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Reloading Berger Bullets


257 weatherby mag

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Unread 04-12-2013, 12:19 AM
Gold Member
Join Date: Feb 2008
Location: Utah
Posts: 596
Re: 257 weatherby mag

I use to have a 257 weatherby and it was a fun rifle to shoot but it seemed to picky for me. I was getting around to tring Rl25 but never did. If you search the site there was a good read on RL25 and the 110 or 115's. My best and tightest load was 7828ssc but when the temp when up the load went south. It went from 3 shots toughing at 100 to about .8inch group as the temp got above 60 degrees. I was loading max. Probablly H1000 will be the most consistant in the rifle or was the most consistant in mine. But I sold mine off to get a 6.5x284. For as hunting I remember taken an antelope at 258yrds with the weatherby 115 blastic tips and it smoke her in her tracks. Not a lot of meat loss. I took another at 400yrds same bullet and this time the bullet went all the way through but left about a 50cal hole on the other side. I must say it was probablly the best shot I've ever made because it played out like slow motion in the scope. I seen the impact ripple on the goat and the blood start coming out. Lope spunn over backwards and did a flip. I only shot the 110's and the 115's but not very many of the 110's. The heavier the bullets the less wind drift. Something to think about. I would think if RL25 would work retumbo will also work as well. my 2cents.
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Unread 04-12-2013, 06:05 AM
Platinum Member
Join Date: Dec 2005
Location: Tucson Az
Posts: 2,063
Re: 257 weatherby mag

four of us have used RL-25 with the 115 Bergers. My 28" 257 3 groove became quite rough and began destroying the 115 VLDs at round count 600. Switched to moly coated 110 Accubond. Also used RL-25.

Then RL-33 came out....switched and discovered that I could get more velocity over RL-25.

Original load with moly 110 accubond: 75.5 gr of RL-25 vel 3615 fps


80 gr 3432 fps
81 gr 3525
82 gr 3559
83 3625 which slightly faster than old load with RL-25
83.5 3674 fps shot well two shots were same velocity
84 gr 3704 fps shot well two shots were same velocity
84.5 gr 3735 slight signs of pressure on one case of four this is max case capacity with drop tube

Settled on 83.5 gr for new load.
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Unread 04-12-2013, 07:34 AM
Gold Member
Join Date: Feb 2012
Posts: 991
Re: 257 weatherby mag

CDL does its absolute best with a sierra flat based pro hunter and 7828 and a fed match primer. About unbelievably the second best load in that gun is the exact same load with nosler 100 grain ballistic tips. Ive killed at least 2 doz deer with each of those loads and one does as well as the other and neither have left me wanting. They kill deer like the hammer of thor.
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Unread 04-13-2013, 01:34 AM
Silver Member
Join Date: Jun 2005
Posts: 172
Re: 257 weatherby mag

IMR 7828, RL22, RL25, H1000 in that order. IMR 7828 seems to perform in the weatherby case.
I'm assuming your going to shoot 100gr and heavier bullets
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Unread 04-13-2013, 01:20 PM
Platinum Member
Join Date: Oct 2008
Location: Alabama
Posts: 9,995
Re: 257 weatherby mag

I have been wanting to try 25 for my .257 Wby and my 7mmSTW, but I can't seem to get my hands on any.
"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger

"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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Unread 12-21-2013, 03:15 PM
Silver Member
Join Date: Dec 2013
Posts: 118
Re: 257 weatherby mag

70 gr of h1000 pushing a 117 sst at 3100fps gives me 5/8'' groups at a 100 yards in a vanguard!
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