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Rifles, Reloading, Optics, Equipment
7mm STW
Questions regarding properly sizing belted cases
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<blockquote data-quote="Tidesloe" data-source="post: 802371" data-attributes="member: 47761"><p>Thanks for the input guy's. I'll keep a close watch on any variables that can lead to concentricity issues, and eliminate, or minimize.</p><p></p><p>I've been loading for 300 RUM for about a year, and have not had the concentricity issues with it, which is the reason I'm wondering if my dies are the problem. I dont use an expander ball (one of the variables I've already eliminated). I'm using a sinclair expander die to keep consistent neck tension, and so far this has not caused any problems. I do have a question though. In an effort to produce perfectly concentric ammo I tried rotating the case numerous times during sizing with a Redding type S neck bushing die. This gave me concentric necks, but the accuracy was not as good as necks that were not rotated, and sized in one step, but not as concentric.</p><p>My question is can rotating TOO much during sizing give inconsistent neck tension, which would lead to decreased accuracy?</p><p>I shot this STW for the first time Tues afternoon, right as a winter storm was blowing in so I didn't shoot much. 2 - 3 shot groups, with ammo from McWhorter. This thing ROCKS! I've never shot a rifle like it before. At 200 yds, 4 of the 6 shots were touching. The other 2 were right there as well but opened up to about 1". This was with virgin never fired brass.</p><p>My thought has been to neck only size for 3 firings, and have custom die made to minimally size cases, and improve concentricity problem. Would that be worth it?</p><p>I have a standard RCBS FL die,, and a Redding competition bushing set. I seem to have problems with both.</p></blockquote><p></p>
[QUOTE="Tidesloe, post: 802371, member: 47761"] Thanks for the input guy's. I'll keep a close watch on any variables that can lead to concentricity issues, and eliminate, or minimize. I've been loading for 300 RUM for about a year, and have not had the concentricity issues with it, which is the reason I'm wondering if my dies are the problem. I dont use an expander ball (one of the variables I've already eliminated). I'm using a sinclair expander die to keep consistent neck tension, and so far this has not caused any problems. I do have a question though. In an effort to produce perfectly concentric ammo I tried rotating the case numerous times during sizing with a Redding type S neck bushing die. This gave me concentric necks, but the accuracy was not as good as necks that were not rotated, and sized in one step, but not as concentric. My question is can rotating TOO much during sizing give inconsistent neck tension, which would lead to decreased accuracy? I shot this STW for the first time Tues afternoon, right as a winter storm was blowing in so I didn't shoot much. 2 - 3 shot groups, with ammo from McWhorter. This thing ROCKS! I've never shot a rifle like it before. At 200 yds, 4 of the 6 shots were touching. The other 2 were right there as well but opened up to about 1". This was with virgin never fired brass. My thought has been to neck only size for 3 firings, and have custom die made to minimally size cases, and improve concentricity problem. Would that be worth it? I have a standard RCBS FL die,, and a Redding competition bushing set. I seem to have problems with both. [/QUOTE]
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7mm STW
Questions regarding properly sizing belted cases
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