Disaster with Barnes TSX in 257 Weatherby

My best guess is with that huge freebore and minimum load, you are getting extremely low pressure and velocity, thus the keyholing and poor accuracy.
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Huge? Does anyone measure? I am the fan of the running start, I want my bullets to have that 'jump'.

I have measured free bore, I have found chambers that allowed the bullet to leave the case and travel .300" before hitting the lands; now that is huge. At the same time I found 300 Win Mag shooters that wanted to jack up the 300 WM.

F. Guffey
 
Barnes

As others have said this might be a free bore issue in conjunction with an elongated bullet.

Have you tried to slightly seat your bullet in a case and chamber it to see where it encounters the lands/grooves?

Try this and adjust your seating die to approximately 1/10th inch before bullet contact and see what happens.

My experience with Barnes TTSX in 7mm out of a 7x30 Waters have been -1/2-inch MOA at 100yds.

Good luck and let us know what happens.
 
It's a Weatherby, right? Good luck seating it out to touch the lands. With the high intensity Weatherby rounds, the freebore is there for a reason. It's the running start of which Mr Guffey speaketh.
 
The shorter flat base Sierra bullet would/should give considerable better accuracy than an all copper longer length TSX bullet, I wouldn't be surprise the TSX bullet would be .050" or longer than a lead core hunting bullet!! William
 
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