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Yes the 7x57 and the 275 Rigby are the same round just different head stamps. They didn’t achieve 3,000 fps with a 160-grain bullet without excessive pressures (by today’s standards).

original load was a 173 gr round nose @ 2300fps

also a 140 gr @2750 and both loads were tested with a 28 in barrel

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the original 275 Rigby HV load was a 160 gr. bullet at 3,000 fps.

This deserves hoisting the BS flag! I don't believe it for a second.

You sure that wasn't the 275 H&H?

If memory serves me correct two loads were available for two types pf Rigby made rifles No1 and No2. A 173gr bullet at 2300fps and 140gr bullet at 2900fps. I would imagine that they used different twist rates. Hope I am correct?

IIRC, the #1 & #2 were the same except, the sights were regulated for the different trajectories of the 175 grain vs. the 140 grain bullets.

quote:

Originally posted by thirdbite:
The quote was on Nitro Express Forum. I made a typing error - it should have been 140 gr. at 3,000 fps, but that also appears to be wishful thinking to me.

Assuming a 65,000 PSI max, even the .280 Remington will be pushed to achieve this!

As I understand the 275Rigby was loaded to the same lower pressure as the 7x57. Using a 28" barrel QL says you might get there. Old data I saw for the 7x57 was a 139gr at 2740. Even allowing for a 4-6" longer barrel 3000 is about 250-300fps faster than current 7x57 factory ammo velocity listings.

With no cronograph the biggest number sells best.

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With no cronograph the biggest number sells best.

+1

Are we saying 3000fps is not possible? I recall reading somewhere else on AR that this is possible. I maybe mistaken...

P.S. Thats with a 140gr bullet

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Originally posted by lal:
Are we saying 3000fps is not possible? I recall reading somewhere else on AR that this is possible. I maybe mistaken...

It's only possible using an "AI chamber.....

After paying for the "AI" chamber and dies one is entitled to load to 75,000 PSI.....chrono0graph his load and instantly add 250 FPS to the chrony reading!

It is possible but I would not want to be the one pulling the trigger.You can get close.

One of the Nosler manuals list 140g w/ RL 19 at 2892fps. Barsness in Handloader # 246 says you can get 2900 fps w/ the Hornady 139g and Imr or H 4350 and 2800 fps w/ Noslers, TBBC, NFs or Swifts-----in a 21-22 inch barrel.

I know guys that have chrono'd their hornady superformance and it's very close to stated velocity, they list 2740 for 139g bullet, considering their stuff I hear can't be duplicated (at same pressures) I would think that handloading with a 24" or shorter barrel you're not going to get to 2900 without flat primers at least.

I just bought two boxes of hornady superformance in 30-06 and saturday am supposed to go shooting and am taking the chronograph (If I can fix the sun shade) and I'll post my findings of their stated velocity out of my 22" barrel.

Red

In my 25in barrelled 7x57 I run a 120gn GS Custom to 3235fps with BL-C2, the 139gn SST to 2900fps with 49.5gn H4350 and the 160gn Woodleigh to 2700fps with 46.5gn H4350.
Had the 150gn Scirroco to 2775 and the 150gn CoreLoct to 2830fpc. None of these are max loads, but where the best accuracy came with each bullet. Just have the 120gn GS and the 160gn Woodleigh loads now, but any of the others would do in a pinch.

Von Gruff.

quote:

Originally posted by thirdbite:
I read that the original 275 Rigby HV load was a 160 gr. bullet at 3,000 fps. Is this correct? If so, how was it accomplished? If not, what were the original ballistics? My understanding is the 275 Rigby HV is just a 7x57 Mauser. Thanks for your comments.

As posted by KWard the original load for the 275 or 7mm Rigby and the 7x57 was the 173grain bullet. The HV load for the 275 Rigby and 7x57 was the 140gr bullet. Taylor calls this load the HV when referring to the 7x57 and lists two different muzzle velocities, 2750fps for the 7mm Rigby and 2650fps for the 275 Rigby. He may have meant to call the 7mm Rigby the 7mm Mauser which of course is the true 7x57.

I have only known the 7x57 (7mm Mauser) and the 275 Rigby, both one and the same cartridges.

Dear thirdbite:

My P. O. Ackley, Handbook for Shooters and Reloaders vol. 1 shows 3000 fps with a 139 grain bullet in the 7x57 using 4064 powder.

I easily got over 3100 fps with 140 grain bullets in my now deconstructed 7x57 AI with a 24 inch Douglas barrel, using Reloder 22. I got at least five reloads with the Winchester 7x57 brass, so the pressure was just fine.

Ray Atkinson just long throats his 7x57, and I'll bet he can get 3000 fps with acceptable pressures.

Sincerely,

Chris Bemis

Take a 7x57 stick it in a 24" barrel load it to 63-65,000 and at least calculations say you can get to 3000 with a 140. I show that max pressure on the 275Rigby was less than 50,000 wich would leave you way below 3000 if you loaded to max pressure.

I reached 2880 FPS using w760 with the 140 gr. Nosler ballistic Tip in my Winchester M70 Featherweight but the load showed signs of pressure on that 110 degree day. The load would probably be OK during the cooler temps of hunting season. I droppe it back to 2800 FPS and called it good. That load at 2800 FPS was too hot though in my custom 7X57 FN Mauser with a match grade barrel and tight chamber. Back to the drawing board on that one.
Paul B.

I accurately got to 2,780fps in a 25" barrel with 140's but that was with new Norma brass and I won't give the load. Purely for trophy hunts that one ....

Anything around 2,600 - 2,650 fps is good.

Good afternoon,

I have gotten 2740fps with factory ammo and 175gn bullets (RWS), out of my 25' 1:8 twist PacNor barrel. My reloads don't go above 2700 with 140 and 150gn. Some of the excellent SA PMP ammo did clock close to 2800fps with 150gn bullets. My hunting load is a pedestrian 2550 fps but nothing has walked away from it yet, so I am happy

best wishes,

Finman

I have a Rigby Mauser in 275 Rigby due in later this week. Are there any markings Rigby used as to which load the sights were set up for? Did they mark the rifles as such?

quote:

Originally posted by Biebs:
I have a Rigby Mauser in 275 Rigby due in later this week. Are there any markings Rigby used as to which load the sights were set up for? Did they mark the rifles as such?

Although I am not 100% sure, I think that the 'classic' 7mmMauser load was for 173gn bullet, doing around 2300fps...

best wishes,

Finman

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I think that the 'classic' 7mmMauser load was for 173gn bullet, doing around 2300fps...

That was my thought as well. I love the look of the old rounds, with the exposed bullet half the length of the cartridge.

quote:

Originally posted by Biebs:
I have a Rigby Mauser in 275 Rigby due in later this week. Are there any markings Rigby used as to which load the sights were set up for? Did they mark the rifles as such?

My Rigby .275 is marked on the barrel:
"Sighted for Rigby´s High Velocity .275 Bore Cartridge Pointed Bullet 140 grs "

That Cartridge was advertised by Rigby with 3000 foot seconds.

Heavenknows that is very interesting......Does your rifle have any other markings to indicate the load? Thanks

There are no markings indicating the load.

To my knowledge there were no markings of the load on any Rigby rifles., whereas it was common on rifles made on the continent.

Concerning the advertised velocity I believe Rigby did what every ammo maker did and will do up to date:
Lying.

I believe that you will not find any powder/load ( 140grs bullet )to achieve 3000 fps without exceeding the max. allowed pressure.

Just for consideration...I don't personally believe that a load which will allow 5 reloads without making the case useless for further loading is necessarily a safe one pressure-wise.

I admit I am old and cautious, but I like what one of my early heroes, Mr. Jack O'Conner said in that regard.

To paraphrase him, he said, "If you can reload cases 20 times and the primer pockets are still tight and it looks good in all other regards, extracts easily, etc. and you can go on using it, then it is PROBABLY a safe load."

Jack, as many of you may recall, was known to use some hot loads for hunting in his day. But he knew the risks he was taking.

I would no more try to get 3,000 f.p.s. out of my 7x57s with 140 gr. bullets than I would try to fly across the Grand Canyon with the wings of Icarus.

The 7x57 or the .275 Rigby will do 2900fps with a 140 grain bullet and without any trouble. Back in the day, it did as well. The high velocity load was just that.

It is only in recent decades that they downloaded the specs for the 7x57mm because of old'96 based rifles.

Dear Alberta:

I assume that you are referring to my posting on my performance with the 7x57 AI.

Based upon that assumption, I suggest that you re-read my post more carefully. You will notice that I said that I got "at least five reloads". I did not say that I got only five reloads.

Actually, until I broke the gun down, I still reloaded all the full power cases sometimes over 10 times, if my memory serves me correctly.

The other cases are still sitting in cartridge boxes, and can be re-loaded even further.

I have found that annealing the necks at #5, #10 and #15 reloading intervals helps with keeping the bullet tension consistent, and thereby probably lowers the peak pressure.

Do you have some reloading experience to discuss, or are your opinions on reloading safety just based upon hyperbole?

Do you actually have a chronograph to check your 7x57 speeds, or has it melted like Icarus's wings?

Sincerely,

Chris Bemis

I have a Remington Mountain rifle in 7x57, I have chronographed the 139 Hornady and 140 grain Nosler Partitions at 2830 fps, that's fast enough out of a 22 inch tube.
3000 fps may be attainable, but I'm not going to be the guy trying it, 2800+ fps works well enough for me.

Biebs,
There may be a "2" engraved on the floorplate for the lighter bullet load.

I'm sure there is someone here who has shot more 7x57 handloads than me, but not many. With Winchester cases H414 or RL19, and probably Hunter I have never had any trouble reaching 2900-2925 fps with various 140's and have probably shot 6-7000 in various rifles. I embarked on an experiment with a long throated Ruger and at 65000 with a pressure trace, velocity was 3038 fps with H414 and an amount of powder that I am hesitant to print here. This one has the long throat, and some old loads I used in a Win that went 2875 fps go 2675 in this one so there can be major differences due to chambering. I don't use loads this hot to hunt with, just no reason to push the envelope, but 2900 fps is definitely a doable and safe speed with a 7x57 and a 22 in. barrel. It will at the same pressures go about 200 fps less with various 160's which means 2700-2750 at safe pressures and this is what I've used in Africa, etc for bigger stuff.

Agree with jstevens about velocities with 140 and 160 grs!!! Plus, with 175 grs in a rifle like his (and mine by the way), made with CIP chamber and leade standard or simmilar one, it is entirely safe to reach 2650 fps for a hunting load with Winchester cases and R22 powder. And I have a SAFE MAXIMUM load in my rifle with these components and 175 grs Nosler Partition at 2700 fps. But for hunting I use 1 grs less and 2650 fps.

PH

Dear PatagonHunter:

Sounds about right for the long leade 7x57.

I have a not quite full horsepower load of Reloder 22 and/or IMR-7828 in my 7x57 AI that stangely enough clocked out in both loads identically with a five shot average of 2758 fps, using 175 grain Nosler Partitions.

Sincerely,

Chris Bemis

Dear Yale,

The velocities you get in your AI are in line with mine in my standard European barrel 7x57.

Regards

PH