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Rifles, Reloading, Optics, Equipment
Reloading
7mm RUM reloading difficulties
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<blockquote data-quote="Fiftydriver" data-source="post: 83232" data-attributes="member: 10"><p>HillCountry54,</p><p></p><p>Lets walk though this and figure out where the problem is occuring.</p><p></p><p>Step one, take a fired case and chamber it in your rifle. If you are running normal pressures the fired case should chamber even if it takes a bit of pressure on the bolt to lock her down. If the bolt will simply not close on a fired case you are WAY over pressure and need to back your loads off. If it chambers move to step two.</p><p></p><p>Step two, size the case in your usual manor, clean off any excess lube and again chamber in the rifle. IT should chamber at least as easily as the unsized fired case and usually even easier depending on the load level used.</p><p></p><p>If it will not chamber something is wrong with your sizing die which I doubt but it may be, just rule it out. If it does chamber then move onto step 3.</p><p></p><p>Step 3.</p><p></p><p>With no primer or powder in the case, seat a bullet to the same length just as you would with a finished loaded round. Chamber the round and see what happens.</p><p></p><p>If it does not chamber there are a couple things that can cause this.</p><p></p><p>A. The seating length for the bullet is to long and it is contacting the origins of the rifling and not allowing the round to fully chamber so the bolt can lock down.</p><p></p><p>B. The die is turned down to far in the press and its built in crimping shoulder in the die is trying to crimp the case mouth into the bullet. If there is no crimping groove this generally results in a slightly bulged shoulder which maked it nearly impossible to chamber in the rifle.</p><p></p><p>I would suspect this may be the problem. To check this, take a sized case that is know to chamber easily in the rifle, out it in the shellholder in your press, raise the ram to its highest point and then screw the seating die down until it just contact the case. Turn it back 1/16 of a rotation and seat the bullet to the proper OAL you want by adjusting the seating stem adjuster, not by turning the entire die down in the press.</p><p></p><p>Go through the steps one at a time and figure out at what point the case is being deformed out of spec. Then correct the problem.</p><p></p><p>Have a good evening,</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 83232, member: 10"] HillCountry54, Lets walk though this and figure out where the problem is occuring. Step one, take a fired case and chamber it in your rifle. If you are running normal pressures the fired case should chamber even if it takes a bit of pressure on the bolt to lock her down. If the bolt will simply not close on a fired case you are WAY over pressure and need to back your loads off. If it chambers move to step two. Step two, size the case in your usual manor, clean off any excess lube and again chamber in the rifle. IT should chamber at least as easily as the unsized fired case and usually even easier depending on the load level used. If it will not chamber something is wrong with your sizing die which I doubt but it may be, just rule it out. If it does chamber then move onto step 3. Step 3. With no primer or powder in the case, seat a bullet to the same length just as you would with a finished loaded round. Chamber the round and see what happens. If it does not chamber there are a couple things that can cause this. A. The seating length for the bullet is to long and it is contacting the origins of the rifling and not allowing the round to fully chamber so the bolt can lock down. B. The die is turned down to far in the press and its built in crimping shoulder in the die is trying to crimp the case mouth into the bullet. If there is no crimping groove this generally results in a slightly bulged shoulder which maked it nearly impossible to chamber in the rifle. I would suspect this may be the problem. To check this, take a sized case that is know to chamber easily in the rifle, out it in the shellholder in your press, raise the ram to its highest point and then screw the seating die down until it just contact the case. Turn it back 1/16 of a rotation and seat the bullet to the proper OAL you want by adjusting the seating stem adjuster, not by turning the entire die down in the press. Go through the steps one at a time and figure out at what point the case is being deformed out of spec. Then correct the problem. Have a good evening, Kirby Allen(50) [/QUOTE]
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7mm RUM reloading difficulties
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