25-7prc or 25 saum

[762 ULTRAMAGA]

I've recently really been enjoying the 25 cals. Built a 25 creed and its just awesome.

Now I plan on building a dedicated 25 cal hunting rifle that I can put a 16-18 inch barrel on and still get close to that 3000 fps mark with the high bc .257s.

I'm thinking that would probably have to be a 25-7prc as it has a touch more case capacity over the 7 saum i believe.

That means I'll need a long action. 25 saum would probably fit fine in a short action but the prc won't. Medium would work for either but im not sure how I feel about mediums. I think it limits rifle build components compared to a long or short.

Anyone have data or experience with either cartridge?

I'm trying to understand the benefit of a 257 over a 264, have you run the 134 eldm in your 25 creed? And if so what velocity are you getting
I have a 16" 6.5 saum and velocity with 147s is just under 2800 with H1000, RL26 is closer to 2900

 

[WKR]

How fast are you running the 145s in your creed and what bbl length?

I haven't taken it up to pressure yet and the barrel isn't broken in but right now I have a load that shoots .6 moa 5 shot groups with 12 fps ES and 4 SD at 2800 fps muzzle. 23 inch barrel no can.
I suspect after break in speed up and a can ill be close to 2900.

And like I said I havent pressure tested. I might find a node higher than what I'm at.
This is with 42.5 H4350. Blackjack reamer throated for 133 berger eh at 2.850 coal.

 

[WKR]

I'm wondering how short of a barrel I can get away with and still get 3000 fps...would 17" finish be to risky? On the 25-7 prc

 

[WKR]

I'm trying to understand the benefit of a 257 over a 264, have you run the 134 eldm in your 25 creed? And if so what velocity are you getting
I have a 16" 6.5 saum and velocity with 147s is just under 2800 with H1000, RL26 is closer to 2900

I dont know if there is one, just a matter of taste and choice really...maybe a little less recoil and a little more speed comparing apples to apples.

I am running the 134s now, just shot a 1 day match with them yesterday. But its more of a break in load that shoots decent than trying to chase speed. 134 eldm over 43 grains N555 2760 fps avg, 23 inch bbl. But as stated before it hasn't sped up yet.

If I was to seriously develop a hunting load with better speeds I'd switch to h4350 or another powder other than n555.

 

[ACHILLES]

I haven't taken it up to pressure yet and the barrel isn't broken in but right now I have a load that shoots .6 moa 5 shot groups with 12 fps ES and 4 SD at 2800 fps muzzle. 23 inch barrel no can.
I suspect after break in speed up and a can ill be close to 2900.

And like I said I havent pressure tested. I might find a node higher than what I'm at.
This is with 42.5 H4350. Blackjack reamer throated for 133 berger eh at 2.850 coal.

2900 should be the top node with the 133 and h4350 before it’s starts wrecking brass quickly.

I'm wondering how short of a barrel I can get away with and still get 3000 fps...would 17" finish be to risky? On the 25-7 prc

Maybe but I wouldn’t go any shorter than 18” you will be losing a lot of velocity per inch once you get below 22” with a 25-7prc.

 

[WKR]

Benchmark carbons are 14 months out...ouch
I keep looking at the medium length vesper but my gut is telling me go long...I guess I have time to decide on the action.

Maybe another vampire...

 

[ACHILLES]

7prc next to 135 berger at 3.260” Medium vesper is good for 3.4” That should be ideal even with the 145s.
I just ordered a steel Bartlein and they told me 6 months. But the wait for the carbons could be longer.

 

[WKR]

7prc next to 135 berger at 3.260” Medium vesper is good for 3.4” That should be ideal even with the 145s.
I just ordered a steel Bartlein and they told me 6 months. But the wait for the carbons could be longer.
View attachment 688959

Just got off the phone with Barry at Benchmark, put an order in for a Carbon .257 7 twist to be finished at 18". Will be awhile before I see it but thats all right.

Is that medium vesper a 2 lug 90° bolt throw?

 

[Mike D Texas]

I dont know man, thats alot of work fire forming get to a 25 saum improved. I think necking down a 7prc or 6.5 saum would be a much simpler process for the same or similar results. I just don't see the advantage of the improved saum being worth it.

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[sportsmans challenge]

@B23 And anyone else wondering. May be able to get 67 grains of n570 or more once fired into a adg 6.5 saum brass necked down to .257. Just need a fired case now.

(N570) just up to the neck shoulder junction

 

[ACHILLES]

Is that medium vesper a 2 lug 90° bolt throw?

Yes. At least you got the barrel ordered now

 

[Grundy53]

Where are you guys finding the 134 eldm's? I have a couple .25s at benchmark right now getting rebarreled with faster twist barrels so I can shoot them but I can't find them anywhere.

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[sportsmans challenge]

Where are you guys finding the 134 eldm's? I have a couple .25s at benchmark right now getting rebarreled with faster twist barrels so I can shoot them but I can't find them anywhere.

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I happened to find a few boxes local, but grabbed the last 2

 

[Grundy53]

I happened to find a few boxes local, but grabbed the last 2

Nice. I'm sure they will pop up eventually. I'm just impatient. Lol

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[762 ULTRAMAGA]

Benchmark carbons are 14 months out...ouch
I keep looking at the medium length vesper but my gut is telling me go long...I guess I have time to decide on the action.

Maybe another vampire...

If you haven't already check out their deep fluted steel barrels, at 18" a #5 will be super light

 

[Gear-Reviewer]

Where are you guys finding the 134 eldm's? I have a couple .25s at benchmark right now getting rebarreled with faster twist barrels so I can shoot them but I can't find them anywhere.

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Nowhere online has em now that I’ve seen. Hornady is running them again in May.

 

[willfrye027]

I'm trying to understand the benefit of a 257 over a 264, have you run the 134 eldm in your 25 creed? And if so what velocity are you getting
I have a 16" 6.5 saum and velocity with 147s is just under 2800 with H1000, RL26 is closer to 2900

134s I’m shooting at 2920 with H4350 from a 26” barrel. Max is 60-100fps higher with h4350. I don’t know that you could do that with a 6.5 creed and 140s..probably close and would need RL26 or something similar. The Berger’s have an even better BC and similar speeds.

I think it’s a slight edge over the 6.5 creedmoor overall and it’s something different.

 

[WKR]

If you haven't already check out their deep fluted steel barrels, at 18" a #5 will be super light

I want a carbon on this one...it'll be under 3 pounds. Its really just for looks and suppressor compatibility, but im okay with that.

 

[WKR]

Anyone here ordered a benchmark before?
Curious as to which groove you went with?
Does benchmark use 5r or conventional rifling?
And if I'm understanding this correctly 5r is just the angle of the grooves shoulder, so hypothetically i could get a 4 groove 5r rifled barrel.

 

[762 ULTRAMAGA]

134s I’m shooting at 2920 with H4350 from a 26” barrel. Max is 60-100fps higher with h4350. I don’t know that you could do that with a 6.5 creed and 140s..probably close and would need RL26 or something similar. The Berger’s have an even better BC and similar speeds.

I think it’s a slight edge over the 6.5 creedmoor overall and it’s something different.

I have to ask though, is 2920 where you got the best accuracy and SDs?
I can run my 6.5 creed beyond 2800 with 147 eldms and H4350, but accuracy and an SD of 4 is at 2700.

A 134 eld at 2900 drifts 1.71 mils at 1k in a 10mph L to R crosswind, impact velocity 1730
A 147 at 2700 drifts 1.76 mils with an impact velocity of 1662
That's with me reducing the 6.5 velocity significantly for optimal match shooting