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Posted: 2/12/2013 4:31:16 AM EDT
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Provided you had a rifle capable of benefiting from match ammo, does case weight play an important part in assembling accurate ammo? For example, if you weighed fifty .308 cases and you got weights anywhere from 164.0 grains up to 169.0 grains. Would that variation in weights make a difference? Or does case capacity make a difference as well?
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| Yes; and it's important how your cases are prepped before they are weighed. 1) size and decap, 2) clean the brass however you normally do, 3) trim to the same overall length. Now you've remove all the variables and are only weighing what matters. Since the outside dimensions of your brass is now all the same any difference in weight reflects a variation in the volume inside the case. |
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Quoted:
Yes; and it's important how your cases are prepped before they are weighed. 1) size and decap, 2) clean the brass however you normally do, 3) trim to the same overall length. Now you've remove all the variables and are only weighing what matters. Since the outside dimensions of your brass is now all the same any difference in weight reflects a variation in the volume inside the case. Interesting. I take the opposite approach. Once fired brass, decapped, cleaned. THEN weigh, and then process those batches individually. Why? Each one of those cases starts life at a specific weight. They are put into a box, and I buy them. I fire them. I take them home, and remove everything but the brass case itself. If you weigh them AFTER you ream the primer pockets, deburr the flash holes, and trim them, then your measurements are not an ACCURATE measurement of the case weight itself, but rather of what's LEFT of the case after you've finished manhandling it. If you spend an extra half a second on one flash hole, or trim one a couple thou shorter than another, or chamfer one a little deeper than another.. ALL those things will affect weight, but NONE of them will affect volume. YMMV, just my $.03 |
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Quoted:
i dont seperate my brass by weight and easily get sub-moa ammo, so it depends how far you want to take it  And that's just it. For 100 yards, or 300 yards, or even 500 yards, it may not matter a whole lot. I mean, being .75MOA at 100 yards is still every shot in the bullseye on a regular target. If you plan to shoot 800 or 1000 yards, you really want everything as tight as you can possibly get it. Please note that I do NOT put this much work into every round I load... But for my GOOD 308 bolt gun.. Yeah, it's worth it to me. |
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Quoted: Quoted: Yes; and it's important how your cases are prepped before they are weighed. 1) size and decap, 2) clean the brass however you normally do, 3) trim to the same overall length. Now you've remove all the variables and are only weighing what matters. Since the outside dimensions of your brass is now all the same any difference in weight reflects a variation in the volume inside the case. Interesting. I take the opposite approach. Once fired brass, decapped, cleaned. THEN weigh, and then process those batches individually. Why? Each one of those cases starts life at a specific weight. They are put into a box, and I buy them. I fire them. I take them home, and remove everything but the brass case itself. If you weigh them AFTER you ream the primer pockets, deburr the flash holes, and trim them, then your measurements are not an ACCURATE measurement of the case weight itself, but rather of what's LEFT of the case after you've finished manhandling it. If you spend an extra half a second on one flash hole, or trim one a couple thou shorter than another, or chamfer one a little deeper than another.. ALL those things will affect weight, but NONE of them will affect volume. YMMV, just my $.03 Very interesting observation. |
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