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 Post subject: 257 WBY
PostPosted: Tue Apr 16, 2019 6:06 pm 

Joined: Thu Mar 23, 2017 7:04 pm
Posts: 140
Location: WI
Part 2 of my afternoon. I also took my 257 WBY along today and worked with Hornady 120gr HP , Alliant RL-33 Federal 210 , Winchester Brass (formed from 7mm Rem Mag) seated at 3.300” I worked from 79.8gr to 81.0gr as follows
79.8 =3342 fps
80.0 = 3306
80.2 = 3342
80.4 = 3355
80.6 = 3364
80.8 = 3372
81.0 = 3372
I also loaded 3@78.5 , 79.5 , 80.4 for groups
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I think I’ll work around 80.9gr and see what comes of it.
81gr would be high as I go , starting to get cratering , a couple of weeks ago I tested up to 81.5gr by 1/2gr at a time and stop speed was ridiculous for a 24” barrel.
Again this is not WEATHERBY 257 Brass so anyone thinking of trying RL-33 needs to start WAY lower


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