.257 Roberts

[onlybrowning]

I posted on another forum, thinking there might not be much love for the .257 Roberts here, but a recent thread has me thinking there’s some interest in it, so here goes:

I am loading for a Browning A Bolt in .257 Roberts. I had some factory HSM 117 Bergers that would not shoot well at all. Bad enough that I changed the scope because I was convinced it couldn’t be that bad.

I’m hoping to find a load it likes and I’m looking for some insight. I’ve got some 100gr Speer Hot Cors and a pile of Nosler 115gr Ballistic Tips.

I’ve got Varget, H4350, H4831sc…

Load data is all over the place. My old Lyman book says Varget is best, but the interwebs says H4350. Hodgson’s website only lists h4831.

What gives?


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[Xxtavixx]

Its really more a pursuit to find what your rifle likes. Use what you have on hand and can get.

For me, Id use h4350 > h4831.

Also, I havent owned a 257 roberts but my buddy uses one. Awesome deer and hog gun.

 

[sierracharlie338]

I had fits trying to get my M77 Roberts to shoot acceptable groups for me. The 117 btsp and SST shot the best eventually. I couldn’t get the 100gr anything to work for unknown reasons. The 115 BT has had success with others in the Roberts. I ran H414 in mine but it was not an ideal powder.

If I were you I’d give h4350 and h4831 both a shot. The h4831 has been pretty good in a 243 project I’m working on but I think it would be better suited to a Roberts.

Yeah I’m a big fan of the Roberts. Mine is now an AI version and twisted for the heavies.

 

[ChrisA]

Might want to confirm that your barrel twist can stabilize the Berger 117 gr bullet.

 

[Fartrell Cluggins]

H4350 is THE powder for the 257 Roberts. Load data is all over the place, but H4350 and the 115 NBT and NPT play very well together, from pedestrian 40.5 grain loads all the way up to 44+ grains. Start where you feel safe, but if someone handed me a modern 257 Roberts and asked me to develop a load, I'd start at 42.5. Somewhere between there and max I suspect you'll be happy.

 

[Weldor]

Might want to confirm that your barrel twist can stabilize the Berger 117 gr bullet.

Yeap.