Starline .308 Case Neck Uniformity

• 48 pieces of brass from my 178-179gr case weight bin were measured for case neck uniformity using a home brew neck gauge with a .0005” dial indicator
• My neck gauge is based on Chris Long’s design further described here:

  Tools for Measuring Case Necks within AccurateShooter.com

• The 178-179gr weight bin was selected as it contained the average case weight from my earlier case weight study.

Results:

• Average neck thickness is .0146”.
• Average neck thickness variation (max - min) = .001”
• Standard deviation of neck thickness variation = .000 6”

Conclusion:

• I might continue to measure neck thickness and discard any pieces greater than .002”, which would have been just one piece in this 48 piece group. I will not pursue neck turning as my rifle’s chamber doesn’t require it.

Attached Images

	case_gauge.jpg (63.1 KB, 27 views)
	30cal_pilot.jpg (32.3 KB, 21 views)
	hist_neck_variation.jpg (4.9 KB, 23 views)