257 magnum help

[Dmbjr]

Can anyone guide me to a good hand load with 115NBT’s I have a few hundred of them. The issue is the gun is brand new the heads are given to me.

The powders that are best are out of stock so could anyone suggest a load from Ramshot Magnum or MAGPRO? I wish I could get the other powders but tough to come by at moment.
Thanks Dennis.

 

[slatebuilder]

I have had really good luck with IMR 4350 in a 257. Roy’s used a lot of that powder in his favorite. Nosler book says 59 grains max. Old Lyman book says 64.

 

[Dmbjr]

Do you recall velocity on the 115NBT from Lyman book?

 

[slatebuilder]

I just looked, it’s 3322, HOWEVER, that data is for 117 bullet not 115, so proceed carefully.