Quick Answer
Zero your .243 at 100 yards using a bullet that provides a 1-2 MOA spread, such as the Speer 95-grain Varmint or the Hornady 75-grain V-Max. Shoot a group and adjust your scope until the center of the group is on target. Use a chronograph to verify your bullet's velocity.
Choosing the Right Bullet
When choosing a bullet for varmint hunting, consider the weight and expansion characteristics. A lighter bullet like the 60-grain Nosler Varmageddon can deliver high velocity and deep penetration, but may not expand as much as heavier bullets. Heavier bullets like the 95-grain Speer Varmint can provide more expansion and a wider wound channel. The ideal weight will depend on the target animal and the desired level of expansion.
Zeroing Techniques
To zero your .243, shoot a group at 100 yards and adjust your scope until the center of the group is on target. Use a Mil-Dot reticle or a scope with a built-in adjustment system for ease of use. If you’re using a first focal plane scope, you can zero at 100 yards and the subtensions will remain accurate out to longer ranges. If you’re using a second focal plane scope, you may need to adjust your scope for each range.
Considerations for Flat-Shooting
The .243 is a flat-shooting cartridge that is well-suited for varmint hunting at longer ranges. However, it can be affected by wind deflection and bullet drop. To mitigate these effects, use a scope with a generous ocular field of view and a Mil-Dot reticle. Additionally, use a chronograph to verify your bullet’s velocity and make adjustments accordingly.
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