Hi all,
new here... I have a .243 win. Savage 11 with a McGowen 1:12 26" varmint Stainless barrel. So far I achieved 1/4 inch or better at 100 yards. At 300 not so good... 3 inches. I found JBM Ballistic Calculator and a Twist Calculator on line. I was told the JBM is better. Which would be the way to go... bullet weight or length?