Browning X Bolt Max long range vs Weatherby MK V Bartlein bbl 257 BEE

[Ironworker]

Now I’m worried . Perhaps it’s too much neck tension . Shot my Browning XBolt max long range today . Received ADG brass. But because I don’t have the neck size bushing yet for my fl bushing sizing die.i decided to load up the brass just the way they came. So burning Re#26 Sierra manual load recommendations. 150 gr Sierra MK bullet barrel has a 7” twist. At 100 yards my groups averaged 5” 5 shot groups ! Have I bought a “ Pig in the poke “ ? Along side on same bench set up I was getting typical accuracy out of my WBY MK V 257 Bee 3/4moa. Been shooting all my life ! What could be the problem ?

 

[Shinbone]

5" group? I'd check the scope and its mounts, first

 

[lancexxx]

Something more than a load

 

[Dusty Stevens]

What is a 257 bee?

 

[Ironworker]

What is a 257 bee?

257 Weatherby Magnum

 

[Rdlningcltchdmpr]

Now I’m worried . Perhaps it’s too much neck tension . Shot my Browning XBolt max long range today . Received ADG brass. But because I don’t have the neck size bushing yet for my fl bushing sizing die.i decided to load up the brass just the way they came. So burning Re#26 Sierra manual load recommendations. 150 gr Sierra MK bullet barrel has a 7” twist. At 100 yards my groups averaged 5” 5 shot groups ! Have I bought a “ Pig in the poke “ ? Along side on same bench set up I was getting typical accuracy out of my WBY MK V 257 Bee 3/4moa. Been shooting all my life ! What could be the problem ?

What caliber ?

 

[Ironworker]

What caliber ?

6.5 PRC. 150gr sierra I've since learned needs to be just .010-.020 off lands . I was seating at magazine length ,which was to far off the lands.