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Looked around a bit and didn’t see any load data for the .257 Weatherby. I’ve got one coming in and not sure where to start. Looking for loads mainly for whitetail.

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100 grain TTSX is the bullet of choice for many. Easy to get to shoot, lightning fast and deadly.

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Thank you….what powders are best?

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I really like H1000 and highly recommend temperature stable powders. R22 and R25 work well, but watch the heat!


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I load 110 Accubonds for mine. I use IMR 4350

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I have a bunch of RE-22 and Maybe I’ll try and find some H-1000 to try.

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Originally Posted by ChanceD
Thank you….what powders are best?

My brother had a good load running with Rl 22, seems that I remember h1000 being a good choice but that is going off of memory. I have not loaded for it yet, but it will be this summer. Keep us posted.

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have had the best accuracy in a hunting bullet in 100 grain with either 100 gr. Nosler Partiton or Swift A-Frames and they do kill bigger Whitetail and Mule bucks excellent , with my 257 Weatherby mags. for many years. Reloader 22 and 25 have worked just fine in the fall for hunting in my rifles.


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Fill case with 7828, cork with 100gr bullet of your choice, watch deer wilt. 85s can be dramatic killers too.

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I too would suggest 7828. RL 22 as a second option.


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I’ve mainly used 7828 and H1000, but RL22 is a favorite of many. My current 24” rifle likes the 115NPT with 7828 at 3,350fps. The 100gr version seems like the best fit here, but I had the heavier bullet already on hand.


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Originally Posted by ChanceD
Looked around a bit and didn’t see any load data for the .257 Weatherby. I’ve got one coming in and not sure where to start. Looking for loads mainly for whitetail.
Id buy a few reloading books!!!!!

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Originally Posted by ChanceD
I have a bunch of RE-22 and Maybe I’ll try and find some H-1000 to try.


R22 and the 100TSX was my go-to in the .257 Weatherby.


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I have an old 1954 12 twist FN 257 Mag, it loves 100gr A Frames and TTSX's with blue tips removed, the load is an easy 3500 fps with 65gr Norma 204 powder, that modest powder charge is easy on the throat, keeps barrel heat down and doesn't have near the muzzle blast as buds 257 Mag. using 80gr in his loads with another powder, i have only shot three or four deer and pigs with that rifle, they will melt before your eyes, next to no recoil lets you stay in the glass and see it all.


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Currently toying around with mine with rl26 and 110gr Sierra TGK. It shows some promise but there’s not a lot of rl26 data out there. Sierra states some in their newest manual but that bullet hadn’t quite hit the market yet I don’t guess. With the generous freebore weatherbys have do you guys that have a lot of experience loading them find pressure signs then back down some? Whats the method to you fellas’ madness?

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Great choice of cartridge. I've owned and loaded for a gaggle of 257's. I much prefer the heavier bullets as they buck the wind and don't run out of steam as fast as the lighter bullets. My go to powder is RL-25 with a 115 NBT. It has consistently provided the best combination of accuracy and speed across the range of 257's I've loaded for. Additionally, I've found the 115 NBT to hold up well at 257 Wby velocities. My second choice would be H-1000 coupled with a 110 AB. Also consistently accurate and fast. As an aside though, I have found the 110 AB to quickly pressure spike when at or very close to max. Nothing terribly significant though. Just approach the upper end with caution.

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for the guys that use H-1000 what kind of velocities are you getting , i never seem to get as fast of velocities as i do with Rl. 22 example 100 N.P. RL 22 3700 -3800 fps? i have also notice RL. 25 does shoot nice rounded groups too. anyone using Hammer bullets now ? i just got my Weatherby mark 5 finished with a bedding job i put a Brux barrel contour 4 ,7 1/2 twist , 28 inch long , chambered in a 257 Weatherby mag. with my reamer. so i will now be gettin it ready for out west on a antelope hunt . wanna use the heavier grain 25 caliber bullets in this new rifle build so that`s why i ask these questions. would like too use either Berger 135 gr. ,B.J. bullets or Hammer bullets , probably RL. 22 or RL. 25 but if H-1000 works i might use that too ? thanks,Pete53

Last edited by pete53; 07/09/22.

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Five of us use RL-25 or RL-33 with the 115 Berger. Either one makes them scream.

As for load data:

Nosler:
https://www.nosler.com/load-data/caliber-and-cartridge-data.html

Hodgdon:
https://www.hodgdonreloading.com/

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I have always used RE22, CCI mag primers and 100 gr. TTSX at 3700 fps. Have killed a pile of critters, elk, deer, antelope and all DRT. Punches WAY over its weight limit.


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Originally Posted by EJKELLEY
Originally Posted by ChanceD
Looked around a bit and didn’t see any load data for the .257 Weatherby. I’ve got one coming in and not sure where to start. Looking for loads mainly for whitetail.
Id buy a few reloading books!!!!!
Thanks for the comment, I have several reloading books but I thought I'd ask for some pet loads here first. I'm a very experienced reloader for many years, but I just thought I'd ask the good people here first.

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