257 caliber question

[Gibbshooter43]

Forgive me if I'm asking a previously asked and answered question, but I haven't found one addressing this topic in my search so here goes. I'm a big quarter bore fan. I've owned the 257 Roberts, and currently have a 250 Savage; a 250 Savage AI; a varmit barreled 25:06; and a sportier 25:06 AI. I've been looking at another 257 Roberts, but I'm seeing some information about a 25cm. My research has been sketchy and it seems to be known by different names. So I turn to where I always turn - to those who know best and can provide the most relevant and detailed answers. Who has or has shot one and where does it fit in the 257 caliber family.

 

[bodean87]

The guy with ,I think, blackjack bullets is who you need to talk to. He's done alot of work with it.

 

[26Reload]

I havent....but in relative form...id say much less that the 2506...more than the Roberts.....
I bet it would be an excellent varmint rifle, antelope and deer(lightly)...

 

[Gibbshooter43]

What's my best contact with "the guy from black jack bullets"?

 

[26Reload]

Just put on here you want a thousand blackjack bullets and I bet he chimes in quickly.......sales.....

 

[Barrelnut]

Try this: [email protected]
Website: https://blackjackbullets.com
They can help with reamers and barrels.

The bullets are 131 Gr. and require a 1:7.25 twist .257 barrel.
I think one in a 25-06AI would be pretty awesome antelope/deer rifle.

 

[AZShooter]

I have not shot a 25 creedmoor. One way to gauge potential is with case capacity.


I would suggest the 25 creedmoor ( case capacity of 52.5 gr of water) with same pressures will have slightly less velocity than the 25-243 sometimes called the 25 super (54 gr of water)

The 257 Roberts 56 gr of water, 250 savage 46 gr of water.

I have owned a 25-284 which is easy to form from 6.5-284 brass. It has a 35 degree shoulder and minimum body taper and should duplicate performance of a 25-06 with both holding 66 gr of water.

Why not go all the way and own a 257 Weatherby? 88 gr of water.

 

[AZShooter]

I have not shot a 25 creedmoor. One way to gauge potential is with case capacity.


I would suggest the 25 creedmoor ( case capacity of 52.5 gr of water) with same pressures will have slightly less velocity than the 25-243 sometimes called the 25 super (54 gr of water)

The 257 Roberts 56 gr of water, 250 savage 46 gr of water.

I have owned a 25-284 which is easy to form from 6.5-284 brass. It has a 35 degree shoulder and minimum body taper and should duplicate performance of a 25-06 with both holding 66 gr of water.

Why not go all the way and own a 257 Weatherby? 84 gr of water.

 

[lancetkenyon]

I have/had a few quarter bores too. .250-3000 Savage, .250AI, .25-06 Rem, .25-06AI, and I have a 25SST that should be ready any day, maybe even today.
A 25 Creedmoor is comparable to the .250AI in case capacity and velocity.
I used to push a 115 Berger @ 3050 in my 23" .250AI. I can push a 115 Berger @ 3065 in my 6CM if I lean on it. I would bet a 131 Blackjack could run 2850ish in a 25 CM, I get 2888 w. 130 OTM in my 22" barrel 6.5SLR and 2850 in a 24" 6.5CM.
The benefit to a 25 Creedmoor is you can get headstamped brass to match your barrel markings. A plus if you hunt out of the country, like Mexico or Canada. Other than that, no gain over what you have.
If you want a suggestion, rebarrel your .25-06AI to a 1:7.5" and run the 131 Blackjack to really push the HP. Or for a SA, build something like a 25SST.

 

[357Mag]

Gibb -

Howdy !

Review of each case' spec's shows that the .250 Ackley improved has a 40* shoulder angle and nominal .455" shoulder diam.

A notional .250 Creedmoor would have a 30* shoulder angle and around the same shoulder diam as what the .250AI has.

The .25 Creedmoor ( I believe ) would have a slightly longer base-to-shoulder dimension than what the .250AI has.

Tthe powder storage area covered by the .25 Creedmoor would be slightly larger than that seen on the .250AI ( owing to the former's shallower shoulder angle ).
That fact added to the .25 Creedmoor's slightly longer base-to-shoulder dimension would result in it having a tad more case capacity that the .250AI ( IMHO ).

Case oal's are very close.

Brass preference would possibly bias one's decision ....one way or the other.


With regards,
357Mag

 

[Quintus]

Yep, not really gonna do anything the Bob won't. It would be the 25-08, but because of the Bob they never went that route. The 25x284 is a dandy, but again with a 25-06...

 

[Gibbshooter43]

I have/had a few quarter bores too. .250-3000 Savage, .250AI, .25-06 Rem, .25-06AI, and I have a 25SST that should be ready any day, maybe even today.
A 25 Creedmoor is comparable to the .250AI in case capacity and velocity.
I used to push a 115 Berger @ 3050 in my 23" .250AI. I can push a 115 Berger @ 3065 in my 6CM if I lean on it. I would bet a 131 Blackjack could run 2850ish in a 25 CM, I get 2888 w. 130 OTM in my 22" barrel 6.5SLR and 2850 in a 24" 6.5CM.
The benefit to a 25 Creedmoor is you can get headstamped brass to match your barrel markings. A plus if you hunt out of the country, like Mexico or Canada. Other than that, no gain over what you have.
If you want a suggestion, rebarrel your .25-06AI to a 1:7.5" and run the 131 Blackjack to really push the HP. Or for a SA, build something like a 25SST.

I've been considering the rebatreling idea with one of my 25:06's to go with the 7.5 twist. Thanks.

 

[Gibbshooter43]

Thanks to all for your input so far. I've even been considering a 257 Roberts AI. So many possibilities compared to the time available to shoot 'em all.

 

[Gibbshooter43]

Companion question: does the Hammer Hunter require the 7.5 twist or will it perform adequately with the 1:10 twist?