39
A lot of people say the magnum primers give more consistent velocity but I havent noticed a difference in 223 but I know the 450’s have a thicker cup and re recommended for ar15’s.

I haven’t had a problem with 400’s in my ar’s but I had to switch to 450’s in my 223 bolt gun after I pierced and 400 and broke the sear in my trigger.
 

TRG65

Well-Known Member
Joined
Dec 21, 2017
Messages
278
I reloaded the 6.5x47 for over a decade as my primary match round and I've used CCI 41 in almost all the reloads. I tried the CCI br, (I still have most of the 1k box I got) to see if there was an improvement and it wasn't noticeable, so I went back to cci 41. I've always been able to get SDs in the single digits, and when the SD's creep over 10, it's a sign the barrel's about done. I've run SRP brass in 4 6.5x47s and 1 6.5 Creedmoor. The Rem 700 actions or rem 700 clone (Bergara) had to be sent to Gre-Tan for the firing pin to be bushed. The Sako and the Ruger that I've used did not need bushed for SRPs.
 

lotech

Active Member
Joined
Jan 29, 2013
Messages
26
With regard to .223 loads for ARs, I've found generally, not always, that I get best accuracy with CCI-400s, followed by CCI-450s, and then Remington 7 1/2. The differences are small but enough to notice. However, I normally use the CCI-450s because of the thicker cup, but any of these primers work fine. Best to test them in your gun to be sure.

I'd have to look up chronograph figures, but I don't recall much difference in muzzle velocities with any of the primers.
 

Trending threads

Recent Posts

Top