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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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DarylS
.700 member


Reged: 10/08/05
Posts: 26514
Loc: Beautiful British Columbia, Ca...
Re: 7X57 bullet choice [Re: Azone]
      #220054 - 23/11/12 10:57 AM

Azone - Good stuff, excellent results - with my last 7x57, a 1990 BRNO, I loaded up 160gr. TSX at 2,700fps. It clover leafed them, but I traded it for another CZ Hornet before I got to shoot anything with it.
Since then, I've pretty much gone with lighter bullets & if I had a 7mm today, either a 57mm or a 51mm, it would be shooting the 130gr. or 140gr. TTSX - or MRX, what ever weight is available on those bullets.

Buddy of mine who doesn't load his own needed a practice round and a hunting round for his new '06. Since it proved it didn't like 180's, we went lighter. We tried 140gr. Fed. fusions as well as the same make with the TSX - all 165's. The Fed. bullet shot into 1/2" and the TSX made nice 5/8" groups, same poi. His 224yard group ran 1 1/2", so we know he could shoot - with a rest. He proceeded to shoot his goat, sheep and elk all in the same fall with those factory TSX loads, one shot kills on everything. The elk was just over 450yards on the laser range finder - a shot I might not take, buuuuuut it was very niiiiice, hard to turn up an open shot like that. I noted your 5 point has VERY heavy beams - nice - so's the Kudu.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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albertan
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Reged: 13/06/06
Posts: 432
Loc: Alberta, Canada
Re: 7X57 bullet choice [Re: Azone]
      #220644 - 30/11/12 07:53 PM

http://www.speer-bullets.com/pdf/7mm_Mauser_DeepCurl_1639_Modern_DataFile.pdf

Their data is for new rifles only is shading 30-06 pressures. It's the among best modern loading data out there.

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Homer
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Reged: 07/04/09
Posts: 3081
Loc: Canberra, Australia
Re: 7X57 bullet choice [Re: albertan]
      #220827 - 03/12/12 05:14 PM

G'Day Fella's,

I was talking with the Australian agent www.totallyballistics.com.au for www.gscustombullets.co.za the other day, and he was saying how he was safely pushing 120grn GS Custom(GSC) bullets (a 120grn 7mm Hunting Bullet), at 3200fps out of his 7x57 rifle!
I told him that I can only safely push 120grn Barnes X and 120grn Nosler Ballistic Tips (both Moly coated), to 3350 out of my 24" barreled 7mm Rem Mag!
Apparently this has a bit to do with the GSC design of the bullet and it's ease of starting into the lands of the barrel, when compared to most other bullets!
And no, the GSC bullets, are not made under size (for caliber), to achieve this!

Because of this GSC bullet trait, it does require the use of slightly faster powder (than usual for the same combo), to achieve these higher velocity results!
That kind of tinkering is never a problem for me, just some more fun trying to get some amount of "Free Speed"!
Can't wait to give them a shot!!!

Hope that helps

Azone, has anybody told you, you look like the actor Russell Crow?

Doh!
Homer

--------------------
"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"

Edited by Homer (03/12/12 05:25 PM)

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DarylS
.700 member


Reged: 10/08/05
Posts: 26514
Loc: Beautiful British Columbia, Ca...
Re: 7X57 bullet choice [Re: Homer]
      #220841 - 03/12/12 10:08 PM

My data all stops at around 48,000CUP for 3,000fps with 120's in the 7x57. I see 7mm08 listed to 3,100fps+ using 120gr. TSX's but with one powder only in Barnes text.

I also have data for 6.5x55 and .260 Rem. pushing 120gr. at over 3,000fps.- so if the guy was stretching the 7x57 closer to 65,000psi, it's possible along with 24" or more of barrel, to get 3,200fps, I suppose. Much over 65,000psi and you exceed the elasticity of the brass and expand primer pockets as well as making extractor groove marks on the case head. As well, extraction gets sticky - that's a prime indicator to say you've gone too far.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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VonGruff
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Reged: 08/02/09
Posts: 1119
Loc: South Otago, New Zealand.
Re: 7X57 bullet choice [Re: DarylS]
      #220859 - 04/12/12 04:53 AM

I run the GSC 120gn to 3237fps in my 7x57 over BL-C2. This was the only load development I needed to do and I called the 2nd shot as I let it go. I load to the 51 gn loading and called it good. Killed a few goats with great authority.



--------------------
Von Gruff.

Exodus 20:1-17

Acts 4:10-12

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DarylS
.700 member


Reged: 10/08/05
Posts: 26514
Loc: Beautiful British Columbia, Ca...
Re: 7X57 bullet choice [Re: VonGruff]
      #220873 - 04/12/12 08:26 AM

In ctgs. & with the bullet weights that works well with it, BLC2 can be utterly amazing in the ballistics it produces.
I noticed it as listed as producing over 3,000fps with 120gr., with original-type pressures of 47,000CUP.

This powder works in my 9.3x57, 9.3x62 and .375/06IMP that I know find out has very close to a .375 Brown Whelen chamber.
In all of these, it gives top speeds with the medium and heavy bullets. In the smaller ctgs. that can use even slower powders with the heavy bullet, BLC2 would work very well with the lighter bullets as it seems to do for VonGruff in the 7x57 Mauser.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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VonGruff
.400 member


Reged: 08/02/09
Posts: 1119
Loc: South Otago, New Zealand.
Re: 7X57 bullet choice [Re: DarylS]
      #220875 - 04/12/12 09:39 AM

And in even smaller cartridges it can be a very effective powder. The Grendel has a respectable performance window with BL-C2 and it will get a try in my 6.5 GM (Grendel Max) along with CFE 223 with the 123 gn A Max bullet.

--------------------
Von Gruff.

Exodus 20:1-17

Acts 4:10-12

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DarylS
.700 member


Reged: 10/08/05
Posts: 26514
Loc: Beautiful British Columbia, Ca...
Re: 7X57 bullet choice [Re: VonGruff]
      #220927 - 05/12/12 03:39 AM

Yes - BLC2 used to be THE accuracy powder for .222 and .223 as well. Where it works well, it can do an amazing job.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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Azone
.224 member


Reged: 17/07/11
Posts: 30
Loc: Alberta, Canada
Re: 7X57 bullet choice [Re: DarylS]
      #221138 - 08/12/12 06:39 AM

One of my preferred powders for the 7x57 is H414, a spherical powder that is similar to 4350.

It produces excellent velocities and measures very consistently using a volumetric powder measure (as on a Dillon 650 or 550).

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