Gents.
I have a new old rifle that i have loaded with. A Win, 70 feather. in 257 R. I have a variety of Nosler, Horn, Sierra, and Barnes bullets as well as many powders to choose from, except Vhit. powders.
You fellas have a favorite bullet weight and powder for 257 Roberts. I'd like to find a load with Win 760 powder as I have a lot of this. thanks. FS

I have a 70 featherweight in 257 also.
it has done quite well with the hornady 120hp, and with speer 100gr boat tail controlled expansion bullets.
I'm no help with the win 680 but it's burn rate is pretty close to the RL-19 I do use.
I just took a couple of stabs at loads showing around 2800 fps in the books and found an accurate one for each bullet pretty easily.

I used to use 48 grs of H 414 with a 117 Sierra btsp. This was old military surplus powder so I'd start below that load. W760 is about the exact same powder as H414 in burn rate. Some jugs of that old H414 were actually W760.

My Roberts prefers Sierra 100gr SBT GameKing
and Varget. I suggest that you start at 36gr
and work up in .5gr increments.

I have 3 of them; first thing to do is see how long your throat is and how long you can seat bullets. One of my Rugers has such a long throat that I seat bullets way out and use 25-06 load data for MUCH higher velocities than originals. Your mag will allow long seating.

Varget , you say, I have some of that I can use, thanks for your suggestion.
Check that throat, I'll be sure and do this, need to find me some steel wool for the montdoug method of meausring to the lands.
thanks fellas... FS

Steel wool? Never heard of that method; just lightly size a case and stick a bullet in it and chamber it; carefully remove it and that is your max OAL to the lands. Let the throat seat the bullet into the case.

My 257 Bob AI loves H414 so I just follow the reloading manuals and use H414 if W760 is listed. Shoot mostly 110 AB.

100 accu I have 50 of those and I have some of the 110 inter to try as well. thankyou... FS.

117 or 120 gr bullet and a case full of H4831.

110 Accubonds and 36 grns of Norma 203B. Accurate and deadly!

A load for what??? I like nearly any plain vanilla cup and core 100 grains or better for deer. I think with 1/4 bores and thin skinned critters the whole premium/penetration thing is overrated. BT's and SST's are at the other end of the extreme. A nice controlled expansion git's er done every time. But what I would not do is try anything less than 100 gns, 117-120 is even better.

I usually run 4350 in my Bob AI but 760 should do a bang up job. Partitions, Hornadys or Sierras are all great, use which ever one shoots the best in your rig, put it in the boiler room and enjoy the steaks...

Oh, which Sierras do you have? Their 120 gn HP is a nice bullet but it was designed for 25-06 or better velocities and my not expand at lesser velocities. I wouldnt use that one in a Roberts. My personal preference is 120 gn speer or 117 gn Hornadys.

40 gr of IMR 4350 behind a 120 NP!!! Super accurate in my 1 Bob. Deadly on all up to elk.