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This is a discussion on 7x57 within the Ammo Dump forums, part of the Firearm Forum category; Acquired a M77 in 7x57 this summer and am anxious to hunt with. I need a mag spring and follower and, advice on where to ...


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Old October 11th, 2016, 08:34 PM   #1
 
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7x57

Acquired a M77 in 7x57 this summer and am anxious to hunt with. I need a mag spring and follower and, advice on where to buy bullets online for this awesome machine. Happy hunting.



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Old October 11th, 2016, 09:16 PM   #2
 
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I like Midway USA they have treated me good, try Hornady 139 grain Spitzer bullets for your 7x57.
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Old October 12th, 2016, 06:11 AM   #3
 
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Also look at Graf and sons, any of the 139-140 grain bullets, but see which one shoots best in your gun? You didn't say if you reload or going to use factory.
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Old October 12th, 2016, 12:31 PM   #4
 
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Do a 'google' for Prvi Partisan 7x57. Good ammo in reloadable brass, bullets are 158gr SP. There are lots of choices for bullets, starting at 120 gr to 175 gr 7mm . Midways is good but there are more than a few sites who do carry the bullets. Don't forget your local LGS and gun shows.
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Old October 12th, 2016, 12:42 PM   #5
 
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Thanks everyone...I was reading about the heavy load 173 performing well in the M77 becuause of the 1:8.75 twist. Apparently the faster twist was designed for the heavy grain. I bought three boxes of 173 gr. and then realized it was for (Rimmed). Now Im stuck with $80 worth of bullets I cant shoot. Any of you fine folks know someone who could use them? thanks again for the leads on where to buy.
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Old October 12th, 2016, 12:45 PM   #6
 
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Go to S.G. Ammo in Stillwater, Okalhoma..they have PRVI partisan in 139 grain and also in 158 grain PRVI Thunder...great ammo and great brass for reloading on down the line....I shoot it all the time in my Interams MarkX unless I'm shooting my handloads.

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Old October 12th, 2016, 10:17 PM   #7
 
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thanks for all the leads on ammo
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Old December 8th, 2016, 04:28 AM   #8
 
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Petrol and Powder has a spectacular aura aboutPetrol and Powder has a spectacular aura about
The 7 x 57 is a great round and one of the iconic centerfire cartridges that has been with us since the late 1800's.
The OP is correct about the twist rate of his M77 being suitable for heavier bullets (170 -175 grain). While many of the newer rifles chambered in 7mm Mauser will shoot the lighter grain bullets (130-150) the older military rifles and the ones with the faster twist rates, like that M77, will generally shoot the heavier ones better.

The pressures for factory loaded 7 x 57 ammo are held a little low due to the older small ring Mauser rifles that are out there. However, with the 173gr soft point the factory ammo 7 x 57 will perform very well. In fact, that round has a LONG track record of success.

As the OP found out, the R in the 7 x 57R stands for Rimmed.
The 7mm Mauser or 7 x 57 is a rimless bottlenecked cartridge that headspaces on the cartridge shoulder.

I would recommend the OP shoot different bullet weights in his M77 to confirm what produces the best accuracy but my guess is the 173 grain will be the winner.

The 7 x 57 has almost been killed off by rifle manufacturers, which is a shame. While ammo is available for the 7mm Mauser, there aren't many manufacturers making new rifles chambered in that fine cartridge.

Federal makes a fine 7mm Mauser cartridge with a 175 grain round nose soft point:
DSCN1731.JPG

Good Luck !
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