25 caliber what caliber can i find best accuracy with in a 10.5 twist barrel

[Beruisis]

I have two 25 Creedmoors; one is a 10 twist & shoots the 100gr Barnes TTSX into one hole consistently.
I used to shoot the 250 Savage & have about 150 pcs of once fired brass if you decide to go that route.

 

[david12601]

257 Ackley 40 degree

 

[wildcatter]

I have had great results with both 250 Savage and 257 Roberts. Both show obvious improvements in the AI versions.

But today, BRASS, trumps. I made my last cases using 8x57 Lapua brass, he'll for strong, and my batch was some of the most consistent cases I've used in some time.

But since I cannot find anymore, and for me Quality brass trumps. Today if I was building a new cartridge in 25 cal. I would turn to the 6.5x47 Lapua case. The 25x47L would be where I would center my efforts today. It as as good a brass as we can hope for today, and available.

 

[Infrequent Shooter]

I have two 25 Creedmoors; one is a 10 twist & shoots the 100gr Barnes TTSX into one hole consistently.
I used to shoot the 250 Savage & have about 150 pcs of once fired brass if you decide to go that route.

Beruisis, do you mind giving details and maybe a pic of your 25CM? Sounds like a great combination.

 

[Beruisis]

Beruisis, do you mind giving details and maybe a pic of your 25CM? Sounds like a great combination.

Medium contour 24" Lilja 10 T barrel, Rem action. McMillan stock, Leupold VXR 4-12x.
Load is 250 Savage Hornady brass fireformed (this was before availavble 25C brass), BR2 primer & 42,0 grs H4350, 100 gr Barnes TTSX. I can get a pic & measured velocities this weekend.
Beruisis

 

[Infrequent Shooter]

Medium contour 24" Lilja 10 T barrel, Rem action. McMillan stock, Leupold VXR 4-12x.
Load is 250 Savage Hornady brass fireformed (this was before availavble 25C brass), BR2 primer & 42,0 grs H4350, 100 gr Barnes TTSX. I can get a pic & measured velocities this weekend.
Beruisis

Great, don't let that one get away!

 

[Beruisis]

Great, don't let that one get away!

Not great pics, the top one is the 10 T Lilja.
Bottom one is 7.5 T Bartlein.

 

[Infrequent Shooter]

Not great pics, the top one is the 10 T Lilja.
Bottom one is 7.5 T Bartlein.

lookin' good

 

[Cloudrepair]

Once the MV & twist rate produce > Sg 1.4, increasing the velocity isn't worth consideration - "it's all about" twist rate: bullet length. For practical application, using Std conditions and MV above 2K FPS will let us know if we are using an adequate twist rate. Based upon 35 years of "testing*" the math - for the last 20+ years, I have never purchased a barrel which will produce less than Sg1.4 at Std (sea-level) conditions - form there, it only gets better.
For example: a 68 gr. FB 6mm bullet, via 1:14" twist:
1) 2000 FPS MV - Sg 1.298
2) 3000 FPS MV - Sg 1.358
Very marginally better - now, if we begin with MV at about 3K and above, Sg increase with velocity is considerably lower - nearly [only] 50% gain for 1K FPS. The same bullet @ 3K = 1.359 (2 above), jacked-up to 4,000 FPS MV, Sg 1.390. Changing the caliber/weight won't alter the relativity . . . just the numbers.
RG

*When it comes to making "cup-and-core" bullets, if you can imagine it, I have probably invested the time and $$$ in doing/exploring IT, and learning/confirming the "rocket science".

20 years ago I looked seriously at the 257 Kimber. 204 Ruger brass just became available and I realized it was nearly a clone of the Kimber and could be made into the 25-204 with just necking up and no serious case forming involved. I built the 25-204 in 2005 and have been very happy with it since. 100gr bullets at 2850 fps have worked great on deer and 75s at 3150 do a number on coyotes. Next month I'll be hunting javelina with 85gr NBTs with it.

If I were to do it today I'd look seriously at doing it on the Grendel case and building on one of the mini-actions what a neat little hunting rifles that would make.

Will a Grendel casework in a standard bolt face (308)? Maybe dumb question I should know the answer to. Maybe a little to sloppy with .025 clearance?

 

[SteveOak]

While I am not a fan of 25 cal, if I was looking for best accuracy in that caliber I would go with 25 BR?

Handy link to AS thread

Berger makes several bullets for 25 cal.

 

[wildcatter]

I would like to see how a 25x47 Lapua would do. I think it would be incredibly efficient with 100 grain bullets?

 

[searcher]

I'll admit, i never really gave elevation a thought when choosing a cartridge.
But then I'm at 1,600ft ASL.

All my rifles are geared towards hunting.

Savage Axis II in 250 Savage wearing an E.R. Shaw 24" sporter barrel.
This is primarily my coyote rifle, though i have taken 2 deer with it.
Normally shoot 75gr Sierra HP Varmint and 90gr Sierra BlitzKing.
Deer was 100gr Nosler Ballistic Tips. And i have shot the 115gr Berger VLD.

Ruger 77 MKII in 257 Roberts.
I shoot everything from the 75gr HP through the 120gr Sierra HPBT GameKings.

Savage 111 in 257 Roberts AI.
Normally I shoot 100gr through 120gr bullets in it.

Browning A Bolt SSA in 25 WSSM.
100gr through 120gr bullets.

Ruger 77 MKII in 25-06.
115gr-120gr bullets. The 115gr Berger VLD and Nosler Ballistic Tips work great in this!

Weatherby Mark V Ultra Lightweight in 257 WBY Mag.
115gr- 120gr bullets in this hotrod!
I have some 120gr Blackhole ULD bullets on order to try in this.

Lots of chamberings to look at!
Each has it's good and bad.
As mentioned, the 25-47, 25BR, 25-284, 25-350 Rem Mag are other options also.

I have an unfired 26" Shilen HV for a small shank Savage, chambered in 250 Savage, I'm going to be selling.

You are truly a .25 fan! Good lineup.

 

[Infrequent Shooter]

Kimber had a proprietary cartridge made for one of their rifles some years ago.
257 Kimber.
Based on the 222 Rem Mag case, it was necked to 25 caliber, then fire formed pushing the shoulder forward.
Goal was to duplicate 250 Savage performance with the small action that they had.

Don't forget the 25-45 Sharps!!

With my 257 Roberts AI, i've found it to be just as accurate as my standard 257 Roberts when fire forming.

Side note, all my 257 Roberts and AI are formed from 7X57 Mauser casings.

how accurate can you get your 257R or 257AI to shoot?

 

[std7mag]

This is my Savage Axis II in 250 Savage at 200 meters.
Both the 257 Roberts and AI are about on the same level.
Just faster velocities.

 

[Infrequent Shooter]

This is my Savage Axis II in 250 Savage at 200 meters.
Both the 257 Roberts and AI are about on the same level.
Just faster velocities.

excellent

 

[ISS]

Common Sense: 25-284. Uses a short action, gives 25-06 velocities +/-, brass is plentiful. Lots of 6.5-284 Lapua brass out there...

 

[Grit338]

Take alpha 6bra brass neck it up to 25cal. you can build off 7.5 to 10 twist an shoot 100gr to 135gr n135 will get you 2725 with 135 Berger 26” an you can almost reach 25-06 speeds with the 100-115 in the 10 twist works just as well in the 7.5 twist. I took it a step farther won’t get into details. Also n140 an n150, Varget do well. Great accuracy as well! Just have to build a reamer get a 284-287 neck just depending on what you won’t need lots of freebore, mine has .201”you don’t need that much unless you like to jump the heavy’s .works great from 101gr Barnes to 115 Berger but is throuted for the 135’s.
But a 25 creedmoor will get you 3200 out of a 115 Berger with h4350 just be safe working that load up it’s an unbelievable varmint slash deer round. Good luck

 

[JLT]

Take alpha 6bra brass neck it up to 25cal. you can build off 7.5 to 10 twist an shoot 100gr to 135gr n135 will get you 2725 with 135 Berger 26” an you can almost reach 25-06 speeds with the 100-115 in the 10 twist works just as well in the 7.5 twist. I took it a step farther won’t get into details. Also n140 an n150, Varget do well. Great accuracy as well! Just have to build a reamer get a 284-287 neck just depending on what you won’t need lots of freebore, mine has .201”you don’t need that much unless you like to jump the heavy’s .works great from 101gr Barnes to 115 Berger but is throuted for the 135’s.
But a 25 creedmoor will get you 3200 out of a 115 Berger with h4350 just be safe working that load up it’s an unbelievable varmint slash deer round. Good luck

" . . . almost reach .25-'06 speeds with the 100-115 in the 10 twist works just as well in the 7.5 twist."

What is "almost" in this context? How is that remotely possible within the bounds of sane pressures, when the BRA case has about half the capacity of a .25-'06? I'm just thinking some fellow will try and get 3,550 fps out of a .25 BRA because he comes across something like this. The best outcomes would be blown primers or a locked-up bolt. The worst is far worse.

With a 100 gr. bullet, you can get that velocity safely and easily out of a .25-'06. Not possible with the BRA case. Not safely, anyway.

 

[Grit338]

I did say I took it a step father if you must know I blow shoulder out about .050” farther very close to a 6brxd just 25 cal an yes 25-06 speed are possible to get in 100-115 not a problem but yes be safe, where talking 3000 fps 115 Berger, an ever BR case runs off a lot of pressure. I’ve built several guns like this an some did get pressure, don’t run to fast of a twist best is 4 or 5 grove 8 twist gets speed up an less pressure, you may be able to understand this if you look at dasher speeds with comparable bullet grain an understanding that 25 gives you a slightly larger area for the powder to escape an allows for faster powder! If people are trying to get 3500 out of a 25-06 they lost there minds with a 100-115 where talking normal speeds around 3000 fps with 115 an 3150 with 100gr. this is a case I developed I’ve got 1000’s of rounds of load data, I’ll never build anything other than a 25 cm or this 25 bra modified it get everything you need from 70gr to 135gr for anything you won’t to do. And yes you can just keep it a standard 25 bra a get a lot out of it!

 

[JLT]

I did say I took it a step father if you must know I blow shoulder out about .050” farther very close to a 6brxd just 25 cal an yes 25-06 speed are possible to get in 100-115 not a problem but yes be safe, where talking 3000 fps 115 Berger, an ever BR case runs off a lot of pressure. I’ve built several guns like this an some did get pressure, don’t run to fast of a twist best is 4 or 5 grove 8 twist gets speed up an less pressure, you may be able to understand this if you look at dasher speeds with comparable bullet grain an understanding that 25 gives you a slightly larger area for the powder to escape an allows for faster powder! If people are trying to get 3500 out of a 25-06 they lost there minds with a 100-115 where talking normal speeds around 3000 fps with 115 an 3150 with 100gr. this is a case I developed I’ve got 1000’s of rounds of load data, I’ll never build anything other than a 25 cm or this 25 bra modified it get everything you need from 70gr to 135gr for anything you won’t to do. And yes you can just keep it a standard 25 bra a get a lot out of it!

Physics does not agree with you. Specifically, Boyle's Law.

The .25-'06 is has a rated maximum pressure of 63,000 psi. The parent case of all that you mention is the 6mm BR Norma, which is rated at 58,000 psi.

How can it be that lower maximum pressure and half the capacity can result in roughly the same velocity? I you're running 115s at 3,000, you're likely running 70K psi or thereabouts. Loaded to equal pressures with the same bore and bullet, there is absolutely no way a case the size of a BRDX can run with a case the size of an '06.

I have several loads developed for my .25-'06 that are safe in my rifle and will drive a 100 gr. Speer BTSP over 3,500 fps. I can get 115s north of 3,200 without a lot of fuss and bother. You cannot do either safely with a BR-based case.

The Dasher comparison falls short. Most Dasher loads around 3,000 fps with a 105 are producing pressure in the upper 60s, if not 70K psi. The case you're working with is smaller. I've been shooting a Dasher in competition for quite some time. I know that case very well. You're talking apples and oranges.

I'm not arguing to be right. I'm begging you to be safe, before something bad happens.