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7mm rem mag load development
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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Bako1987
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Joined: Sep 03, 2020
Posts: 4

PostPosted: Wed Oct 28, 2020 11:20 am    Post subject: 7mm rem mag load development Reply with quote

Okay went out today with my 7mm rem mag with my first load development.
Norma casses
ELD-X 175gr tips
361 powder
Loaded the following
62gr
62.5gr
63gr
63.5gr
64gr

I got speeds ranging from 2850FPS to 3250FPS

Is this to much or is it to low

What are your preferred speeds with a 7mm Rem Mag

Got my best grouping with the 63 and 64Gr loads
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Vince
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Joined: May 25, 2005
Posts: 15748
Location: Brisbane AUSTRALIA

PostPosted: Wed Oct 28, 2020 2:21 pm    Post subject: Re: 7mm rem mag load development Reply with quote

Speed is nice to know, but it’s not the “be all, end all”. A critter isn’t going to know or feel the 400 FPS difference. Dangerous game might though.

The most important thing is pressure signs. That is the primary reason we start around the minimum charge weight of powder and work up slowly watching for pressure signs as we go. Things like excessive recoil, cratered primers, hard extraction of fired cases etc. The added bonus of this load development is finding that sweet spot where groups close up and become accurate. Another upside is case life is increased with less than earschplittenloudenboomer max loads.

I am not familiar with the 7mm Rem Mag, but load development is pretty much the same with every calibre, as are pressure signs. Have a read of the Articles on the front page of this Forum...there are a couple of articles there that cover accuracy and finding it in your load development.

Good luck with your load development mate...I am going through similar with my Jungle Carbine in .303...it’s fun and one of the most enjoyable parts of handloading.

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PaulS
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Location: South-Eastern Washington - the State

PostPosted: Wed Oct 28, 2020 2:54 pm    Post subject: Re: 7mm rem mag load development Reply with quote

That velocity sounds a bit high for the bullet weight but I am unfamiliar with the powder type so I could be wrong. Velocities in my manuals top off at 3000 fps for the maximum listed loads. None of my manuals list your powder so what do your books tell you?

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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
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Always check data against manuals
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Bako1987
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PostPosted: Wed Oct 28, 2020 10:32 pm    Post subject: Re: 7mm rem mag load development Reply with quote

I have a hornady reloading book that gives you all the different loads for different points
the book i have is a bit old and does not have the loading data for 175gr ELD-X points, so i went with what they gave on another 175gr tips data

in there they used a different powder ( cannot remember exactly which it was)

the speeds they indicated there was a bit lower ranging from 2700 to max 2900

the powder is is localy manufatured in South Africa, have been using the same powder in my 30-06 and i have that one on its best at about 2500FPS

with the current speeds i am getting fro the 7mm the primers look good i cannot see any indication that the load is to hot which just tells me that i can still go a bit faster

But thanks guys, i will keep you posted as i continue oad development
currently best grouping at 100m was one inch

Remington guarantees a 3/4 group so if i get that i will be very happy

Cheers guys
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Elvis
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Joined: Jul 27, 2008
Posts: 9278
Location: south island New Zealand

PostPosted: Thu Oct 29, 2020 12:38 am    Post subject: Re: 7mm rem mag load development Reply with quote

400 extra fps from 2 grns of powder in large capacity case........
if you have good grouping at 63-64grns....go with that and be happy. pushing for the last fps is only going to end in tears....particularly if you out on stinking hot day,the load will be waay hotter than during testing.
at end of day its your rifle and your face next to it when you pull trigger.
pretty sure some folks getting really random pressures with the new eld range so as always it pays to start low n work up.....

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pete4d
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Joined: Nov 27, 2011
Posts: 957
Location: Dixie , Alabama , & Louisiana

PostPosted: Thu Oct 29, 2020 2:01 am    Post subject: Re: 7mm rem mag load development Reply with quote

This has had me stumped for a few days,,,finally found the powder as it has the 7mm mag listed , but no load data yet Scratch found it hope it helps

hitecharms.com/product...wder-500g/

Load Data Here ; www.somchemreload.com/...&f=116



CASE LENGTH
CARTRIDGE OVERALL LENGTH
7mm Remington Magnum
BARREL
LENGTH POWDER CASE PRIMER BULLET
grains COL
mm
LOAD
TYPE LOAD
grain VELOCITY
ft/s V/C
factor
24" S361 PMP PMP 130gr PMP SP 83.0

Start 68.2 3 036 44.5 Max 71.8 3183 44.3

152gr PMP SP 82.0

Start 63.8 2 793 43.8 Max 67.1 2924 43.6

170gr PMP SP 82.5
Start 62.2 2 651 42.6 Max 65.4 2812 43.0 Cheers

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When the SHTF I'm gonna hunker down until all those idiots kill each other. up-date

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pete4d
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Joined: Nov 27, 2011
Posts: 957
Location: Dixie , Alabama , & Louisiana

PostPosted: Thu Oct 29, 2020 2:18 am    Post subject: Re: 7mm rem mag load development Reply with quote

Should have added my .02 cents, opinion Scratch

Looks like the load you're working on may be a little on the high side , maybe back off too the 2800 fps range for longer barrel and case life .... Cheers

After reading their site , they have a good powder and ammo history ,,,,,

_________________
"march to the sound of the guns and shoot everyone not dressed like you"--D I 1968

When the SHTF I'm gonna hunker down until all those idiots kill each other. up-date

The secret to enjoying life is to never take it too seriously, as you will never make it out alive!

I'm on the watch list are you ?
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Bako1987
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Joined: Sep 03, 2020
Posts: 4

PostPosted: Fri Sep 24, 2021 6:55 am    Post subject: Re: 7mm rem mag load development Reply with quote

Okay so this was a fun couple of months
after alot of testing
I found that th63gr is the best for me, its a good speed and i feel very comfortable with that

Grouping is very good with this load and my 175Gr ELDX points

Thank you all for you support and feedback, you guys really did help me allot
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