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Rifles, Reloading, Optics, Equipment
Reloading
Need guidance...case neck thickness
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<blockquote data-quote="dok7mm" data-source="post: 1594968" data-attributes="member: 90080"><p>This thread has been well covered, with a lot of good info and little bits not so good, so I'll chime in.</p><p> First of all, BR shooters are not the only ones, who can benefit from neck turning ( trimming is an OAL thing). With so many reloaders going to bushing dies, we find that consistent neck thickness = consistent tension, when using type S dies. More and more LRH are learning to pick their brass first, measure the turn that brass needs for 100% cleanup, then fit it to their reamer neck dimensions. They then order FL dies that do not oversize their brass. Neck clearance can be .002 - .004, or more, as they wish or whichever their rifle shoots the best. I like to start at 3 thou, then try .004.</p><p> It's advantageous to monitor neck thickness as they get fired, because if you have dies and a chamber that don't match up, you may find that shoulder creeping into the neck. Many, new to turning, are afraid to turn into the shoulder enough to prevent, or delay, donuts. Not a problem, unless you're putting bearing surface past neck/shoulder junction. "Knock on wood", I've turned 4,000 + cases, cut well into shoulder, and never left a neck in the chamber. I can't tell anyone how much to cut into shoulder,as there is no good way to measure it.</p><p> I do not chamfer or debur prior to turning, unless it's done at the factory.</p><p>I feel a chamfer thins the neck slightly, causing a slight bell, on case mouth edge, and catches on leading front of cutter, causing a jerky action that can deform the neck edge. As for debur of factory trim, the cutter takes it off. I just expand, lube and turn, then chamfer and debur.</p><p> As for turning brass for factory rifles, that already have 6-8 thousands of clearance, DON'T. It's far better to size neck down and then expand with a mandrel die to 2-4 thou under bullet diameter, for your desired tension. And, remember tension is more about how much of the neck is sized, than what size bushing or mandrel is used.</p><p> Last thought......wide cutters do not make for a smoother cut, proper feed rate makes a smooth cut. Wider cutters actually increase friction somewhat and therefore, the temperature of the case neck and pilot. Also, rig up a spacer for your ball micrometer, so that you are always measuring at same point, from case to case.</p></blockquote><p></p>
[QUOTE="dok7mm, post: 1594968, member: 90080"] This thread has been well covered, with a lot of good info and little bits not so good, so I'll chime in. First of all, BR shooters are not the only ones, who can benefit from neck turning ( trimming is an OAL thing). With so many reloaders going to bushing dies, we find that consistent neck thickness = consistent tension, when using type S dies. More and more LRH are learning to pick their brass first, measure the turn that brass needs for 100% cleanup, then fit it to their reamer neck dimensions. They then order FL dies that do not oversize their brass. Neck clearance can be .002 - .004, or more, as they wish or whichever their rifle shoots the best. I like to start at 3 thou, then try .004. It's advantageous to monitor neck thickness as they get fired, because if you have dies and a chamber that don't match up, you may find that shoulder creeping into the neck. Many, new to turning, are afraid to turn into the shoulder enough to prevent, or delay, donuts. Not a problem, unless you're putting bearing surface past neck/shoulder junction. "Knock on wood", I've turned 4,000 + cases, cut well into shoulder, and never left a neck in the chamber. I can't tell anyone how much to cut into shoulder,as there is no good way to measure it. I do not chamfer or debur prior to turning, unless it's done at the factory. I feel a chamfer thins the neck slightly, causing a slight bell, on case mouth edge, and catches on leading front of cutter, causing a jerky action that can deform the neck edge. As for debur of factory trim, the cutter takes it off. I just expand, lube and turn, then chamfer and debur. As for turning brass for factory rifles, that already have 6-8 thousands of clearance, DON'T. It's far better to size neck down and then expand with a mandrel die to 2-4 thou under bullet diameter, for your desired tension. And, remember tension is more about how much of the neck is sized, than what size bushing or mandrel is used. Last thought......wide cutters do not make for a smoother cut, proper feed rate makes a smooth cut. Wider cutters actually increase friction somewhat and therefore, the temperature of the case neck and pilot. Also, rig up a spacer for your ball micrometer, so that you are always measuring at same point, from case to case. [/QUOTE]
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Need guidance...case neck thickness
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