Quick Answer
A 6mm Creedmoor rifle failing to group well can be caused by a variety of factors, including improper bullet seating, inconsistent chamber pressures, and inadequate rifle bedding. To troubleshoot, inspect the chamber and throat for signs of wear or excessive pressure. Consider checking the rifle's action and stock for any signs of misalignment.
Checking Bullet Seating
Proper bullet seating is crucial for optimal performance. A good starting point is to seat the bullet to the recommended depth, which for a 6mm Creedmoor is typically between 0.010 and 0.020 inches from the lands. Exceeding this depth can lead to excessive pressure and poor accuracy. Use a good quality case gauge to ensure accurate measurement. For example, if using a 105-grain bullet, seat it to 2.800 inches, which is 0.010 inches from the lands.
Chamber and Throat Inspection
Inspect the chamber and throat for signs of excessive wear or carbon buildup. A worn chamber can lead to inconsistent chamber pressures, while a dirty throat can cause bullet instability. Use a chamber brush and solvent to clean the chamber, and inspect the throat with a bore light. If excessive wear is present, consider having the rifle rechambered or replacing the barrel.
Action and Stock Alignment
Verify that the rifle’s action and stock are properly aligned. Misaligned components can cause the barrel to vibrate, leading to poor accuracy. Use a set of action screws and a stock alignment tool to ensure proper alignment. For a 6mm Creedmoor, the action should be aligned to within 0.001 inches of the stock’s bedded area.
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