7x57 Mauser Pet Loads?

My 1950 21h shoots 160gr Sierra GK over 46gr IMR4350
Just under an inch. 154gr Hornady Softs with 48.5 H414 seated long, shoes promise but makes me nervous.
I think I’ll stick with the Sierra load.
 
My 1950 21h shoots 160gr Sierra GK over 46gr IMR4350
Just under an inch. 154gr Hornady Softs with 48.5 H414 seated long, shoes promise but makes me nervous.
I think I’ll stick with the Sierra load.
 
Eagleye said:
With the 7x57. I have taken at least 30 deer [Muleys, Whitetails and Blacktails] 8 moose and 2 Elk.
Also shot several Black Bears that weighed between 100kg and 200kg.
On only one occasions did I shoot an animal a second time, and that was unnecessary, lol.
I used to shoot a lot of Partitions, but lately, the Accubonds have been the choice.
mbogo3 mentions IMR 4350 and W760/H414. These work well also, but my best accuracy
so far has been with the Alliant powders. D.
Click to expand...

I am the same. I shoot a newer model CZ, mauser action and I find IMR 4350 to work like a charm with Accubonds. I have tried H414 and IMR 4831 and neither worked very well. I think most of the time it is what your rifle likes :)
 
I also really like the 7x57 cartridge. If I had to give up my 6.5x55, the 7x57 would get the slot.

I no longer have my ZKK600 BRNO, simply because I decided on a whim I wanted to build my own rifle on an orphan Brazilian Mauser action I had on the shelf.

One thing you need to be careful with when it comes to 7x57 commercial rifles is to determine twist rates and throat depth. Some of them have very fast twist rates and very long throats. They were purpose built for the long 175 grain bullets the cartridge was originally designed to shoot. Nosler made extremely long SPBT 190 grain 7mm bullets at one time. Some of the modern 7x57 rifles wouldn't stabilize them, nor the 175 grain SPBT.

It's possible to find 7x57 chambered rifles with twist rates ranging from 1-7.5 inches to 1-9.5 inches.

There is one, almost magic load that just seems to shoot well in any 7x57 chambered rifle I've tried it in.

139 grain Hornady BTSP #2825

140 grain SPBT Sierra #1905

49.0 grains W760

CCI 250 Magnum primers.

Out of a 24 inch bbl this load generates appx 2800 fps @ 45,000 psi.

It's safe for the older M91/93/95/96 actions as well.


My go to load is with a one off powder that is slightly slower than W760, 51.0 grains of H414SL10 and it generates slightly higher velocities in my rifle, 2860 fps. THIS LOAD SHOULD ONLY BE USED IN MODERN ACTIONS, at least as strong as the Mauser 98.

Both of these loads are extremely accurate in my rifles.

You can get more out the venerable and capable 7x57 but not much with these bullets. This seems to be what my rifles and a few others like best. When velocities are increased past this point, pressures really start to climb and accuracy becomes more erratic.
 
I am running the 162 grain A-max in my M70, 46gr H4350 Winchester brass and CCI primer giving 2620 fps,
due to a mix up, (typo) when ordering a custom dial, I have increased powder charge to 48g and trying am 48.5gr,49g next time I have time.
This load is giving good accuracy, and has dumped a couple dozen red deer, a few fallow deer and the odd goat, pig and thar,
also load R19 with, 50gr with 150gr ballistic tip, for a down and dirty,
 
Obviously, work up and do all the necessary safety precautions with reloading yadda yadda ...
in a rifle very similar to yours, I had outstanding results with your 140gr bullet using:
45.5gr hodgdon h100v , CCI 200 , and in my rifle about .080” off the lands which was about 2.57” base to ogive
Didn’t keep the 7x57 as long as I should have and didn’t mess with other powders or bullets much either.
Good luck
 
In my son's Ruger #1 RSI this load works nice.

Calibre 7x57 7mm Mauser
Powder IMR 4451 Weight in Grains 46 gr
Bullet Hornady ELD-X Weight in Grains 162 gr
Primer Fed 210M Loaded OAL 3.125"
Case R - P 7 MM Mauser Weight in Grains 186 > 186.9

Note: Check your data before loading this or any load in your gun. A Ruger #1 is a modern strong action and they use a decent freebore to accommodate 175 gr bullets. This freebore reduces pressure as well.

Bottom line a 7x57 seems to like bullets in the 160 grain region and works well with powder in the 4350 burn rate area.

I hear you on brass. I bought a 100 or so 1F at a gunshow. It is R-P and seems to be decent. Weight varies but was able to get a few batches +/- 1/2 grain. It is a wee bit better than the Federal and PRVI I have. PRVI brass requires a RCBS #11 shellholder.

The 7mm Mauser is also one dandy little cast bullet rifle. Loves the old style Louvrin bullets, 287405 GC.

Nitro
 
mbogo3 said:
For starters what kind of 7x57........modern /98 mauser or rolling block/95 mauser. Win 760 is the only powder I've needed for the 140gr although IMR4350 is a close second.
Click to expand...

Hey Mbogo3, I'm new to this cartridge and just bought an O/U 7x57r/12g. What is the different between the modern and rolling block? What is the effect? I'm wanting to reload as the 7x57r are pretty hard to find and I don't want to overload.
 
You can't use the loads mentioned above as internal case capacity will be different in the rimmed version of the 7x57 and a break/hinge action gun is not near as strong as a 98 mauser.I'll see if I can find some data for the 7x57R.You can FL size .303 British brass in a set of regular 7x57 dies to make brass using the .303 British shell holder naturally.S+B and Norma make brass but hard to find and $$$$$$$$$$
A rolling block is the weakest of the lot and absolutely will not take 98 mauser loads. without bad things happening.
 
Tested some 162gr ELD Match with 50gr RL-17 in RP 7mm Mauser brass and WLR primers in a postwar German commercial 98 action Mauser.
Primer looked not flattened as much as I feared compared to my starling load of 45.5gr of RL-17
50gr loaded case primer center and 45.5gr case primer on right in ambient light and flash pictures.


 
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