Great 300 wsm rounds for longer shooting, 2.5 inch pattern at 300 yards. very repeatable. - Barnes Vor-Tx .300 Winchester Short Magnum 150 grain TTSX Boat Tail Centerfire Rifle Ammunition

I used to shoot Winchester ballistic silvertips (very comparable specs on bullet and ballistics) but they are no longer available. I've shot two boxes of these at 300 yards and they are more accurate than my eyes are anymore. At my best round I put six in a row into a 2.5 inch pattern at 300 yards which for me is stupendous.

Note, I am using a custom 1:12 twist barrel which works perfect for these beasts. If you have a 1:10 or 1:8 twist rate, you may want to go to a heavier/slower slug. On my Tikka 1:10 barrel the similar Winchester BST's were spinning too fast at this velocity and you couldn't find them after 200 yards sometimes. 180's at 2900 fps were spot on, but I don't like to lob things.

From my spreadsheet on these bullets.

Caliber 0.308 Inches
Bullet Weight 150 Grains
Bullet Length 1.22 Inches
Barrel Twist 12 Inches/turn
muzzle velocity 3310 fps
Temperature 60 degrees Fahrenheit (59 is standard)
Pressure 29.92 inches of mercury (29.92 is standard)

Sg = 1.63 (1:10 gives you 2.34 on these)

Sg shouldn't be less than 1.4. If Sg is greater than about 2.0, you may
gain some accuracy by going to a slower twist barrel.