What caliber to build

[bboswell]

That’s definitely a little beast of a rifle. I hadn’t even considered the 25-06 Ackley, and I’m not quite sure why. I’ve got a rifle with a Switchlug and a magnum bolt right now, as well as came across some more SAUM brass recently. I’m seriously considering building a 26” barreled 25 SAUM. That 131 at 3300-3350 would be impressive to say the least.

I see that match bullet, what are the results on game like?

[flyinstroke]

I see that match bullet, what are the results on game like?

Only neck shots with it last year. Will have some actual experience with it in a couple weeks. I have seen pics in the quarter bore Facebook group that have been pretty promising.


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[TX03RUBI]

Check out the new 257 Blackbird also. I know Crossroads Precision our of Victoria has a reamer. It’s a wildcat made by the guys at Black Jack


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Talking about the 257 Blackjack? Based on a SAUM case, but slightly shorter to feed from a SA mag? I’ve considered it for sure.

[flyinstroke]

Talking about the 257 Blackjack? Based on a SAUM case, but slightly shorter to feed from a SA mag? I’ve considered it for sure.

Taken from another forum from one of the BlackJack guys. I don't think its the 257 BlackJack but I could be wrong.


Gentlemen,

I have had quite a few customers want to run 257 WBY speeds but not run double-radius brass. The results of 257 WBY have been excellent with the 131 ACE but I understand their concerns and want to accommodate.

In this case capacity the easy options are 257-264 Win Mag (perhaps Arnold Magnum iirc - didn't see it mentioned in either of PO Ackley's books), the 257-7 WSM, and then perhaps one with a better brass option, a 257-7 Blaser or 250-7 Blaser for an easier to say name.

82.0 gr H2O case capacity new (84 fired) - practically identical to 257 WBY but should still yield 3400-3470+ fps in a decent barrel. The case is 0.200" shorter than a WBY case so this will work in magazines very well - the 257 WBY runs perfectly from LA Pmags with 131 ACEs anyway.

I've had the 131 ACE up to 3670 fps and did not have bullets come apart (340954 RPMs) but this was in a premium barrel from Blake Barrels so YMMV if you run the ACE that fast. At any rate 3400-3470 should be fast enough for most any use.

I earned 16th place of 191 competitors at the NF ELR Steel Challenge in Wyoming a few weeks ago (700-2091 yards) shooting against many magnum 7s, 30s, 338s, 375s, etc.

If someone is so inclined could you cook up this recipe in QL? 131 ACE (1.440") 1:8" twist with the usual suspects for powder.

I will probably order 6 reamers from JGS in a one-time project. Most of these rifles will be built as long range Mulie rifles and/or for the Nightforce ELR Match.

1593324014817.png

COAL = 3.300" - 0.126" FB - 0.275" BSL seated in neck - 0.042" clear of Neck-Shoulder junction.
--- Seated according to common preferred jump distances (0.005, 0.018, 0.035).
--- 3.295 COAL - 0.280" BSL in neck - 0.037" clear of NSJ.
--- 3.282 COAL - 0.293 BSL in neck - 0.024" clear of NSJ.
--- 3.265 COAL - 0.300 BSL in neck - 0.007" clear of NSJ.

or

COAL = 3.314" - 0.140 FB - 0.261" BSL seated in neck - 0.056 clear of Neck-Shoulder junction.
--- 3.309" - 0.266" BSL in neck - 0.051" clear of NSJ
--- 3.296" - 0.279" BSL in neck - 0.038" clear of NSJ
--- 3.279" - 0.296" BSL in neck - 0.021" clear of NSJ

Since the 131 ACE likes 0.005 off, 0.018" off, and 0.035" off both of these setups will work well with the brass, mags, bullet, and barrel life/chasing lands if end-user wanted to for the duration of the barrel wear.

1593364619725.png

---

Please share any experiences if you have used 7 Blaser brass or want to get on the list for 250-7 Blaser reamer.
Last edited: Jun 28, 2020
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[JohnWayne86]

don't build one somebody otta buy my built 6.5 creedmor. pm me for details and build list

[Tommyh]

That sounds like fun!

And a ****load of recoil 😳