longrangebob
Well-Known Member
Think about 215M and Norma MRP ...
LRM primers ok to use on 257 WTHBY
- Thread starter rcs33
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Im excited about it. My oldest boy won it in our hunting club's kid's shooting contest. We took it out last week for the first time and 2 of the loads that came with the gun were squibs—1 primer failed to detonate, but the second made it halfway down the barrel— had to drive it out with a stick of 1/4" allthread), so we called it quits for the day— never, ever trust loads from a third party— funny, i thought i already knew that.
Die set arrived yesterday and we'll get after it tonight. I pulled all the bullets from the shells we hadnt fired and although there werent any totally empty cases, about half of them had spherical powder (maybe H 450?) and the others all had cylindrical (who knows?), i didnt weigh the charges that came out, but whoever loaded them definitely didnt weigh every charge. Anyway— thanks for everyone's responses— very helpful.
Die set arrived yesterday and we'll get after it tonight. I pulled all the bullets from the shells we hadnt fired and although there werent any totally empty cases, about half of them had spherical powder (maybe H 450?) and the others all had cylindrical (who knows?), i didnt weigh the charges that came out, but whoever loaded them definitely didnt weigh every charge. Anyway— thanks for everyone's responses— very helpful.
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.
My nosler books are what said fed 210
misterc01
Well-Known Member
Interesting - I contacted Federal about using Manum primers in plave of standard primers, and they did nto recommend it. I have also read that some reduce thier powedr by 5-10 garins when they do. I just stick with match primers go with that.
X-2
You're safe with either. I only use the 215's
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Use those 215's. With friends and my son including myself, we all load the 215M primer and H1000. All but one are shooting the 115 Berger VLDH. Tried CCI primers and other powders, but couldn't beat this load. A couple of MK-Vs and Vanguards.
Lenny Foffa
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Always and Only used Federal 215 M GM primers in both my 270 Weatherby Mag and 300 Weatherby Mag. Now with the shortage, I have been using Federal 215 M Primers in my 270 Weatherby Mag. Shooting 150 Grn Nosler ABLR at 2850 fps I have not seen a difference at the 100 yard range yet. I will be increasing the charge from 66.0grns to 66.5 or 66.7 grains to get 2900 fps. I don't expect to see much difference at 100 yards. The 300 yard targets may tell a different story.
Yup—thats exactly what i found. I think my Swift book says 210 also.
I have had 257 Weatherby's for many years and have always used Magnum primers.
thwatson2
Well-Known Member
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.
