Primer question

[Yooper003]

With this primer shortage I have a question about using mag. LRP..I have been reloading many years but really never paid attention to the many variables in loading. I am about out of std. LRP but have several hundred mag LRP. Is there any powders or certain loads that anyone would recommend be avoided using these mag primers?I am loading 7-08 308 35 whelen 38-55 & 45/70. Mostly using Red Dot, 5744, & varget. The funny thing is in my 44 mag loads I am using Winchester LPP & they say on the box , for Std. or mag loads.

[VMAX97]

I have read 2+ articles about using magnum primers without any issue. Seen some testing matrices showing only a ~60fps change when using magnum primers. The idea is that magnum primers help ignite some powders better but do not introduce problems with others. Curious what others say and reference though to gather more info

Sent from my SM-N975U using Tapatalk

[Bazoo]

If it were me, I'd save the standard rifle primers for loads using full power charges of rifle powder, and use the magnum primers for reduced loads that are not at a max pressure level already.

[blackthorn]

I would reduce the powder by one or two grains and work up if needed. Unless you are at the maximum load, I have found very little difference between standard and magnum primers, depending on what level of tack driving you aspire to.

[beezapilot]

Since this is a discussion, I'll tender this. I remember reading (and my memory is every bit as old and decrepit as I am) that using Magnum primers should be avoided in smaller cases. Seems that my recollection is that they are higher pressure and can dislodge the bullet before the powder is fully ignited resulting in pressure anomalies. I'm sitting at my desk looking at a brick of LPMP wondering if they will work..... so please, correct me if I'm wrong.

[onelight]

We have compared small mag-primers to small pistol in 9mm loaded with BE-86 under 125 grain cast all loads done on the same press same powder charge the mag primers were 50 to 75fps faster with higher extreme spread fired at an indoor range so temp was constant . These were not maximum loads so both were safe but we did see a difference in these 2 loads.

[USSR]

I'd use the magnum primers for your Varget loads. Drop back a grain or two if you are any where's near a Max load.

Don

[Yooper003]

Any body have any pros or cons on mag LRP in black powder loads like in 38/55?

[dale2242]

beezapilot, I have friend that uses CCI 450s in his 17 Hornet without issues.
His groups are always the ones to beat in my area.

[Texas by God]

I have used Large rifle magnum primers for decades in 22-250 to 45-70 and lots of cartridges in between. I was given 6000 Remington 9-1/2M in the 1970's and I've used them when I was low on standard large rifle primers by reducing the load by a grain of powder. I always use them for ball powders and the slowest burning powders. I also use them in cast loads without incident,
I could be wrong, but I thought I read once that magnum primers work well for blackpowder large bore rifle loads- perhaps it was Mike Venturino's writings.

Sent from my SM-A716U using Tapatalk

[fa38]

Using mag LR primers worked as good as std LR primers with light loads in 06 and 7mm. Just a slight adjustment in charge for both green dot and Win 231.

When I was shooting a 40-65 with 4759 and 410 grain bullets I had to drop a newspaper wad into the case before the powder to avoid what sounded light hang fires shooting both mag and standard primers. The newspaper wads stopped the hang fires.

Also tried Rem 2 1/2 with good results in the 40-65, no hang fires.