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Large Rifle Magnum Primers #3479918
09/04/21 11:23 PM
09/04/21 11:23 PM
Joined: Aug 2014
Posts: 1,822
Sneads, Florida
fladeerhntr Offline OP
8 point
fladeerhntr  Offline OP
8 point
Joined: Aug 2014
Posts: 1,822
Sneads, Florida
Got a question regarding loading for rifle calibers with a magnum rifle primer that actually call for a large rifle primer. The caliber I'm focused on is my 7mm-08 when using ramshot big game and 140 game kings or 140 pro hunters. I have already loaded some rounds to test but loaded them with large rifle primers not magnum primers but I've read where most people using this bullets/powder combo are using magnum primers instead of large rifle primers and my question is will I really see much difference in accuracy if I use large rifle primers instead of magnum primers.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3479925
09/05/21 06:52 AM
09/05/21 06:52 AM
Joined: Jul 2010
Posts: 225
huntsville, alabama
U
ultratec00 Offline
4 point
ultratec00  Offline
4 point
U
Joined: Jul 2010
Posts: 225
huntsville, alabama
Western load data lists Fed 210 for 7mm-08, includes loads for Ramshot. All my 7mm-08 loads are with standard large rifle primers, including loads with WW748. I'd say roll with the standard non-magnum primers, but you need to verify any/all load data prior to loading.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3479940
09/05/21 07:30 AM
09/05/21 07:30 AM
Joined: Jul 2020
Posts: 8,193
Chelsea
L
Lockjaw Offline
14 point
Lockjaw  Offline
14 point
L
Joined: Jul 2020
Posts: 8,193
Chelsea
My pet load in 7-08 uses a standard primer, but I really can't imagine at woods ranges the type of primer would make much of a difference either way.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3479951
09/05/21 08:01 AM
09/05/21 08:01 AM
Joined: Sep 2012
Posts: 17,927
North AL
A
AU338MAG Online IMG_0051.GIF
Old Mossy Horns
AU338MAG  Online IMG_0051.GIF
Old Mossy Horns
A
Joined: Sep 2012
Posts: 17,927
North AL
Where have you read this?? Sounds dubious to me. No need for a magnum primer in a 7 08, even using Big Game powder. If they are using a LRM primer its probably because they mistakenly believe they need the LRM for consistent ignition of ball powders.

If you do try and LRM primer, make sure you reduce your loads.

Last edited by AU338MAG; 09/05/21 08:02 AM.

Dying ain't much of a living boy...Josey Wales

Molon Labe
Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3479991
09/05/21 08:57 AM
09/05/21 08:57 AM
Joined: Nov 2016
Posts: 982
Hayden AL
J
Jtb51b Offline
6 point
Jtb51b  Offline
6 point
J
Joined: Nov 2016
Posts: 982
Hayden AL
A 7mm-08 is a necked down 308. Case capacity is similar, burn rate is similar. I see no reason for a mag primer. IF you were loading 7mm magnum sized cases and burn rates I could understand it but these are very different animals. I would shoot what I had loaded and go from there, I cant imagine accuracy issues, or ignition failure issues with using a std primer over a mag.

Good luck!
Jason

Re: Large Rifle Magnum Primers [Re: AU338MAG] #3479997
09/05/21 09:05 AM
09/05/21 09:05 AM
Joined: Aug 2014
Posts: 1,822
Sneads, Florida
fladeerhntr Offline OP
8 point
fladeerhntr  Offline OP
8 point
Joined: Aug 2014
Posts: 1,822
Sneads, Florida
Originally Posted by AU338MAG
Where have you read this?? Sounds dubious to me. No need for a magnum primer in a 7 08, even using Big Game powder. If they are using a LRM primer its probably because they mistakenly believe they need the LRM for consistent ignition of ball powders.

If you do try and LRM primer, make sure you reduce your loads.



I have read this several different places people posting what seems to work best for them. I've actually asked them why they do and they tell me that with big game powder it seems to ignite better with the magnum primer than with the large rifle primer due to the type powder it is. At realistic hunting situations tho they did tell me that I probably would never see any change in accuracy or performance. Another reason I would prefer to use the large primers is because I've got quite a bit more large rifle primers vs magnum primers which I'd like to save for my 7 mag.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3480005
09/05/21 09:18 AM
09/05/21 09:18 AM
Joined: Mar 2013
Posts: 14,562
Tuscaloosa Co.
N
N2TRKYS Offline
Booner
N2TRKYS  Offline
Booner
N
Joined: Mar 2013
Posts: 14,562
Tuscaloosa Co.
I use a magnum primer in my BG 7-08 loads. I never tried LR primers in it.

I’ve used magnum primers in other cartridges where a LR primer was called for. I’ve never reduced my charge weight and have never had any issues with doing so.


83% of all statistics are made up.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3480066
09/05/21 10:48 AM
09/05/21 10:48 AM
Joined: Jan 2003
Posts: 12,651
behind my Dillon
dave260rem! Offline
Skinny’s Ex
dave260rem!  Offline
Skinny’s Ex
Joined: Jan 2003
Posts: 12,651
behind my Dillon
I see no reason for Lrm in a 7-08.


Only hits count.
Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3480095
09/05/21 11:57 AM
09/05/21 11:57 AM
Joined: Oct 2008
Posts: 6,717
Selma
odocoileus Offline
14 point
odocoileus  Offline
14 point
Joined: Oct 2008
Posts: 6,717
Selma
Not necessary for it honestly. When I started loading .308 years ago, I worked them up with magnum primers as the old sages at the time told me they used one for any hunting loads where it could be sub 32 degrees. That advice likely came from the days of old with double base ball powders and their temperature sensitivity. These days with temp insensitive powders, that likely is no longer an issue. Magnum primers theoretically will increase pressures so always wise to work up, but it’s likely minimal.

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3480486
09/05/21 10:23 PM
09/05/21 10:23 PM
Joined: Nov 2005
Posts: 8,360
Chelsea, AL
lefthorn Online content
14 point
lefthorn  Online Content
14 point
Joined: Nov 2005
Posts: 8,360
Chelsea, AL
I just use standard large rifle primers as well. 7-08 is pretty easy to work up a load for. No need to get fancy or over power with the magnum primers

Re: Large Rifle Magnum Primers [Re: fladeerhntr] #3482029
09/08/21 09:53 AM
09/08/21 09:53 AM
Joined: Oct 2012
Posts: 1,569
Tuscaloosa
H
hawndog Offline
8 point
hawndog  Offline
8 point
H
Joined: Oct 2012
Posts: 1,569
Tuscaloosa
It made a huge difference in My 7 mag. Deviation in velocity tightened a lot, and accuracy improved. I am using a slow burning powder and the rifle has a short barrel ( for a 7 mag). I believe that it helped get a full burn of the powder. For a 7-08 unlikely to make much difference.


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