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Discussion Starter #1
My thread about getting the most out of the 257 Roberts is followed by another question about another round I loved to use, but has been left behind by the times. I seem to like to do things the hard way, but don’t want it to cost me a rifle, or my life.

I have a 98 action waiting to be built on. Plan is a 7x57 in a varmint type barrel and see if I can get it pushed to beyond 600yds and then maybe shoot a Jamboree with it (VHA event). The problem resides in finding loads for this round with modern actions. I would like to see a bullet with a BC above .400 flying at 3000fps out of it. Again I will probably replace the barrel later with the Ackley version, but my financial advisor (most call them wives I think), won't permit the added expense (something about my 250,000 mile truck needing a new engine, and my insisting on a 383). So has anyone played with this one? I have in the past, but I follow the manuals even though I know that this action is capable of much more.
 

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The Hog Whisperer (Administrator)
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I'd invest in a program like Quickload if I were you, and spend a little time getting to know how it works.
 

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Discussion Starter #3
Planning on it. I just got to find a way to get it on my comp out here (restricted downloading).
 

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Not really too big of a challenge here, GDC. A case full of 4350 over a Sierra 130gr Matchking bullet, shot from a 24" barrel. If you want to go with a slightly faster powder, a 95% fill rate with H414 or W760 will get ya there. I'm not sure what kind of range you will get from that bullet before it starts to lose stability, but I wouldn't be surprised if it was pretty close to your 600 yard goal.
 

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Whatever the reason my 257 and 7x57 rifles didn't like either H414 or WW 760 even though there supposedly the same powder. Some of the IMR powders are showing promise but for this deer season looks like I'll be using commerical ammo. Hope your experiences turn out better.
 

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There is no reason that the 7x57 cannot be run at 30-06 or even 308 pressures in a modern action.

My 24" barrel 7x57 is instrumented, and I run 150-160 grain bullets in it. These may not be a huge help, since you seem headed for lighter bullets and 3000 FPS, but FWIW:

Nosler 150 BT, CCI 200 primer, 50.5 grains H4350, 3.230" COL, 2864 FPS, 56.6 KPSI
Nosler 160 AccuBond, CCI 200 primer, 52.5 RL22, 3.290" COL, 2736 FPS, 55.5 KPSI

Your individual rifle will produce different results, of course.
 

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Discussion Starter #7
Actually this thread is going to help allot. I might try those loads (work up to them, I mean)
 

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Jack O'Conners loads were listed as being
100 50 grns 4064 @3,300 fps
120 48 grains 4064 @ 3,100
140 45 grains 4064 @ 2,815
160 50 grains of 4350 @ 2825
175 46.5 grains of 4350 @ 2650

Be advised, those are H-O-T and you won't find them in any book printed today.

At 600 yards, you want the higher BC of the longer bullets.
 

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Discussion Starter #9
Thanks. I will be working up to them of course. It is hard when everyone lists only loads for the 95 actions. I understand the liability, but this round has always been a favorite of mine and could do so much more than the books list.
 

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gdcpony, Once you set a BC of .400 as a minimum and a velocity minimum of 3000 fps all the manuals I have say you can't get there from here. I can't find a single bullet with a BC of .400 that isn't above 140gr. Some are 150gr. The 7mmX57 case is too small to achieve the 3000 fps MV. Unable to help you on this one.
 

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7X57 calber
Nosler #6 new book with 120 grain and 417 bc is with 3000 fps or more are
4064 47.0 gr 3000 fps
rl15 44.5 gr 3001 fps
imr 4320 47.0 gr 3008 fps
imr 4895 45.0 gr 3020 fps
hunter 53.5 gr 3040 fps
n150 46.5 gr 3047 fps
 

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gdcpony, Once you set a BC of .400 as a minimum and a velocity minimum of 3000 fps all the manuals I have say you can't get there from here. I can't find a single bullet with a BC of .400 that isn't above 140gr. Some are 150gr. The 7mmX57 case is too small to achieve the 3000 fps MV. Unable to help you on this one.
You must not have the right manuals. ;)

The Sierra I mentioned, along with options from Hornady, Nosler and Barnes all offer better than a .400 BC, in a 120-130gr bullet that will reach 3,000fps. Also, you can get pretty close with 140gr bullets. I have never been overly concerned with reaching an exact velocity, so long as the accuracy is there at something close to what I had expected.
 

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Discussion Starter #15
I will pick up that manual. It seems to have all the info I want. I am messing with a .257Roberts too. I love the two cartridges.
 

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Discussion Starter #18
New info! ER Shaw just added 7x57Ack to their reamer list. For no extra cost I can't lose! And I'll be able to use factory fodder if needed! Now for some loads for that! Anyone got any?
 

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7X57 calber
Nosler #6 new book with 120 grain and 417 bc is with 3000 fps or more are
4064 47.0 gr 3000 fps
rl15 44.5 gr 3001 fps
imr 4320 47.0 gr 3008 fps
imr 4895 45.0 gr 3020 fps
hunter 53.5 gr 3040 fps
n150 46.5 gr 3047 fps
In all of the years I've loaded Nosler bullets of different types, I don't recall ever getting within about 200fps of their listed velocities.
 
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