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Posted: 11/2/2010 12:10:06 PM EDT
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Can someone give me the rundown on what this little device does? I am starting to reload .308 for a new boltgun
I aquired, and am looking at all the different gadgets for relaoding precision ammo. Any help would be appreciated. Thanks! |
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It makes the case necks a uniform thickness of even bullet tension and concentric bullet release when fired, you'll also need a neck thickness gauge(or at least a ball mic) to check neck thickness before and after turning. Brass that has more than .0005" to .001" in thickness variation should be left for plinking ammo since the thin spot runs the full length of the case and not just in the neck, that thin side will still expand faster since that's the weak side of the rest of the case when fired and defeat the purpose of turning necks, so save your best brass for neck turning.
I use the K&M setup for .223 & 6.8SPC and it works great. 
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EWP makes a good point, neck turning bad brass is like putting lipstick on a pig. Neck turning, when done very lightly, will make your best brass better.
This endeaver is best left to benchrest tournaments or 600 yards and longer competitions. It's time consuming, expensive and has very little effect with commercially manufactured chambers. Benchrest shooters have their chambers cut with the expectation that the neck will be (must be!) turned. Regular brass will not fit and will create a dangerous over pressure experience. Many long range shooters may have tighter than normal chambers, but do not "require" that the brass necks be turned. I have opted for what's known as no turn necks on my newest long range rifles. They have .004" neck clearance on Lapua brass. That's only .002" per side. I don't turn for them at all. Instead I select the best brass and shoot it as it comes from the Lapua factory. When I turn necks for bolt action rifles I simply skim the high side off the brass. As EWP stated, most brass will be thin on one side, I'm getting the fat side a little closer to that measurement. Most of my turned necks will only have cuts on half the circumference +/-. |
| I've tried plain and turned cases in my custom .308 M700 and there is no differance in accuracy. The only differance is the cases with turned necks don't seem to last as long before the necks split. Unless you have a rifle with a tight neck chamber I wouldn't waste my time turning necks. |
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I thought about this for a brief time and decided that using brass like Lapua for my Savage (all stock) was good enough, I also spoke with several BR shooter's and they advised that unless I was going to be shooting 500-1000yrds and using a custom setup the cost would outweigh the benefit kinda like trimming meplats
I do baby my match brass and did the primer pocket uniforming along with flash hole prep and only neck size and have decided that is good enough |
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