45-70 primer help needed

zack coyote · Post by **zack coyote** » Sat Jan 26, 2008 6:09 pm

I'm brand new to reloading the 45-70, and wonder if I got the right primers at the gunshow today. My reloading manual calles for Remington 9 1/2 large rifle primers. What I bought are Remington 9 1/2 M Magnum rifle primers. Are they the same? If not, will they work with out any pressure problems? I'll be loading 405 gr JSP bullets at mild speeds around 1400-1500 fps. I've got 1000 of these primers so I hope I can use them.

Leverdude · Post by **Leverdude** » Sat Jan 26, 2008 6:52 pm

Theyre not the same but I would use them.
Just start over & work back up. I use mag primers in some 45/70 loads.

Buffboy · Post by **Buffboy** » Sat Jan 26, 2008 7:14 pm

In all likelyhood with loads of that speed and range, you won't actually notice a difference. Either will work but it's a good idea to reduce a load 5-10% to account for ANY primer difference in ANY change from data. Only a cronograph and comparing the same load with a non-magnum primer will let you see it.

gary rice · Post by **gary rice** » Sat Jan 26, 2008 7:46 pm

i dont know what powder or charge you are using but you shouldnt have any trouble at 1500 fps loads. i have alot of magnum primers on hand and use them with low velocity loads frequently with slow burning powders like h-4895.

zack coyote wrote:I'm brand new to reloading the 45-70, and wonder if I got the right primers at the gunshow today. My reloading manual calles for Remington 9 1/2 large rifle primers. What I bought are Remington 9 1/2 M Magnum rifle primers. Are they the same? If not, will they work with out any pressure problems? I'll be loading 405 gr JSP bullets at mild speeds around 1400-1500 fps. I've got 1000 of these primers so I hope I can use them.

Tycer · Post by **Tycer** » Sat Jan 26, 2008 9:12 pm

I'm assuming you are using a MODERN 45-70 at those velocities!?

With that assumption, use them. And start with the lower charges and work up.

KirkD · Post by **KirkD** » Sat Jan 26, 2008 9:14 pm

They're not the same, but I've used both in my 45-70's and really do not notice any difference at my moderate velocities. Use them without worries.

zack coyote · Post by **zack coyote** » Sat Jan 26, 2008 9:47 pm

As always you gentlemen have been very helpful and understanding. I will be using IMR-3031. The book calls for 46 gr. so If I start at 41gr and work up slowly, I guess I'll be OK. The gun is a modern Marlin 1895, which is a joy to shoot. Thanks for the help. Zack

GANJIRO · Post by **GANJIRO** » Sat Jan 26, 2008 10:41 pm

The magnum primers are prefered in 45/70 loads using WW748 powder.

45-70 primer help needed

45-70 primer help needed

Re: 45-70 primer help needed