257 Weatherby with 131gr Blackjacks?

Hoss50

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The website says 1:7.5 - 1:8 for magnums so I am hoping that I will be fine.

If not I will drop back to 121gr Hammers or my old friend the 115gr Berger.
 
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ihuntforchrist

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Oct 23, 2015
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I have a 1:7 twist McGowan and I used load data for the Sierra 117 spbt as a starting point. Everything seemed to line up pretty well, and the velocities were very close to the same. I eventually settled on using 7977
 

flyinstroke

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I have emailed them multiple time while working on my 25-06AI and always gotten a response. I have a finnicky barrel and for some reason it did not like H1000 of Retumbo. Finally found some luck with H4350. Its not the speeds I want its accurate and pretty close. I used the data from the Sierra 120. If I remember correctly BlackJack said the bearing surface was almost the same and I could try the powders recommended for that bullet. Thats how I ended up with H4350

I don't facebook. I did email blackjack awhile back asking for starting data, but they never replied. I assume for liability reasons.
 

Hoss50

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I have emailed them multiple time while working on my 25-06AI and always gotten a response. I have a finnicky barrel and for some reason it did not like H1000 of Retumbo. Finally found some luck with H4350. Its not the speeds I want its accurate and pretty close. I used the data from the Sierra 120. If I remember correctly BlackJack said the bearing surface was almost the same and I could try the powders recommended for that bullet. Thats how I ended up with H4350
I emailed them again last night. I will see if I get anything back this time.
 

cape cove

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In my 257 Vanguard I get the best combination of accuracy and velocity with RL-22. I've used many different slow burners like RL-26, RL-33, MRP, Retumbo, etc but always came back to RL-22. I've gotten my highest velocity with RL-33 (3389 ft/sec- 24" barrel)) with 117-120 gr bullets but just couldn't get the accuracy I was looking for. The load was also fairly compressed which I'm not crazy about. JME
 

Left Hand Dave

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I emailed them again last night. I will see if I get anything back this time.
You might want to call. I had problems making contact via email. Phone seemed to work better. They both have full time jobs and a phone let’s you know someone is looking for you.
 

ml williford

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Jan 18, 2005
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Has anyone loaded this combo yet, and what worked for you? I am going to try some soon hopefully and I want to start tracking down the right powder for the load.

My 1:8" twist barrel arrived earlier this week. Once it is fitted it will be time to burn some powder.
I've been thinking abt buying the 257 but have a 25-06 already. Wanted to ask if you have an opinion on the difference between them? And would it be worth buying. Going to use it on hogs at night mostly.
 

Hoss50

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I've been thinking abt buying the 257 but have a 25-06 already. Wanted to ask if you have an opinion on the difference between them? And would it be worth buying. Going to use it on hogs at night mostly.
I wouldn't say it is worth the extra velocity to go weatherby if you al ready have that. A 25-06 or 25-06AI will move bullets along plenty well. The weatherby will burn barrels faster and burn more powder. If this rifle wasn't setup on a magnum bolt face I would probably have built a 25-06AI or 6.5-06.

Don't get me wrong, I love my 257 weatherby, but your rifle will get it done. You are having the same debate I had when I chose this. I almost built this rifle in 264 Win Mag instead of 257 Roy, but I already have a 6.5x55. They both shoot 264 caliber bullets, and my 6.5x55 will do just about anything I need. Making a 264 Win Mag would have been cool, but would not have served me as well IMO.
 

Hoss50

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One last bump. Has anyone loaded this yet? Blackjack gave me a few starting loads, but none with H1000. They really like Rl26, but good luck getting ahold of some. I have 1/2 lb., but dont want to develop a load, then have no more powder left.
 

highdrum

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One last bump. Has anyone loaded this yet? Blackjack gave me a few starting loads, but none with H1000. They really like Rl26, but good luck getting ahold of some. I have 1/2 lb., but dont want to develop a load, then have no more powder left.
You're going to be best off with Retumbo, IMR8133, RL33, N570, H50BMG. That's an 86gr capacity case and a small bore size, slower will be your friend unless you want a poor case fill %. I just ordered an 8 twist barrel myself. Either going to do a 257 wby or Miles' new 25-7 blaser, it has 84gr capacity 30° shoulder 0.320" neck and will be around 3.34" coal.
 

BigDon

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Oct 2, 2018
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Cheyenne, Wy
You're going to be best off with Retumbo, IMR8133, RL33, N570, H50BMG. That's an 86gr capacity case and a small bore size, slower will be your friend unless you want a poor case fill %. I just ordered an 8 twist barrel myself. Either going to do a 257 wby or Miles' new 25-7 blaser, it has 84gr capacity 30° shoulder 0.320" neck and will be around 3.34" coal.
I’d like to know more about that 25-7 Blaser. Googled and found nothing. Can you point me in the right direction?
 

highdrum

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I’d like to know more about that 25-7 Blaser. Googled and found nothing. Can you point me in the right direction?
Facebook unfortunately, I'll dig up some info for you. That's an image of the parent case, essentially a 7 saum stretched about 0.330" the long neck only requires 0.126" to keep bearing surface above neck/shoulder junction at all times.
 

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