Magnum primer question

[Muddyboots]

This chart still has good reference.
Post in thread 'Magnum primer vs. Standard???'
https://www.longrangehunting.com/threads/magnum-primer-vs-standard.352233/post-3030498

 

[Dragoon300]

Acceptable ignition and consistency are necessary for accuracy. Uniform flasholes are necessary for Consistency, some brass is manufactured with more attention to detail and Consistency.
A side note, CCI is a trusted brand of 22 rimfire ammo, which demonstrates their ability to maint high levels of consistency.

 

[Muddyboots]

Primer flame "size".

Primer Flash Test Photos

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[Mark37082]

I find myself protecting my stash of GM215M primers like they are precious stones. Like other items that become scarce, I believe this is irrational. I currently don't shoot powder hog cartridges with extremely slow powders, but you never know when a great deal on a big magnum will come along. The last few bricks I have purchased were CCI BR-2 primers. I bought them because I found them locally and my 210's were getting low. I worked up loads and quite frankly cannot tell the difference between the other primers I was using.

 

[Muddyboots]

^^^+1 !!!
I understand the component dilemma we all face at this time and it is not going to get any better and in fact lot worse. I am convinced this administration is targeting every aspect of civilian ammunition.

Try a different primer. Nothing to lose period. No different than trying a different powder. If they don't work to your satisfaction, use them for fire forming.

I tried Rem 9 1/2 Mag in a .270 Win load and got best accuracy, ES SD for this bullet. It's now my go to for this rifle. I use 9 1/2 LR in .243 and zero difference. In fact shot my longest kill on chuck last week at 512yds.

We are in a time of serious change in our sport. Change can be difficult or it can be a great learning experience. Those that embrace change prosper no matter what the subject matter or circumstances.

 

[asd9055]

Just a thought, but would the powder you choose, not just the volume have something to do with primer performance? I used to load 79 grn IMR4350 with Rem 9 1/2 standard and never had a failure. (caution, that load is deemed UNSAFE according to Hodgdon and modern laoding manulas). I don't believe when the IMR4350 was made they had Magnum Primers. Again, just a thought.

 

[terry 338rum]

i shoot a 338 RUM with 93.8g of h1000 and fed 210m with no problem

 

[memtb]

Like other items that become scarce, I believe this is irrational

I don't think that it's irrational……just darn smart! memtb

 

[MagnumManiac]

I also shoot my 300RUM with standard primers, either Fed210M or WLR.
Primer brisance, powder packing scheme and powder type, being extruded or ball is my guide. I have never taken that BS about 60+g of powder needing a magnum primer as gospel…

Cheers.

 

[VinceMule]

We have reloaded at the rifle range for 30 years. One thing for sure, you do not know what primer will be best for a particular load till you try it....humbling to say the least.

Tula primers run large
Win can run small

With a good micrometer, best to measure the dia of your primers. As hot loads are ran in cases, pockets open. where you can use a larger dia primer if the load will allow this.

I use double quality control on the size of primer pockets:
I de prime with a hand tool
I prime with a hand primer

I toss brass quickly on an easy primer seat because I detest a bolt face that has been flame cut.

 

[rjgonzo]

As long as you are not hunting or shooting in sub-zero conditions, I would try some normal large rifle primers. I exclusively use WLR primers in all my cartridges from 30-06 to 7mm RUM with no issues.

Why not in sub-zero? I've never heard that before.

 

[JakeWes]

Why not in sub-zero? I've never heard that before.

Because where I live and hunt it does not get that cold, and if it does I am not shooting lol. Realistically, where I hunt in the Adirondacks, the coldest it gets during the antler season is around ~20F. I've had no problem shooting my STW or Rum with 100+ grains of WC872 or WC860 with normal winchester large rifle primers in the winter.

 

[memtb]

Why not in sub-zero? I've never heard that before.

Insurance! You may never need it……but you will wish you had it when bad things happen! memtb

 

[WapitiBob]

We have reloaded at the rifle range for 30 years. One thing for sure, you do not know what primer will be best for a particular load till you try it....humbling to say the least.

Tula primers run large
Win can run small

With a good micrometer, best to measure the dia of your primers. As hot loads are ran in cases, pockets open. where you can use a larger dia primer if the load will allow this.

I use double quality control on the size of primer pockets:
I de prime with a hand tool
I prime with a hand primer

I toss brass quickly on an easy primer seat because I detest a bolt face that has been flame cut.

I sold all my Winchester LRM primers a few years ago because they were on the small side.