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Primers and large Charges

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Unread 09-21-2003, 12:16 PM
Bronze Member
Join Date: Jan 2002
Location: New Mexico
Posts: 67
Primers and large Charges

Shooting 109 grs of 870 in a Lapua mag.....I'm useing CCI BR Primers...Do I need to go with MAG primers?
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Unread 09-21-2003, 05:26 PM
Platinum Member
Join Date: Jun 2007
Location: Wilmington NC
Posts: 4,787
Re: Primers and large Charges

Find out what your gun says! Look at the ES, is it under 10-14. If not, try some 215s or other mag primers and see what the results are.

Every gun is a beast unto its own and you will not know until you try.

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Unread 09-21-2003, 06:11 PM
Platinum Member
Join Date: May 2001
Location: Pennsylvania
Posts: 1,757
Re: Primers and large Charges


With the ball powder yes, I would go with the Federal 215 primer especially since your over 100 grs of powder.

Some people feel you don't need a mag primer till you get to 100 grs of powder or above.
I use a mag primer from 75grs and above in some rifles.

Darryl Cassel
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Unread 09-22-2003, 12:09 AM
Bronze Member
Join Date: Dec 2001
Location: Montana
Posts: 58
Re: Primers and large Charges

I would say the Federal 215 primer would be what you should use...
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Unread 09-25-2003, 01:53 PM
Bronze Member
Join Date: Jul 2003
Location: Bountiful, Utah
Posts: 71
Re: Primers and large Charges

This topic is of interest to me, because I'm working up some loads in my .338 RUM, and the velocity I'd expect just isn't there with WC872. I've put 103 grains of WC872 behind a 225 grain Hornady bullet, lit it off with a CCI 250 primer and I only get 2651 fps! This is in a Remington 26" factory barrel with a vais brake. The 103 grains is getting close to a compressed load. I have to shake it down pretty good to get it to the bottom of the neck.

Using 95 grains of WC852(s) with the same setup I get 3165 fps. No pressure signs with either load. What gives? Any ideas?

Mark in Utah
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Unread 09-26-2003, 09:37 AM
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Join Date: Jul 2001
Posts: 1,459
Re: Primers and large Charges

You are just running a powder with a pressure/burn rate more suitable to your rifle. Ths 872 was simply too slow for your bullet weight and bore length. If you were to switch to 300grMK, you would find the 872 to be a better powder.

That is why we test loads. You never what will be the magic combo. Going to do the same with my Mystic. Been using H4831SC which should be a great powder. However, vel and accuracy are not what it should be. Going to try H4350 to see if I can improve the performance.

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Unread 02-13-2009, 07:36 AM
Junior Member
Join Date: Jan 2007
Location: Southern England UK
Posts: 12
Re: Primers and large Charges

I use Federal Mag primers in all my reloads and they are far from Large loads.
I am talking 40gns of H380 behind a Hornady 87gnHptBt in .243 and 42gns of H4895 behind a Sierra 150 SptBt. in .308.
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