240 weatherby twist rate

[moosie]

I am building a custom 240 weatherby mag and want to shoot 85 gr ttsx, 87 gr berger and have the option to shoot 105 gr bergers for big northern whitetails. What twist rate should I go with? my smith suggested 1:9. Is anyone out there shooting this combination of bullets out of a 6mm with success (in terms of accuracy) and with what twist?

[Joel Russo]

I have a custom .240 Wby with a 28",9 twist barrel, and I shoot a 105gr bullet at 3380 fps. The load is 52 gr of RL22, which is a max load for this combination. Accuracy is astounding as it has shot numerous .0" groups at 100 yds. The rifle has never had anything but the 105-107 grain bullets through it as it was built as a long range varmint and deer rifle. If you are building your rifle for long range application, then I suggest you use the 9 twist barrel as you will be able to shoot the 87-107 grain bullets. Not sure I would use the Berger on big northern whitetails, but that's your call...

[moosie]

Ok. 1:9 it is. Thanks Joel.

[Edd]

Berger recommends an 8 inch twist for their 105 gr bullets.

[moosie]

Well I've done a lot of reading through various manuals and I would like to hear from shooters with real life experience. There's no substitute for real life experience regardless of what the books say!

[Edd]

Originally Posted by moosie

Well I've done a lot of reading through various manuals and I would like to hear from shooters with real life experience. There's no substitute for real life experience regardless of what the books say!

I reckon so.

After all, what could the people who make them and test them know about the best twist to stabilize them.

[Lefty7mmstw]

You don't need quite the twist with the 240 roy in a long barrel at 10% more velocity than the 243. Even in a 24" bbl. 243 win a 105 could barely hit 3 K fps and they will list twist for the slower rounds that can use the bullet. You can back off the twist 10% and still be at the same rpm.