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<blockquote data-quote="RegionRat" data-source="post: 2621882" data-attributes="member: 57231">1) This is one of those &quot;it depends&quot; answers. Many accomplished BR shooters and Highpower shooters will debate the topic at length, with some saying it has proven critical and others claiming it makes little difference.Jack Neary mentioned a story how important is has proven to him in those video taped lectures he gave. I don&#039;t shoot BR, but I will say that it is just as easy to keep this topic under control as compared to the work it would take to investigate.At least two completely different systems exist, ones that index the cut from the base, and ones that index the cut from the shoulder. Both work well for me and I can keep case batch length variation to less than 0.003&quot; with very little effort.ETA: I forgot the kind that index off a rod that runs on the bottom of the case web, which I would never use.2) If the cut is from the base it usually comes out less than 0.0015&quot;, and from the shoulder it comes out less than 0.003&quot;, that is after chamfer and tumble.3) You can pick your system. You either measure your actual chamber, or go from specifications. I keep all of them to within 0.010&quot; of the recommended max, but a batch will be within less than 0.003&quot;. That happens because I set up the trimmer and run them all over the trimmer every cycle, and also chamfer after every cycle. On a rare occasion I may get away without trim, but I still chamfer ID and tumble to remove lube.&nbsp; YMMV.I will add that some specifications allow more than 0.010&quot; for case length. I will pose a question for thought. What do you suppose happens if a carbon ring builds up near the end of the case mouth in the chamber, and then a longer than usual case is used? Not all hunting chambers have the same neck clearance designs, but I think along with trimming, it is best to clean your chamber area well enough to prevent carbon or hard residue from building up in the neck area. YMMV.</blockquote>

[QUOTE="RegionRat, post: 2621882, member: 57231"] 1) This is one of those "it depends" answers. Many accomplished BR shooters and Highpower shooters will debate the topic at length, with some saying it has proven critical and others claiming it makes little difference. Jack Neary mentioned a story how important is has proven to him in those video taped lectures he gave. I don't shoot BR, but I will say that it is just as easy to keep this topic under control as compared to the work it would take to investigate. At least two completely different systems exist, ones that index the cut from the base, and ones that index the cut from the shoulder. Both work well for me and I can keep case batch length variation to less than 0.003" with very little effort. ETA: I forgot the kind that index off a rod that runs on the bottom of the case web, which I would never use. 2) If the cut is from the base it usually comes out less than 0.0015", and from the shoulder it comes out less than 0.003", that is after chamfer and tumble. 3) You can pick your system. You either measure your actual chamber, or go from specifications. I keep all of them to within 0.010" of the recommended max, but a batch will be within less than 0.003". That happens because I set up the trimmer and run them all over the trimmer every cycle, and also chamfer after every cycle. On a rare occasion I may get away without trim, but I still chamfer ID and tumble to remove lube. YMMV. I will add that some specifications allow more than 0.010" for case length. I will pose a question for thought. What do you suppose happens if a carbon ring builds up near the end of the case mouth in the chamber, and then a longer than usual case is used? Not all hunting chambers have the same neck clearance designs, but I think along with trimming, it is best to clean your chamber area well enough to prevent carbon or hard residue from building up in the neck area. YMMV. [/QUOTE]

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