Home Forums Hunting & Shooting Hunting Rifles 257 Weatherby

Does anyone have any good load data I can start from ? Wasting powder kinda gets old ( when there is not much in Texas right now )
Thanks in advance

Start with book data from the bullet you want to use and a chronograph.

What he said.

My 257wby gets 115gr bullets and IMR 7828. Makes 3350 with a 24” factory barrel. Planned on 100gr stuff, but the rifle hated the 100s I had on hand.

I have several books to choose from along with different grains bullets from 75-120 . Just was looking to see if anyone has had any luck with the Weatherby Firstlight 257

100 gr TTSX Barnes with H1000 is a good place to start. Not easy to find either though.

I’d be hunting for an 8# jug of 7828. It’s all I burn in mine after a bunch of experimenting with a range of powders. It works well for accuracy and high speeds with a range of bullet weights.

That would be my first choice and then Rel 22

I'm using 100 gr TTSX with R25 and having good results.

71.3gr of either RL-22 or MRP, F-215 primers, 100gr anything...

Jorge what is the coal on them loads ?

My personal opinion is to stay away from R22 and go with a temp insensitive powder like H1000. That and 100gr TTSX's. They don't mind a long jump. Load to book COAL or less.

RL-25 has proven itself with 115 Berger VLDs in several 257 Weatherby rifles I and my friends own. RL-33 is an option with 115 gr or heavier bullets.

100 gr. TTSX and RE 22 is the bomb.

After getting my custom 257wby, I tried IMR 7828 and liked it enough that I’ve never tried other powders.

Ramshot Magnum is another good choice for the 257Wby that's been more available than most of the Alliant and Hodgdon offerings.

My "go to" load in the 257 Weatherby Accumark is 100 gr. nosler partition over 73 gr. IMR 7828, federal 215m primers for +/- 3,650 fps.

ya!

GWB

jorge1 uses same load as myself , but i did go down to 70 grs. RL.22 and i like 100 gr. Nosler Patritions i get the same kind of groups as jorge 1 does I also like RL.25 too. 257 Weatherby mag. cartridge is my favorite big buck cartridge. good luck,Pete53 P.S. this year 2022 i am going to try Hammer bullets 25 cal. 103 gr. they sure are accurate on paper too and in stock too from Hammer bullets .com.

7828ssc was good for the Barnes 100 grain TTSX but had mixed results on game.
Switched to the 92 grain Hammers with great results at the range and one deer so far.
74 grains ,Fed Mag Rifle Primer @ 3828-3839fps and cover with a dime and I am a average shot at best.
I didnt experience pressure but didnt see a need to go farther.

That sounds like a killer load!

How’d the would channel look on your deer?

Photos are to big to post but found at least two exits from the designed fragments and a decent size exit.We were in a hurry and fighting daylight so didnt much time digging around.Think will work just fine.
Will have more info in the fall as we got drawn for Montana