longrangebob
Well-Known Member
Think about 215M and Norma MRP ...
Now that ive started looking into it further, that doesnt surprise me.That actually surprises me, that the load data is with standard primers.
Not that there's anything wrong with using standard primers, you won't have trouble using standard or magnum primers. Magnum primers give a little extra ignition insurance, especially in cold weather with compressed loads of slow burning powder. But in nearly all cases they're not needed but neither does it hurt anything to use them, and in the current supply climate just use what you have/can find and think about it no further!
Some think the magnum primers are REQUIRED…fun fact, federal developed the 215 primer in conjunction with weatherby's development of the mighty .378 wby in the 50s. Before this there was no such thing as magnum or standard primers, just primers. That means the .300 hh, 375 hh, the original weatherby cartridges, the 404 Jeffery (RUM parent case), the 416 rigby (338 lapua parent case) and even the colossal .505 Gibbs (cheytac parent case) were all somehow functioning flawless with ordinary primers!!!!!
Have always used Fed 215.Any thoughts are welcome, but I've largely answered my own question-- I looked through some of my ancient manuals (pre-1985) from hornady, Sierra and hodgdon and discovered they used cci 250s and fed 215s on their test loads.
Now that ive started looking into it further, that doesnt surprise me.
My nosler books are what said fed 210Now that ive started looking into it further, that doesnt surprise me.
X-2Yes, use the same primers as your 300 and 340 WBTY. H4831/SC burn rate is probably a good starting point.
You're safe with either. I only use the 215'sI recently got a second-hand 257 WTHBY and noticed that all of the reloading books I have spec fed. 210 or "regular" rifle primers. I have several thousand magnum rifle primers for our 300 and 340 WTHBY mags, but no std primers. I would expect to have to tone my loads down a little with the LRM primers but does anyone know how much? I have H4831 and IMR 4350 and 4831 and was wanting to run 120g noslers at around 3100fps. I know how I should do this--but i was hoping someone might have prior experience with this issue so I'm not starting totally blind with limited powder to burn on dead ends.
Yup—thats exactly what i found. I think my Swift book says 210 also.You're safe with either. I only use the 215's
I load the 257 wthby with mag primers with exact powder charges listed. Just look for signs of pressure and use those mag primers. I use federal 215 mag primers for everything, from 220 swift to 30-06 to 375 h&h. I don't use regular rifle primers. They never fail and I have never had issues.I recently got a second-hand 257 WTHBY and noticed that all of the reloading books I have spec fed. 210 or "regular" rifle primers. I have several thousand magnum rifle primers for our 300 and 340 WTHBY mags, but no std primers. I would expect to have to tone my loads down a little with the LRM primers but does anyone know how much? I have H4831 and IMR 4350 and 4831 and was wanting to run 120g noslers at around 3100fps. I know how I should do this--but i was hoping someone might have prior experience with this issue so I'm not starting totally blind with limited powder to burn on dead ends.