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Long Range Hunting & Shooting
338/375 ruger finished
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<blockquote data-quote="yorke-1" data-source="post: 1477556" data-attributes="member: 11960"><p>Here's how I'd do it using dies that I have on hand. Remove the expander ball and decapping assembly from all of the dies.</p><p></p><p>1) Adjust a 338 RCM die so that it will just touch the shoulder on a piece of 7 LRM brass and tighten the lock ring on the die. Now back the die off a couple turns.</p><p>2) Take a piece of 375 Ruger brass and very lightly lube the case with a lanolin based case lube and run it into the 338 RCM die so that it sizes the entire neck down and just kisses the shoulder at the top of the press stroke. The die will be threaded out of the press by a few turns.</p><p>3) Turn the die in 1/4-1/2 turn into the press and rotate the case 180° in the shell holder and run the case all the way into the die.</p><p>4) Repeat this until you've pushed the shoulder back to the appropriate position for the 7 LRM chamber. Now you have a 338 LRM.</p><p>5) Run the 338 LRM case into a 300 RCM die adjusted to just touch the shoulder.</p><p>6) Run the 300 LRM case into a 7mm WSM, SAUM or any other 7mm die you have around.</p><p>7) Make one final pass into the 6.5 LRM die.</p><p></p><p>From there I'd try and a run a 6.5 mm expander mandrel like a Sinclair or K&M into the case to even out the inside of the necks. Now outside neck turn and anneal and you should be good to load and shoot. I' probably try going from 300 down to 6.5 just to save a step. I've done it many times forming 260 brass from 308, but those necks were a lot thinner.</p></blockquote><p></p>
[QUOTE="yorke-1, post: 1477556, member: 11960"] Here's how I'd do it using dies that I have on hand. Remove the expander ball and decapping assembly from all of the dies. 1) Adjust a 338 RCM die so that it will just touch the shoulder on a piece of 7 LRM brass and tighten the lock ring on the die. Now back the die off a couple turns. 2) Take a piece of 375 Ruger brass and very lightly lube the case with a lanolin based case lube and run it into the 338 RCM die so that it sizes the entire neck down and just kisses the shoulder at the top of the press stroke. The die will be threaded out of the press by a few turns. 3) Turn the die in 1/4-1/2 turn into the press and rotate the case 180° in the shell holder and run the case all the way into the die. 4) Repeat this until you've pushed the shoulder back to the appropriate position for the 7 LRM chamber. Now you have a 338 LRM. 5) Run the 338 LRM case into a 300 RCM die adjusted to just touch the shoulder. 6) Run the 300 LRM case into a 7mm WSM, SAUM or any other 7mm die you have around. 7) Make one final pass into the 6.5 LRM die. From there I'd try and a run a 6.5 mm expander mandrel like a Sinclair or K&M into the case to even out the inside of the necks. Now outside neck turn and anneal and you should be good to load and shoot. I' probably try going from 300 down to 6.5 just to save a step. I've done it many times forming 260 brass from 308, but those necks were a lot thinner. [/QUOTE]
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338/375 ruger finished
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