7mm Mauser 175gr Loads - 10 Different Powders

Andy

Andy

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I have a Brazilian M1908 sporter with which I'd like to hunt next fall, and with its long throat, the only bullets that get within 0.030" of the rifling, while sufficiently seated in the neck, are the 175 gr Hornady RN's. That's ok, as my max shot distance would be 200 yds, and that bullet will penetrate through three deer lengthwise!

The picture below illustrates the throat length (with the inverted bullet), and the other two show how far out I can seat the bullet.

7X57_175gr.JPG


I intend to load to 7mm-08 pressures, but with the greater capacity of 7X57, the long OAL, and the high capacity of Winchester brass I use, I have about 5 grs more capacity than a 7mm-08 - i.e. about 8% more.

I searched high and low for 7X57 loads for a 175 gr bullet at "Modern Action" pressures, but there isn't much out there beyond 4-5 different powders, so I loaded up 30 rounds - three of each for 10 different powders. Here are the results:

7X57
Winchester Brass
CCI 200 primers (non-magnum - used for ball powders as well)
175 gr Hornady RN
OAL 3.165"
23" barrel
0 degrees Celsius

1. H414 - 45.0 grs - 2400 fps (ball powder)
2. Re17 - 45.0 grs - 2350 fps
3. H4350 - 45.0 grs - 2275 fps
4. Superformance - 50.0 grs - 2475 fps (ball powder)
5. H4831 - 50.0 grs - 2375 fps
6. Re19 - 48.0 grs - 2250 fps
7. Re22 - 52.0 grs (full) - 2500 fps
8. IMR7828 - 53.0 grs (full) - 2475 fps
9. Re25 - 53.0 grs (full) - 2325 fps
10. H1000 - 53.0 grs (full) - 2325 fps

I placed them in the sequence that I think reflects their relative burn rates with the components I used - from fastest to slowest. Their were no major surprises, although H414 presenting so much faster than H4350 was unexpected, and Superformance is supposed to be about the same burn rate as H4831, but it's quite a bit faster. Further - what's with Re19? It could turn out to be slower than Re22, and almost the same as Re25!

I think I'll do more work with H4831 and H1000 as they showed the smallest SD, and are said to be least affected by temperature changes.
 
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H1000 was very temp sensitive in my 6.5-284

here is some info from my log of the Horn 175 in a 98 Mauser.

H414 42.5=2300 44.4=2465
W760 44=2440
H4831 46=2400
RL19 48=2500
RL21 44=2500
RL22 51c = 2600
7828 47.4=2300
7828 50 = 2470


These loads are all in the same rifle, over a span of 30 years. I seated the bullet to the groove, not close to rifling, because I had several rifles in this caliber. The milder ammo was suitbable for the small ring rifles.

RL22 is one of my favourite powders. I use it in 6.5x55 and 6.5-08AI target ammo, too. It seems to produce accuracy and top velocity. I would think the loads at and above 2500fps are at max pressure for the '98 and not suitable for lesser actions.
 
This is a good thread. If anybody else wishes to share their recipes for 7x57, please do so. I plan to purchase the dies for 7x57 so that I can start shooting proper full power handloads out of my large ring 1947 FN model 1930 (98 Mauser) and my small ring 1946 FN lightweight sporter (98 Mauser).
 
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The Kurgan said:
This is a good thread. If anybody else wishes to share their recipes for 7x57, please do so. I plan to purchase the dies for 7x57 so that I can start shooting proper full power handloads out of my large ring 1947 FN model 1930 (98 Mauser) and my small ring 1946 FN (98 Mauser).
Click to expand...

My 7x57 load in with a Barnes TSX 140gr bullet with reloder 19 powder. My rifle is a 95 with a 26 inch Shilen barrel. FS
 
Fassteel said:
My 7x57 load in with a Barnes TSX 140gr bullet with reloder 19 powder. My rifle is a 95 with a 26 inch Shilen barrel. FS
Click to expand...

Boy that's a real contribution. Let me guess - you refuse to give out more info to protect yourself from litigation?
 
My pet load with 175 grain bullets in my M700 Classic is 51 grains of Norma MRP.
Graphs just shy of 2600 in that rifle, and shoots very well, indeed.
Start down a couple of grains and work up.
Eagleye.
 
I think your choice of the 175 gr. is the best choice anyways, these long bullets are what made this and the 6.5s famous among hunters of the day.
 
Ganderite said:
H1000 was very temp sensitive in my 6.5-284

......

RL22 is one of my favourite powders. I use it in 6.5x55 and 6.5-08AI target ammo, too. It seems to produce accuracy and top velocity. ...
Click to expand...

Interesting.

I have found H1000 to be very consistent and temperature stable, but have gone with the "Internet Folklore" on Re22 being the opposite - big lot-to-lot variations and temperature sensitive. In practice, I have found Re22 to be accurate and produce top velocities like you, but never tested a load over broad temperature ranges.

How temperature and lot stable do you find Re22 to be?
 
Sheesh!! Temperature sensitive/insensitive.
I believe this is very much overrated.
Granted, some powders are more sensitive to temperature variations than others, but that is most important to LR target shooters, not to hunters.
One should always shoot his hunting load at the temperatures he will be hunting in anyway.
Later lots of H1000 are classed as "Extreme" by Hodgdon, earlier lots were not.
RL22 does lose a bit of velocity in very cold temps, but it amounts to 1" at 200 meters in my 308 Norma Mag, using the 180 grain TTSX, between +20ºC and -20ºC.
Hardly a cause for getting excited.
Regards, Eagleye.
 
175gr Hornady RN
PMC cases
WLR primers
46.0grs of AA4350 powder
OAL - 3.05"
Average velocity - 2525 fps

This is my pet load for my Oberndorf Model B

I've used this same load with both 175gr Remington SP, and 175gr Norma SP, with nealy identical results. My Brno 21H really likes the 175gr Remingtons at 2550fps.
 
I hope to see more posts here!
I have a CZ and a nice old 98 Mauser in this calibre........and a whole bunch of 160 or 162 g KKSP that I want to put to use. I also have some lighter bullets.
Cheers
Therion
 
I was just checking out Hogdgon's web site and Hybrid 100V is shown as giving 2300fps with a 175gr Partition at a very low 40,800 CUP. Not only is that the top velocity, it is the lowest pressure by 4,700 CUP. It is a compressed load, so I wonder how it would do in your situation where you can seat your shorter round nose out even farther due to your chamber.
 
Am glad to see Andys research on the 7x57. I have a 93 sporter and went modern by getting a 98 from Tradex. It is a very effective cartridge, and all the loads are less than 50 grains of powder. I use CF7900 that I got from Higginson, I get 2600 in the long barrreled 98. I use 48 grains of powder behind 175 grain speer mag tips.
 
Well, I have several 7x57 Brazilians. The 1908 rifle, 1904 carbine and the 1935 rifle. I have each of them in milspec configuration and one of each of them in sporter configuration.

I have a pet load that works extremely well in all of them

I like this load because it gives minute of angle or better in exc condition rifles.

The other reason I like the load is because it is safe in the 93 and 95 actions as well.

With my aging eyes, it's easy to pick up the wrong box.

The powders for both of them, is either W760 or that great old Higginson's powder H414SL10, which is slightly slower than H414/W760.

For the 140 grain bullet, velocities checked from a Universal Receiver/24in bbl and quoted by LYMAN

49.0 grains W760 - 2721 fps - 39,700cup or 47,163 psi . (slightly faster according to my chrony in 29in bbls)

For the 175 grain bullet, same source as above,

44.5 grains W760 - 2478 fps - 45,700cup or 54,291psi .

I use both of those loads exclusively with magnum rifle primers.

As far as temperature sensetivity goes, I have used both of those bullet weights at -35C and at +30C and honestly, haven't noticed any poi difference out to 300 yds worth mentioning or that I can blame on temp.

No, I haven't chronied at those temps. My records indicate velocities were taken at +28C.

IMHO, the reason for consistent velocities, is the use of magnum primers as I always do with Ball powders.

Case life seems to be endless and the velocities are about 100fps slower than the faster IMR 4320 and IMR 4895 loads listed. The manual doesn't list pressures for these powders because they were tested in a 29in bbl 95 Mauser. I don't know, but would suspect pressures to be around 45,000 psi.

There is one more load I played with and it's very close to a 7-08 load.

Again, it's with W760 and I believe it's running close to 50,000psi (my assumption only)

It chronies at 2875fps with a 140grain bullet and magnum primers. Accuracy is in the one minute of angle, from the bench.

I save this load for the 7-08 as it's very close in capacity. Because the 7-08 case is slightly smaller, the pressure is more likely around 55,000 psi. That is safe in the Rem Model 7 action IMHO.

In a 22 in bbl, it chronies at 2775 fps.

I've used these loads on wolves, coyotes, moose, black bear, deer and elk. Never had a reason for a second shot. Mind you, all of the animals were taken from 50 yards to 200 yards. None went further that 25 yards after the hit.

Another thing, the Brazilians, switched to a 139 grain spitzer steel jacketed bullet when they went to the 1904/1908 rifles.

The velocity was rated at 2950fps out of a 29in bbl. This information comes from WHB Smith's The Book of Rifles.

I have some 7x57 Brazilian surplus cartridges and pulled a couple of them apart. The powder is a ball style and the bullet is a flat base spitzer fmj, with and exposed lead base that weighs exactly 139 grains.

I think you should measure the twist rate on your rifles, I think you will find it to be 1-9.5in. That will stabilize the 175 grain but is optimal for the 139 grain.


1899, politely pointed out an error in my post.

He's right, I posted the pressures in pounds per square inch (PSI). I should have posted Copper Units of Pressure (CUP)

Multiply my posted pressures by 1.188 for PSI rates
 
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buckbrush said:
in my Brno 22h 7x57

175 Corelokt 56 IMR 7828 = 2850 FPS AT 3.310 L.O.A

160 Nozler Partion 54 Hogdons 4350 = 3000 fps at 3..3 L.O.A.

'' '' '' '' 57 Reloader 19 = 3017 fps '' '' '' ''''
Click to expand...

Those loads sound extremely hot...and dangerous.

In fact I suspect you made a mistake as I doubt you could fit that amount of powder (all 3 charges) in the 7x57 case.

I have to say nobody reading that post should attempt any of those loads!!!
 
1899 said:
Those loads sound extremely hot...and dangerous.

In fact I suspect you made a mistake as I doubt you could fit that amount of powder (all 3 charges) in the 7x57 case.

I have to say nobody reading that post should attempt any of those loads!!!
Click to expand...

X2.

In the 7X57, the COL looks to be too long (3.300" would not have the bullet seated in the neck), and that amount of powder would fill the case to the top of the neck.

Those are 7mm Rem Mag loads........ :eek:
 
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