Large rifle VS Larger Rifle Magnum

[r bose]

Winchester just makes one large rifle primer. Since Winchester Olin used a lot of ball powders they designed a large rifle primer that ignited the ball powders reliably. I think it may matter what part of the country you are in. I noticed several years ago that the 1000yd shooters out west used a lot of magnum primers. Myself and many others here in the southeast used non magnum for the 300 Ackley. I tested many primers and the non magnum Fed GMM gave me the best results for primers readily available. RWS and the old Russian Primers were "cold" compared to most. They could deliver some amazingly low SD. Testing is the answer. Whatever works I do not question.

I own both Winchester LR primers AND Winchester LR MAG primers. Both do exist.

 

[r bose]

Thanks for that!
I had picked up a brick of the 250’s during this shortage and was hoping I could use them for my WLR primer load in 6.5 Creedmoor.

Can't imagine you'd have an issue but as always, reduce load and work back up

 

[victormendoza5781]

Just this week I tried Fed210 primers instead of Fed215 with 85 gr. of H1000 and the Fed210 were 25 fps slower and the 5 shot group was terrible.

Now try some powder you haven’t tested, for example. N565 and load a mid charge for your desired caliber, do 6 rounds with Fed 210’s and 6 with Fed 215’s. In your example, you took a load you had already worked with using the 215’s and you expected the 210’w to magically do better in every aspect except for maybe speeds. I never hunt in weather colder than 20 degrees, so I only use Large Rifle Primers in all my guns. 300 PRC, 28 Nosler, 7 PRC, 7 Rem Mag, 6.5 PRC, 6.5-300 wby mag, 26 nosler, 6.5-284 norma etc

 

[BigBolt]

My experience between LRPs and LMRPs all has to do with handloading the S&W .500 Magnum cartridge. Several powders call for LRPs and many others do not and call for LMRPs. I have used the LRPs where it was called for LMRPs and where LMRPs are called for I used the LRPs. The differences in Chrono were very minor and really did not have an overall factor in accuracy. What it did discover in subzero weather the LMRPs performed much better than LRPs, and the powder burned much cleaner.

 

[Kracken McGraw]

s. I have used the LRPs where it was called for LMRPs and where LMRPs are called for I used the LRPs

Isn’t this the same thing?

 

[CJ6]

I tried to find a long-ago post of primers being shot off in the dark to show the size of the "flame". Couldn't find it but, then again, my computer skills are always suspect.

German Salazar did some pictures some time ago. These were posted a week or two ago on another primer thread here

 

[Ledd Slinger]

Just my opinion.... when a rifle charge is about 60 grains or more, use a Magnum Primer.

The 60 grain rule is what I’ve always followed. However, I believe it only applies when shooting in temperatures around or below freezing. If a person is shooting in 40 degrees and and warmer temps, then they should be fine using a standard LRP to ignite larger magnum charges

Now being that I live in Montana and all my big magnums are hunting rifles, I only test and load Magnum primers in them. Period.

 

[wboggs]

I’m actually having great results with 95+ grains of N570 with a standard fed FGMM primer, a better ES than the magnum.
If I was running a ball powder in cold weather I’d 100% go with a magnum

Federal designed its magnum LR primer to solve issues with ball powder in 300/378 weatherby.

Fes 215 m primers were around long before the 300-378
I was using them in the 60's. Could have been designed for the .378/.460 wby.
Actually, reg 210 m work well in a 300 prc and h1000.
Ball powder and cold temps could be another use.

 

[bozo699]

I tried to find a long-ago post of primers being shot off in the dark to show the size of the "flame". Couldn't find it but, then again, my computer skills are always suspect.

I remember that and may have it saved somewhere but might have been on Al’s varmint page?…
Wayne

 

[Texas Solo]

I went from std LR primers to magnums in my 308. Middle of the road powder charge. Velocity picked up 75fps with same powder chg.

 

[358WCF]

These?


WLR


Rem 9 1/2


210M


BR2


RWS

 

[Mike TackleBerry]

These?

View attachment 1565360
WLR

View attachment 1565361
Rem 9 1/2

View attachment 1565362
210M

View attachment 1565363
BR2

View attachment 1565366
RWS

Fed 210M seems to have the most complete burn of all of them.

 

[Diverjeff]

Magnum Primers? - YouTube

 

[MGYSGT]

I only use Mag primers. Why clutter up the bench.

 

[Kracken McGraw]

I only use Mag primers. Why clutter up the bench.

Are you talking about Large primers? This might be helpful if someone was learning from this on a google search.

 

[Murray Brook]

Fes 215 m primers were around long before the 300-378
I was using them in the 60's. Could have been designed for the .378/.460 wby.
Actually, reg 210 m work well in a 300 prc and h1000.
Ball powder and cold temps could be another use.

From what I have read is that Roy Weatherby commissioned Federal to develop him a primer for his 378 Weatherby because at the time he was having ignition problems with the primers of the day in such a large case. This became known as the Fed 215.

 

[wboggs]

That is the story I read in the Weatherby literature of the 60's when they published reloading data. They were used in the Wby cals of the day. They used either Hornady and Nosler bullets Norma brass, and gave loads for IMR 4350, Hodgdon 4831, and Norma 205. My favorite for my 26" barreled .300 was the N205 which gave the best velocity and pressure (pressure tested by Norma). It was a hell of a load and could hold it own today.

From what I have read is that Roy Weatherby commissioned Federal to develop him a primer for his 378 Weatherby because at the time he was having ignition pro

From what I have read is that Roy Weatherby commissioned Federal to develop him a primer for his 378 Weatherby because at the time he was having ignition problems with the primers of the day in such a large case. This became known as the Fed 215.

blems with the primers of the day in such a large case. This became known as the Fed 215.

 

[4xforfun]

I remember an article in the old Precision Shooting Mag about this same topic with lots of pictures.