1:10 will easily stabilize the 140 gr .284 bullet. If you ever
plan on shooting 160-175 grs, you may wish to look at a 1:9 rate
of twist. Of couse, it does matter which bullets you shoot.
For instance, a Barnes TSX 150-gr bullet is as long as a Hdy
175-gr bullet. Obviously, 160 & 175-gr Barnes TSX bullets are
longer yet. The additional length, depending on velocity, may
or may not stabilize w/1:10 rate of twist. Frankly, I've not
experienced any problems with the 160-gr TSX or the 168 VLD
bullets in my 7x57 that has a 1:10 twist. OTOH, my 280 Rem has
a 1:9 twist. Both rifles are tack drivers and produce sub-MOA.
If you're shooting Berger 180-gr VLD bullets, you might want to
consider a 1:9 twist.
As a side note, both my 7mm barrels (7mmTCU & 7-30) for my T/C contender have a 1:9 rate of twist probably due to the lower velocity.
