BadMatrix
Bearcat
Neck bushing, you mean a case gauge? What a headache. SAAMI headspace is 1.8006-1.8016". I have a target value of 1.8011" but it seems difficult to get there. I am using a Hornandy comparator for the measurements.Sizing the brass has reduced the neck OD. Measure the neck OD on the un-sized brass. If it is larger than .260 that is the problem caused by the brass manufacturer. If it is less than .260 you probably have a severe carbon ring.
Case headspace is a major issue with the Swift. Due to the angle of the shoulder it moves forward with every firing. This is exactly why I told you that you have to resize and push back the shoulder .002 to .003 after every firing. Again, you need to buy a .264 neck bushing and establish datum line on the shoulder and check every piece of brass after firing.
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