Primer! (Read 239 times)

justin1098

Primer!
« on: January 09, 2019, 11:29:56 AM »
Is there any reason why you shouldn't use magnum primers?

I have been reloading rifle cartridges for a few years. I have used both small rifle and small rifle magnum primers in 223, 6mmbr, 30 carbine, and 300BLK. I have been using large rifle primers for .308 and 30-06 using "stick" powders like varget and 4895 and so on. I recent loaded up some 308 using w748 which is a ball powder. I had some minor hang fires. maybe 6 out of 50 rounds hade a quick delay.
The internets say you gotta use magnum primers with ball powder. I can confirm this to be true in larger cartridges.

So there are some circumstances when you need magnum primers. Is there circumstances when you have to use non magnum primers?

Heavies

Re: Primer!
« Reply #1 on: January 10, 2019, 08:45:10 PM »
For SD numbers, with large primers, I've experienced better performance with 'softer' primers (cups and fire) such as Wolf or PMC large rifle primers.  Very good standard deviations in velocity...  Magnum primers have 'harder' fire and cups that can be beneficial igniting harder to start powders or running in semiautos with floating firing pins, and can help deter slamfires.

I use regular primers with large rifle primer cartridges, and use magnum or military primers in semiautos.  Small rifle primers I use CCI 450s exclusively, just because I got a deal on a million of them, and they work great.

Main thing is work up the load with that given primer and don't switch unless you work back up.

justin1098

Re: Primer!
« Reply #2 on: January 10, 2019, 09:34:47 PM »
Thanks.
Naturally I work up a load with the chosen primer. I just wanted to make sure there isn't any circumstance where I shouldn't use LRM primers.   I think you told me what I needed to know. All my larger rifles are military PTR91, FAL, M1 Garand.

I plan to get a precision 308 rifle but I think I may use Lapua palma brass. If the primer pockets stay tight like the 6mmbr brass, the value would be hard to beat.

once again, thank you Heavies

Heavies

Re: Primer!
« Reply #3 on: January 11, 2019, 08:52:11 AM »
Thanks.
Naturally I work up a load with the chosen primer. I just wanted to make sure there isn't any circumstance where I shouldn't use LRM primers.   I think you told me what I needed to know. All my larger rifles are military PTR91, FAL, M1 Garand.

I plan to get a precision 308 rifle but I think I may use Lapua palma brass. If the primer pockets stay tight like the 6mmbr brass, the value would be hard to beat.

once again, thank you Heavies
:thumbsup: :thumbsup:

+1 on Lapua palma brass!  Been using those for a long time with CCI450s. They can take a lot.  Tight primer pockets on hot loads, in match chamber, with over 10x reloaded. Just need to anneal necks for long long life.


I found, however, I needed to ream out the flash hole for reliable ignition with 8208xbr.  Other powders may not need. Didnt affect SD numbers or accuracy by doing that. 


Another note, you 'll have to file down decapping pin diameter if you leave the palma flash hole laupa factory size.  Can't remeber if 6BR brass was the same way ...   :thumbsup: :shaka:

justin1098

Re: Primer!
« Reply #4 on: January 11, 2019, 05:30:01 PM »
Thanks for the advise. Lapua 6br does infact have the small flash hole and I have a few of the special decapping pins. I believe that Redding dies came with both.

Bushido

Re: Primer!
« Reply #5 on: January 11, 2019, 08:35:43 PM »
For SD numbers, with large primers, I've experienced better performance with 'softer' primers (cups and fire) such as Wolf or PMC large rifle primers.  Very good standard deviations in velocity...  Magnum primers have 'harder' fire and cups that can be beneficial igniting harder to start powders or running in semiautos with floating firing pins, and can help deter slamfires.

I use regular primers with large rifle primer cartridges, and use magnum or military primers in semiautos.  Small rifle primers I use CCI 450s exclusively, just because I got a deal on a million of them, and they work great.

Main thing is work up the load with that given primer and don't switch unless you work back up.

Interesting. I haven't had good luck with softer SRP like 400s. They heavily flatten and crater with the lighter loads. I use BR4s pretty much exclusively for my precision stuff. I use 400s and 41s for my carbine stuff. I did have 1 slamfire with a 400 but that is like several thousands of rounds of 400s. I can live with that.

You look look at SDs over ESs? I usually look at ES over at least a 10 shot string as a 8 is not acceptable for me.

justin1098

Re: Primer!
« Reply #6 on: January 11, 2019, 10:53:49 PM »
Interesting. I haven't had good luck with softer SRP like 400s. They heavily flatten and crater with the lighter loads. I use BR4s pretty much exclusively for my precision stuff. I use 400s and 41s for my carbine stuff. I did have 1 slamfire with a 400 but that is like several thousands of rounds of 400s. I can live with that.

You look look at SDs over ESs? I usually look at ES over at least a 10 shot string as a 8 is not acceptable for me.

You should try cci450s I've had better consistency with 450s over br4s and 400s. They have a thicker cup than 400s and are cheaper than br4s and 41s too.

Heavies

Re: Primer!
« Reply #7 on: January 12, 2019, 12:48:18 AM »
Interesting. I haven't had good luck with softer SRP like 400s. They heavily flatten and crater with the lighter loads. I use BR4s pretty much exclusively for my precision stuff. I use 400s and 41s for my carbine stuff. I did have 1 slamfire with a 400 but that is like several thousands of rounds of 400s. I can live with that.

You look look at SDs over ESs? I usually look at ES over at least a 10 shot string as a 8 is not acceptable for me.

Better to look at SD, statistically its the average of velocity dispersion across all rounds. The more shots in the series the better.  Still I dont discount ES, that could indicate problems in loading process or some other issue.  Single digits in both indicate a real good load. 

Velocity issues dont matter at 100 yards,  out to range it matters.   







You should try cci450s I've had better consistency with 450s over br4s and 400s. They have a thicker cup than 400s and are cheaper than br4s and 41s too.


+1