.257 stw ?

I have an aquatints that has one of these but don't know what powder he is using. One thing I do know is you have picked the right bullets. He could not get any of the cup and core bullets to hold together for him they just slung themselves apart. The 100 tsx is what he ended up using. Killed deer so far across a bean field I could not believe it.
 
I agree with just country on going with Ramshot. Friend of mine has a 25 STW and encountered powder bringing with other powders. These things are fast!
 
Quick look on net showed these links for loading the 257 STW

https://web.archive.org/web/20170619215954/http://reloadersnest.com/frontpage.asp?CaliberID=239

This from Loaddata.com

257 STW Load Data Reloading Data
Printable Version
Warning! Notes: All powder charges are maximum and should be reduced by 12 percent for starting loads. Cases formed by necking down Remington 7mm STW brass. All rifles had 26-inch barrels. (Layne Simpson data)
Be Alert: Publisher cannot be responsible for errors in published load data.
Wt. Bullet Powder Manufacturer Powder Charge Velocity (FPS)
75 Hornady HP Alliant RL-22 85.0 4036
85 Nosler Ballistic Tip Alliant RL-22 83.0 3914
100 Nosler Partition Hodgdon H-1000 86.0 3709
115 Nosler Ballistic Tip Accurate AAC-8700 92.0 3546
117 Sierra SBT Accurate AAC-8700 89.0 3507
120 Nosler Partition Hodgdon H-1000 82.0 3466
 
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Contact Steve at Hammer Bullets. He usually has load data using their bullets. Should be exactly what you are looking for. I have not personally used any yet but as soon as my rifle is done it will be getting a steady diet of Hammer pills.
 
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