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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth for a newbie
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<blockquote data-quote="DUSTY NOGGIN" data-source="post: 1406976" data-attributes="member: 89550"><p>.025 magazine well ,would be just right , gives a little clearance </p><p></p><p>so the closest you get to your lands is .040 , no problem </p><p></p><p>i personally work on powder </p><p>first do optimal charge weight need to find the plateau plateaus of the one shot ladder and making sure you find pressure limits during this test , by loading to maximum or better </p><p></p><p>!!! knowing you will be pulling disassembling everything charged higher than your pressure signs as soon as you get back to the press !!!</p><p></p><p> then would suggest a full array of powder from minimum to maximum shooting at each set at its own target at 200 yard with that 7 ( or 100 yard), then once you find the hourglass effect and can see the obvious trend keep notes , then you will have a visual measurement of your nodes ,so to say </p><p></p><p>this is just me and my chaotic mind thinking : </p><p>seating does 2 things and changes pressure going both directions -- the farther away from the middle ground that faster those changes happen </p><p></p><p>*seating deeper into the case , reduces pressure by giving bullets more momentum as it swages itself into the rifling/lands </p><p>*seating deeper into the case , ALSO increases pressure by creating less volume in the case capacity ( but changes pressure faster )</p><p>* seating longer ( assuming you do not touch lands ) increases pressure ( more so with all copper bullets ) - has to start swaging as soon as it starts moving </p><p>* seating longer ALSO reduces pressure by increasing case capacity ( skewing the graph of pressure - so changes happen faster over same amount of time ) </p><p></p><p>pictures this , a skateboard with a small pebble right in front of the front wheel - if you get a running start and try to land on that skateboard and roll over it you may end up landing on your face , but if you give that skateboard a rolling start of 6" or so inches and do same thing you will roll right over that pebble ... you will most gun manufactures make the magazine shorter than you could ever touch the riflings , </p><p></p><p>almost like getting free throat erosion with every purchase !!! </p><p></p><p>so i think in your situation with what you have described above you will get the best of both worlds by seating as long as your magazine well will allow ( decreasing the pressure per given area of case capacity ) and adjusting your overall pressure by charge weight </p><p></p><p>IMO staying away from both factors will lessen pressure changes and the closer you get to either factor increases the variation of those changes </p><p></p><p>i believe the seating depth test is really just seeing how far away you are moving the skateboard away from the pebble , knowing it will roll over it reliably </p><p></p><p>knowing that your ballistic tip bullet is a very soft bullet compared to others , it will swage a lot easier than other bullets </p><p></p><p>... i think that the .040 jump you are at is very good and all other pressure adjustments can be made with careful precise power charges ( to the 10th of a grain )</p></blockquote><p></p>
[QUOTE="DUSTY NOGGIN, post: 1406976, member: 89550"] .025 magazine well ,would be just right , gives a little clearance so the closest you get to your lands is .040 , no problem i personally work on powder first do optimal charge weight need to find the plateau plateaus of the one shot ladder and making sure you find pressure limits during this test , by loading to maximum or better !!! knowing you will be pulling disassembling everything charged higher than your pressure signs as soon as you get back to the press !!! then would suggest a full array of powder from minimum to maximum shooting at each set at its own target at 200 yard with that 7 ( or 100 yard), then once you find the hourglass effect and can see the obvious trend keep notes , then you will have a visual measurement of your nodes ,so to say this is just me and my chaotic mind thinking : seating does 2 things and changes pressure going both directions -- the farther away from the middle ground that faster those changes happen *seating deeper into the case , reduces pressure by giving bullets more momentum as it swages itself into the rifling/lands *seating deeper into the case , ALSO increases pressure by creating less volume in the case capacity ( but changes pressure faster ) * seating longer ( assuming you do not touch lands ) increases pressure ( more so with all copper bullets ) - has to start swaging as soon as it starts moving * seating longer ALSO reduces pressure by increasing case capacity ( skewing the graph of pressure - so changes happen faster over same amount of time ) pictures this , a skateboard with a small pebble right in front of the front wheel - if you get a running start and try to land on that skateboard and roll over it you may end up landing on your face , but if you give that skateboard a rolling start of 6" or so inches and do same thing you will roll right over that pebble ... you will most gun manufactures make the magazine shorter than you could ever touch the riflings , almost like getting free throat erosion with every purchase !!! so i think in your situation with what you have described above you will get the best of both worlds by seating as long as your magazine well will allow ( decreasing the pressure per given area of case capacity ) and adjusting your overall pressure by charge weight IMO staying away from both factors will lessen pressure changes and the closer you get to either factor increases the variation of those changes i believe the seating depth test is really just seeing how far away you are moving the skateboard away from the pebble , knowing it will roll over it reliably knowing that your ballistic tip bullet is a very soft bullet compared to others , it will swage a lot easier than other bullets ... i think that the .040 jump you are at is very good and all other pressure adjustments can be made with careful precise power charges ( to the 10th of a grain ) [/QUOTE]
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