7mm mag. loads

twinkleback · December 1, 2007, 02:35 PM

Just got a 7mm magnum given to me and was wondering about some handloads. I've got a bunch of H4831 powder I use for my 30.06 and would like to use the same powder. I'm planning on shooting 175 grain bullets so any info out there would be helpful. My old reloading manuals all give different max.loads so who knows.....?

williamd · December 1, 2007, 05:06 PM

Love H4831 (new and surplus) in my 7MMM. Just fill the case! Really 65g to 70g behind a 160g Nosler or a 162g Hornady are great. I use Magnum primers, most any brass.

In my '06 I use 58g of H4831.

HankL · December 2, 2007, 10:17 AM

This might be an ok question if you specified what round you are looking at loads for. Remington, Weatherby, all the different shorts etc.
Not trying to pull your chain but assuming and reloading don't go hand in hand.

Be safe.

twinkleback · December 2, 2007, 12:34 PM

Okay to be more specific I am looking for a load for A 7mm remington magnum using H4138 and aeither a 175 grain sierra or hornady bullet. Looking to be shooting out to 300 yards on elk.

rgitzlaff · December 3, 2007, 09:58 AM

Yes, H4831 is fine to use in the 7mm Rem Mag and a 175gr bullet. You should be able to push that bullet to around 2800 fps with that. Make sure you use a magnum primer as well.

RDub · December 4, 2007, 08:53 PM

Absolutely! Back in the day when the 7mm Rem Mag first appeared, H4831, then just called 4831, was the powder of choice and worked well with 175gr bullets.

You will have to come with a max load on your own because with 7mm Mags, there is a wide variation in chamber dimensions from manufacturer to manufacturer. One gun may max out at 63 grains, while another may max out at 68.. You dont know until you work up. Different makes of brass will make a difference also.

I would start out with.. Winchester LRP or CCI250 primers, 61 grains H-4831 and shoot three round strings, at a target, with a good rest, in .5 grain increments. Keep going until you start seeing pressure signs, flat primers, sticky extraction. When you do see these signs, consider one full grain LESS max. In doing this you will not only see what max is for H4831, but you will most likely see where the most accurate charge is.

If you are really ambitious, do this all over again with a different primer..

When I am working with a new rifle like this, I assemble my rounds at the range. I shoot three, then assemble the next three rounds. That way I dont have to pull bullets if I loaded too many too hot.. It also gives me something to do while the barrel cools..

rgitzlaff · December 5, 2007, 09:05 AM

What RDub said, except for the primers. The 7RM should use large rifle magnum primers. Regular large rifle primers will work, but I think the magnum will give it more complete and consistent ignition.

ForneyRider · December 5, 2007, 10:20 AM

http://data.hodgdon.com/cartridge_load.asp

One is IMR, the other is Hogdon.
Minimum is 54gr for Hodgdon, and 55gr for the IMR.
Maximum was 58gr in either case.

H4350, Reloader 19, or Reloader 22 are good choices as well.

175 GR. NOS PART 175 H4831 .284" 3.290" 55.0 2532 45,800 CUP 58.0 2660 50,200 CUP

175 GR. NOS PART 175 IMR 4831 .284" 3.290" 54.0 2540 50,100 PSI 58.0 2710 58,700 PSI

[edit]I'll look up the Nosler info...[/edit]

RDub · December 5, 2007, 10:23 PM

Hi Rgitzlaff

The reason I included W-W primers is because they are the 'hottest' of the standard primers, and they ignite a charge of H-4831 very well.

Back in the day, Win did not offer a 'mag' rifle primer. They just had one called 81/2-120 or Winchester 120, which was plenty hot enough to ignite winchester ball powders. Winchester even recommends this primer for the .300 Win Mag.

It is believed that W-W has not changed the formulation of these primers since the designation was changed to WLR.

I have used these primers for years with many magnum cartridges with great success. They are a very hot primer.

Of course if you are talking about CCI200, Fed210, or Rem91/2.. In this case I would agree..

Dr Spin · March 8, 2009, 09:13 AM

Could I ask for a rough guide for overall length for my 7mm Rem Mag. I have switched from 154gr Hornady SST which I loaded to 83mm to Nosler softpoint partition 175gr.
The bullets ogive is a lot wider so I just wondered what I should start at. Without adjusting my bullet seating die they are coming out at 81.5mm.

NBmy Vihta viouri reloading manual suggested 62.5 gr N165 for 2772fps and when I chronoed my homeloads yesterday I got 2780!

Cheers Dr S

okie2 · March 8, 2009, 09:37 PM

first I will give my vote to reloader 22
When i look for a good load in each of my rifles I load 5 each with 5 different
powders (25 shells)to see which is best and then tune that one and I have yet to end up with 4895 to be the best a lot of the time it was the worst.
I bought a used savage 110 7 mag ended up with a .181 3 shot group with
reloader 22 68 grains and 140 balistic tips.
I don't use hogdon powers much anymore.

December 1, 2007, 02:35 PM	#1
twinkleback Junior Member Join Date: December 1, 2007 Posts: 5	7mm mag. loads Just got a 7mm magnum given to me and was wondering about some handloads. I've got a bunch of H4831 powder I use for my 30.06 and would like to use the same powder. I'm planning on shooting 175 grain bullets so any info out there would be helpful. My old reloading manuals all give different max.loads so who knows.....?

December 1, 2007, 05:06 PM	#2
williamd Senior Member Join Date: March 13, 2007 Location: SoCal Posts: 801	Love H4831 (new and surplus) in my 7MMM. Just fill the case! Really 65g to 70g behind a 160g Nosler or a 162g Hornady are great. I use Magnum primers, most any brass. In my '06 I use 58g of H4831. __________________ "Outlaw guns and only outlaws will have guns!" Unfortunately, we may be moving in that direction. NRA Benefactor, Conservative!, VN '64-'65. Never sell a gun or a car ... and retire rich!

December 2, 2007, 10:17 AM	#3
HankL Senior Member Join Date: March 11, 1999 Location: The Sunny South Posts: 2,174	This might be an ok question if you specified what round you are looking at loads for. Remington, Weatherby, all the different shorts etc. Not trying to pull your chain but assuming and reloading don't go hand in hand. Be safe. __________________ Check 6

December 5, 2007, 10:20 AM	#8
ForneyRider Senior Member Join Date: December 4, 2007 Location: Forney, TX Posts: 725	http://data.hodgdon.com/cartridge_load.asp One is IMR, the other is Hogdon. Minimum is 54gr for Hodgdon, and 55gr for the IMR. Maximum was 58gr in either case. H4350, Reloader 19, or Reloader 22 are good choices as well. 175 GR. NOS PART 175 H4831 .284" 3.290" 55.0 2532 45,800 CUP 58.0 2660 50,200 CUP 175 GR. NOS PART 175 IMR 4831 .284" 3.290" 54.0 2540 50,100 PSI 58.0 2710 58,700 PSI [edit]I'll look up the Nosler info...[/edit] Last edited by ForneyRider; December 5, 2007 at 10:26 AM. Reason: Add Nosler data.

March 8, 2009, 09:13 AM	#10
Dr Spin Member Join Date: April 29, 2007 Location: North East England Posts: 21	OAL 7mm Rem Mag with 175gr Could I ask for a rough guide for overall length for my 7mm Rem Mag. I have switched from 154gr Hornady SST which I loaded to 83mm to Nosler softpoint partition 175gr. The bullets ogive is a lot wider so I just wondered what I should start at. Without adjusting my bullet seating die they are coming out at 81.5mm. NBmy Vihta viouri reloading manual suggested 62.5 gr N165 for 2772fps and when I chronoed my homeloads yesterday I got 2780! Cheers Dr S

December 2, 2007, 12:34 PM	#4
twinkleback Junior Member Join Date: December 1, 2007 Posts: 5	Okay to be more specific I am looking for a load for A 7mm remington magnum using H4138 and aeither a 175 grain sierra or hornady bullet. Looking to be shooting out to 300 yards on elk.

December 3, 2007, 09:58 AM	#5
rgitzlaff Senior Member Join Date: January 8, 2006 Location: Madison, WI Posts: 524	Yes, H4831 is fine to use in the 7mm Rem Mag and a 175gr bullet. You should be able to push that bullet to around 2800 fps with that. Make sure you use a magnum primer as well.

December 4, 2007, 08:53 PM	#6
RDub Member Join Date: November 13, 2007 Location: Southern Oregon Posts: 30	Absolutely! Back in the day when the 7mm Rem Mag first appeared, H4831, then just called 4831, was the powder of choice and worked well with 175gr bullets. You will have to come with a max load on your own because with 7mm Mags, there is a wide variation in chamber dimensions from manufacturer to manufacturer. One gun may max out at 63 grains, while another may max out at 68.. You dont know until you work up. Different makes of brass will make a difference also. I would start out with.. Winchester LRP or CCI250 primers, 61 grains H-4831 and shoot three round strings, at a target, with a good rest, in .5 grain increments. Keep going until you start seeing pressure signs, flat primers, sticky extraction. When you do see these signs, consider one full grain LESS max. In doing this you will not only see what max is for H4831, but you will most likely see where the most accurate charge is. If you are really ambitious, do this all over again with a different primer.. When I am working with a new rifle like this, I assemble my rounds at the range. I shoot three, then assemble the next three rounds. That way I dont have to pull bullets if I loaded too many too hot.. It also gives me something to do while the barrel cools..

December 5, 2007, 09:05 AM	#7
rgitzlaff Senior Member Join Date: January 8, 2006 Location: Madison, WI Posts: 524	What RDub said, except for the primers. The 7RM should use large rifle magnum primers. Regular large rifle primers will work, but I think the magnum will give it more complete and consistent ignition.

December 5, 2007, 10:23 PM	#9
RDub Member Join Date: November 13, 2007 Location: Southern Oregon Posts: 30	Hi Rgitzlaff The reason I included W-W primers is because they are the 'hottest' of the standard primers, and they ignite a charge of H-4831 very well. Back in the day, Win did not offer a 'mag' rifle primer. They just had one called 81/2-120 or Winchester 120, which was plenty hot enough to ignite winchester ball powders. Winchester even recommends this primer for the .300 Win Mag. It is believed that W-W has not changed the formulation of these primers since the designation was changed to WLR. I have used these primers for years with many magnum cartridges with great success. They are a very hot primer. Of course if you are talking about CCI200, Fed210, or Rem91/2.. In this case I would agree..

March 8, 2009, 09:37 PM	#11
okie2 Member Join Date: March 8, 2009 Location: terlton, oklahoma Posts: 93	looking for accuracy first I will give my vote to reloader 22 When i look for a good load in each of my rifles I load 5 each with 5 different powders (25 shells)to see which is best and then tune that one and I have yet to end up with 4895 to be the best a lot of the time it was the worst. I bought a used savage 110 7 mag ended up with a .181 3 shot group with reloader 22 68 grains and 140 balistic tips. I don't use hogdon powers much anymore.