#### rufous

##### Well-Known Member

For example, starting the 160 at 3400 and with a zero of 275 yards:

At 700 yds velocity = 2180 fps; energy=1690; drop=65” and drift=27”

The 173 at a muzzle velocity of 3270 would have the following figures at 700:

Velocity=2300; energy=2040; drop=65”; and drift=22”

So clearly the 173 outperforms the 160. Now for the big question- does one really need a 1:9 twist for the 173 HV, especially in light of the fact that the 220 Sierra Matchking (one guy I have talked to is shooting the 240 Sierra Matchking from a 1:10 twist 300 Win Mag without any instability), the 200 Barnes X and the 180 J36 will all stabilize just fine from a 1:10 twist?

Any thoughts? Thanks, Rufous.