7mm rem mag


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MT GUNNY
August 21, 2006, 06:35 PM
Ive been using 7mm rem mag ever since i started hunting.
Ive been thinking of a different call, so I started looking through
some balistic charts and came across .284, realizing it's the same bullet.
I wonderd can I reload .284 specs in my magnum, comonsence says i can
getaway with it. but just to be safe I wanted to ask.:scrutiny:

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Chief 101
August 21, 2006, 06:56 PM
I'm not exactly sure what you are asking but to clarify on aspect, ONLY USE DATA COMPILED FOR THE CARTRUDGE YOU ARE RELOADING FOR. In other words use only reloading data compiled for the 7mm magnum.
If you wants to know if you can load 7mm Rem Mag rounds to velocity specs used by the .284 Winchester round, why of course you can, using data compiled for the 7mm mag.
For example according to my third edition Hornady Handbook it lists for lthe 284 Win: 55 gr. H4831 to propel the 154gr spire point to a velocity of 2800fps. If you want that velocity in a 7mm Rem Mag you would use about 60 gr. of IMR 4831.
If this isn't what you are talking about then one other scenario is 7mm=.284.
Same diameter barrel. Same diameter bullet. Many diferent cartridges to propel same bullet. I'm confused. Chief:barf:

MT GUNNY
August 21, 2006, 07:33 PM
7mmremmag is a hard sholder hitter
what would happen if i loaded 154 grain sp with H4831 55g (.284 win)
in belted mag case and shoot it out of my 7mm rem mag
would it be just like shooting .284 win?

NateG
August 21, 2006, 07:52 PM
First, I don't reload for either the .284 or the 7mm RemMag. But, according to the reloading manual nearest to me (Lyman #48):

The suggested starting load for a 154gr JSP bullet with H4831 is 59.0gr. For a velocity of ~2700.

The book gives a starting and max loads for a 150gr. bullet in .284 as 51 and 57gr. respectively.

I would NOT use the 55gr. load. It might be safe, but I'm not one to load outside what the book says.

As a note, it sure sounds like you're trying to use loads developed for the .284 in the 7mm. DO NOT DO THIS!!! Only use loads in the cartridge they are listed for. Let me repeat, only use loads in the cartridge they are listed for. It MIGHT work in this instance, but if so, it is a coincidence.

Using H414, the starting load is 53.5gr, for a velocity of 2570fps. That's the lowest starting velocity the manual gives. But, again, do not use a load in a cartridge other than the one it was developed.

Or, you could use a 130gr bullet with 56.0gr H414 for a velocity of 2850fps, which will probably kick your shoulder less.

But don't use loads developed for one cartridge in another. (Sorry to repeat myself so much, but this is important)

Vern Humphrey
August 21, 2006, 07:54 PM
what would happen if i loaded 154 grain sp with H4831 55g (.284 win)
in belted mag case and shoot it out of my 7mm rem mag
would it be just like shooting .284 win?

Let me illustrate the previous poster's wisdom:

From the Hodgdon manual:

284 Winchester:

154 grain bullet, 57.0 grains of H4831, MV = 2803 fps

7mm Remington Magnum:

154 grain bullet, 61.0 grains of H4831, MV = 2872 fps
The 7mm load is a starting load, takes 4 grains more powder, and is pretty close to the .284 load -- the bigger case of the 7mm makes a difference here as you can see.

If you want a 7mm Magnum load at around 2800 fps with the 154 grain bullet, go to H450. A starting load of 59.0 grains will give you 2781 fps

MT GUNNY
August 21, 2006, 08:50 PM
I wont try it, I thought it would save me having to buy a different rifle.
Ill just reduce to minimum specs acroding to my manual seirra's latest version
I could always use another rifle.

NateG
August 21, 2006, 09:39 PM
That's a good idea. You can probably find something nice and light that'll work. Some folks use, I think, blue dot (a pistol/shotshell powder) in rifle cartridges for some really light practice loads. I don't what would be a safe load for the 7mm rem mag, but I bet you could find one online. Try doing a search for Blue Dot in the handloading forum, and if you can't find something, start a thread asking for a low-recoil handload for the 7mm rem mag. Just make sure you find a few sources that say it's safe---not just one. Also, check a few other manuals, if you can. (See if you can't check out a few at your local gun shop) You might find that some powder combination and bullet weight gets you some relatively light recoil.

Off on a tangent feel free to skip if you don't like math stuff, and I'm not sure how well I'll explain it anyway... Recoil energy (which tracks pretty well to how much it hurts) a function of the square of the momentum of the bullet and powder charge that leaves the muzzle.

Note, the units are going to be all FUBAR, but for a quick approximation, take the (bullet weight in grains x muzzle velocity) + (charge weight in grains x 7000*) That will give you a value for "momentum", but not in the right units, to get to the right units, take the result (using 154 grain at 2800fps with 57 grains of powder), 830200, and divide by 7000 (number of grains per pound) to get 118.6. Now you have units of pounds*ft/sec, but (in imperial units) momentum has units of mass*ft/sec, so you have to divide by 32 ft/sec^2... Okay, 830200/(7000*32)... gives 3.71 slugs*ft/sec --recoil will be proportional to 13.8 (that is, 3.71 squared)

A 130 grain bullet at 2800fps with, say, 53 grains of powder would have a momentum of 3.28 slugs*ft/sec and recoil would be proportional to 10.8--a 20% reduction in recoil.

End Tangent...

Or, you could try Remington's reduced recoil loadings.

* some folks use 4000, some folks use 1.75 times the muzzle velocity, or some other value for the speed the powder and gasses leave the muzzle.

NateG
August 21, 2006, 09:59 PM
Accurate lists a starting load:
Sierra 140gr Soft Point Boat tail
CCI 250 Primer
27.5 Grains Acurate 5744 Powder
2050fps
Max: 45.5gr 5744
2948 fps

Or, even milder:
Speer 120gr Soft Point
CCI 250 Primer
Starting: 24.5 Grains Acurate 5744 Powder
2041fps
Max: 47.0gr 5744
3127fps

That's a pretty big range with the one powder. You could probably find a load in that range powerful enough for hunting, but lighter than normal 7mm Rem Mag loads.

But, please, double check those loads before using them. I've checked them for typos, but do the same before using them.

NailGun
August 22, 2006, 10:55 AM
Here Ya Go Lucas. A link to Hodgdon online for a youth loading of the 7mm Rem. Mag. using H-4895 powder. http://www.hodgdon.com/data/youth/7mmremmag_y.php
H-4895 is a very versatile powder, which I use frequently with good results. It is clean, consistant, and is capable of producing low and fairly high velocities depending on the loading. Good luck. Happy Shootin.

waffentomas
August 23, 2006, 01:38 AM
This is not a big deal, Lucas.

I bought a 7 mag for my son, who is 110 lbs. soaking wet. He has fired my prized .308 win. (Weatherby), but the 7 mag was used, and a great deal. It's a Savage 110 LH, as my boy is a south paw.

I load the 7 mag to levels of a .280 Remington, and it's been great. Less recoil saves his shoulder and it's still quite accurate - plus, it hardly stretches out the brass, which will increase the brass life as well.

You can safely download this cartridge.

Tom

GooseGestapo
August 25, 2006, 01:26 AM
I think that what you are wanting is to load down to the .284 ballistics with your 7mmMag.

The best way to go about this is to either look at the loading manuals you have and study the starting loads listed for your cartridge, and bullet weights. Compare this to the velocity of equivalent loads in the .284.

Like others mentioned, because of the greater case capacity of the 7-mag, you'll not be able to use the same charge weight as the .284 as the pressures will be LESS, in the 7-mag. This can also be "DANGEROUS" with certain combinations of components.

Once you determine the speed you want, look at the 7-mag data and find a match, then determine which powder type and charge you need.

Most of the 7-mag "starting" loads will coorespond closely to the "maximum" loadings of the .284.

BTW; the .284 and .280 Remington are very close, and are both just under the 7-mag in performance.

What you are wanting to do is easily "do-able" and even desireable.

Just go about it properly.

The LEE #1 and #2 (current) Manuals have a lengthy section on "reduced" loads, and other sections that encourage using the "starting" loads as a "final" loading.

Not bad advice, either.

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