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Trim Length for 6.5mm BRM and Other BrassThere are two reasons to trim your brass: First is just to make sure it's not too long for your chamber. But second, is to even them all up to the same length for accuracy considerations. 1. A Chamber Diagram (left) will tell you the maximum length. If everything measures shorter than that, you shouldn't have to trim unless you want to even them all up. Chamber diagrams for most cartridges are listed at the ammoguide.com website. 2. How to …

A Sweet Spot for Accuracy Exists Somewhere Between a Jam Fit and .150" Off the Lands... Introduction by Eben Brown - The popular thinking is to seat bullets as close to the rifling as possible if you want to get accuracy. But that isn't always the best approach. This article on Long Jump bullet seating was brought to my attention by Nick Wynne (aka UncleNick) on Shooter's Forum. It explains a lot of things... For example: Roger Brown's .127" Group with a bullet seating depth of .14 …