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Rifles, Reloading, Optics, Equipment
Reloading
"Rebounding" NATO 7.62 brass???
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<blockquote data-quote="308plinkerVT" data-source="post: 2729057" data-attributes="member: 117224"><p>Having just wrung this out with a fellow shooter as well: Mil spec chambers are oft more generous to start with. Some of those implements may have to function after crunching on stuff, not just moving at high rates of speed. Chambers can be very generous in all directions but I can specifically speak about length from personal experience. We had one that you could put two pads of scotch tape on a 308 NO GO base and we saw over 80% closure (ballpark) of the final bolt travel on a m14 type rifle, this was compared with measurements from a gage supplier and found technically in spec. The cases did fit the Wilson but would need just a little nudge to fully bottom - I've also seen 300wsm ones that wouldn't drop past 1/2.</p><p>Other tidbits I've picked up picked up over time: Mil brass can harder, not always thicker, in its manufacturers design ideals for what pressure it's being designed to reach, ONCE. Keep that in mind. I haven't yet run across that posted anywhere but in my mind it makes sense with all the variables we normally think of plus whatever metallurgy aspects they don't tell us about. Some of the service rifles make them more like a banana too. Annealling and small base steps would be my way of treating them as you pull them "fresh" from your supply. Add a mandrel and the 3-10 count pause during case work steps depending how they feel when they go in the sizer will help with the springback. (I used to make 1000 300W each weekend from mixed milspec brass (mostly LC then) before the 300aac hit the market if that helps you understand my "feel" on press operations. Having spent some time with various new/used 7.62 cases too - all have different "going in the sizing die" feels that can help you determine the pause needed. Be diligent with your measurements and trimmings. A VLD chamfer will make transition over harder edges easier and less jacket damaging depending how ticky your being. The Sinclair tool that goes along with the Wilson gage you mentioned is good too, even if potentially causing more questions.</p><p>Considering what time you will spend on any non Lapua brass checking if it was "made on a Monday or Friday" it's good to have these tidbits known and notes taken to help determine how you will spend your time vs your saved pennies down the road.</p></blockquote><p></p>
[QUOTE="308plinkerVT, post: 2729057, member: 117224"] Having just wrung this out with a fellow shooter as well: Mil spec chambers are oft more generous to start with. Some of those implements may have to function after crunching on stuff, not just moving at high rates of speed. Chambers can be very generous in all directions but I can specifically speak about length from personal experience. We had one that you could put two pads of scotch tape on a 308 NO GO base and we saw over 80% closure (ballpark) of the final bolt travel on a m14 type rifle, this was compared with measurements from a gage supplier and found technically in spec. The cases did fit the Wilson but would need just a little nudge to fully bottom - I've also seen 300wsm ones that wouldn't drop past 1/2. Other tidbits I've picked up picked up over time: Mil brass can harder, not always thicker, in its manufacturers design ideals for what pressure it's being designed to reach, ONCE. Keep that in mind. I haven't yet run across that posted anywhere but in my mind it makes sense with all the variables we normally think of plus whatever metallurgy aspects they don't tell us about. Some of the service rifles make them more like a banana too. Annealling and small base steps would be my way of treating them as you pull them "fresh" from your supply. Add a mandrel and the 3-10 count pause during case work steps depending how they feel when they go in the sizer will help with the springback. (I used to make 1000 300W each weekend from mixed milspec brass (mostly LC then) before the 300aac hit the market if that helps you understand my "feel" on press operations. Having spent some time with various new/used 7.62 cases too - all have different "going in the sizing die" feels that can help you determine the pause needed. Be diligent with your measurements and trimmings. A VLD chamfer will make transition over harder edges easier and less jacket damaging depending how ticky your being. The Sinclair tool that goes along with the Wilson gage you mentioned is good too, even if potentially causing more questions. Considering what time you will spend on any non Lapua brass checking if it was "made on a Monday or Friday" it's good to have these tidbits known and notes taken to help determine how you will spend your time vs your saved pennies down the road. [/QUOTE]
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"Rebounding" NATO 7.62 brass???
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