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257 weatherby mag

 
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  #1  
Old 12-18-2011, 11:33 AM
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257 weatherby mag

Looking for some load ideas for my 257 weatherby. Asked around a bit and most say that they can not duplicate factory loadings no matter how hard they try. I shoot 100gr factory ammo now and yes it's fast but i am not enamored with the accuracy. Let me know what you think.
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  #2  
Old 12-18-2011, 02:05 PM
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Re: 257 weatherby mag

I get over 3800 fps with magpro and a 100 grain ttsx. Have shot 2 1/2" GROUPS AT 620 YARDS. 1 1/2" AT 400 YARDS REGULARLY. caps lock off now. Magpro does well with this size case. Mine is a mk5 wby 26" barrel.
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  #3  
Old 12-18-2011, 09:38 PM
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Re: 257 weatherby mag

all the 100gr that i have shot are the non-tipped version factory loadings. i shot them through my friends chrono and they are actually faster than advertised. i go some RL22 and some 115gr balistic tips. i am going to try those soon. my rifle is a remington 700 LS. I have heard mixed reviews on the weatherby's in a 700 action.
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Old 12-19-2011, 10:13 PM
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Re: 257 weatherby mag

I have the same rifle as you remington 700 lss mountain rifle, have run 100grn nbt's at 3800 and some change with 75.5grns RE25, start much lower, retumbo works well with 115s and high neck tension 3500+, be careful with that rifle, it can be finicky.
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  #5  
Old 12-21-2011, 08:44 PM
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Re: 257 weatherby mag

Quote:
Originally Posted by backwoods83 View Post
I have the same rifle as you remington 700 lss mountain rifle, have run 100grn nbt's at 3800 and some change with 75.5grns RE25, start much lower, retumbo works well with 115s and high neck tension 3500+, be careful with that rifle, it can be finicky.
what length do you load to? i have been hearing some hubub about weatherby and excessive free bore to get the extra velocity? not sure about any of that but i am going to start load development soon. so i was just curious what your overall was with 115's.
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  #6  
Old 12-21-2011, 08:50 PM
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Re: 257 weatherby mag

3.265" start at about 69grns with retumbo or 68 with RE25, use CCI 250s to keep the ES down.
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  #7  
Old 12-23-2011, 09:53 AM
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Re: 257 weatherby mag

This was quite a few years ago. One of my friends got a Weatherby MKV in 257 WBM and could not get it to shoot as well as he thought it should. He sent a letter with targets and load data to Weatherby and the reply that he got came on a post card. "Weatherby makes a hunting rifle not a target rifle". The old H-870 that is no longer made was the go to powder for many that I knew of that used the 257 WBM. Retumbo should work well because it does in my 264 Win Mag and H-870 used to be the go to powder for it.
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