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My new .300 RUM
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<blockquote data-quote="Brent" data-source="post: 7312" data-attributes="member: 99"><p>25-06,</p><p></p><p>I'm shooting 90gr Retumbo under the 200gr Accubond and all I can say is that it shoots great in this sporter I have. </p><p></p><p>Are you sure you didn't get the dent from too much lube when sizing the case? Dented or collapsed? Outside diameter of the neck before seating should be no more than .003" - .004" less than it is after the bullet is seated, for a press fit of that much. .002" is what I use, but My die uses neck bushings, so I do have better control of it than you may. Excessive press fit, lack of a mild champfer is the only thing I can think of that would collaps and round shoulders tho.</p><p></p><p>My loads OAL is 3.660", as long as the mag box will allow.</p><p></p><p>After you fire the cases once, you can partial full length resize (P-FLR), but you need a neck sizing die to just size the neck and leave the body alone. </p><p></p><p>To P-FLR cases, run the FL die down to the shell holder and back it off a turn or so, enough that when you size a case, the case will not chamber in the rifle. The reason it won't chamber in the rifle now is that the body has been squeezed in and the shoulder has actually moved forward as the brass worked forward. The die is too far up to make contact with the shoulder when it's sized, at this point this is what you want. Now that the case is too long to the shoulder at the datum line, adjust the die down 1/16th turn at a time until the case just chambers in the rifle with not too much effort on the bolt. Remember to lube the case each time you run it back in with the die a little lower or <img src="http://images/icons/shocked.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> . What you want, and are trying to achieve, is a case that is forced against the shoulder and the boltface with zero headspace and is thus centered up in the bore perfectly, just allowing you to close the bolt.</p><p></p><p>You can monitor the headspace length with a Stoney Point tool or just use an empty 44 Mag case slipped over the shoulder to measure it. The length to the shoulder on your once fired cases will probably be a little shorter than the number your looking for (a thou or two). </p><p></p><p>What you're trying to do is to keep the cartridge from laying on the botttom of the chamber by forcing it up tight against the shoulder which will center it up, this way there is clearance between the neck and the chamber all the way around, and the bullet is thus centered to enter the bore perfectly when fired. </p><p></p><p>Properly set up this way, headspace will always be the same from one loading to the next, not getting tight after a couple as it will with only neck sizing, thus requiring a run through the FL die, which will possibly change the way it shoots when you do. </p><p></p><p>If case neck runout becomes a problem, and it easily can if you neck size, P-FLR or FL sizing will eliminate it or almost completely do so, neck sizing will not, and can multiply it as well.</p><p></p><p>Good luck this season. <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 09-29-2003: Message edited by: Brent ]</p></blockquote><p></p>
[QUOTE="Brent, post: 7312, member: 99"] 25-06, I'm shooting 90gr Retumbo under the 200gr Accubond and all I can say is that it shoots great in this sporter I have. Are you sure you didn't get the dent from too much lube when sizing the case? Dented or collapsed? Outside diameter of the neck before seating should be no more than .003" - .004" less than it is after the bullet is seated, for a press fit of that much. .002" is what I use, but My die uses neck bushings, so I do have better control of it than you may. Excessive press fit, lack of a mild champfer is the only thing I can think of that would collaps and round shoulders tho. My loads OAL is 3.660", as long as the mag box will allow. After you fire the cases once, you can partial full length resize (P-FLR), but you need a neck sizing die to just size the neck and leave the body alone. To P-FLR cases, run the FL die down to the shell holder and back it off a turn or so, enough that when you size a case, the case will not chamber in the rifle. The reason it won't chamber in the rifle now is that the body has been squeezed in and the shoulder has actually moved forward as the brass worked forward. The die is too far up to make contact with the shoulder when it's sized, at this point this is what you want. Now that the case is too long to the shoulder at the datum line, adjust the die down 1/16th turn at a time until the case just chambers in the rifle with not too much effort on the bolt. Remember to lube the case each time you run it back in with the die a little lower or [img]images/icons/shocked.gif[/img] . What you want, and are trying to achieve, is a case that is forced against the shoulder and the boltface with zero headspace and is thus centered up in the bore perfectly, just allowing you to close the bolt. You can monitor the headspace length with a Stoney Point tool or just use an empty 44 Mag case slipped over the shoulder to measure it. The length to the shoulder on your once fired cases will probably be a little shorter than the number your looking for (a thou or two). What you're trying to do is to keep the cartridge from laying on the botttom of the chamber by forcing it up tight against the shoulder which will center it up, this way there is clearance between the neck and the chamber all the way around, and the bullet is thus centered to enter the bore perfectly when fired. Properly set up this way, headspace will always be the same from one loading to the next, not getting tight after a couple as it will with only neck sizing, thus requiring a run through the FL die, which will possibly change the way it shoots when you do. If case neck runout becomes a problem, and it easily can if you neck size, P-FLR or FL sizing will eliminate it or almost completely do so, neck sizing will not, and can multiply it as well. Good luck this season. [img]images/icons/smile.gif[/img] [ 09-29-2003: Message edited by: Brent ] [/QUOTE]
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