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Joined: May 2016
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Hey guys, whether in a 7x57 (7mm Mauser) or .243 win, which case has the greatest powder capacity? Lapua, Remington, Noram? I have both in factory loads but plan on reloading them, or course. Any ideas?

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I don’t know honestly Jim, but I’d guess the Norma has the most capacity.


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That's what I kinda figured. I'm hesitant to pull the bullets on either to check, more trigger time for me! ha Say, did you get your package from me yet?

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Yes sir. Got it. Thank you for the goods!


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Good deal! have a ball Pard!

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I’ve got some Norma 7x57R in the garage. Want me to go measure? If so, how would I do that?

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I also have some random 8x57 Remington (don’t own an 8x57) that I can neck down to 7mm if you would like.

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Thanks Pard, I'm not sure but I would think the rim of your 7x57R would add a bit of weight. I'm also not sure of the 8x57 neck down. When comparing case capacity, I usually just weigh them first, and find the ones that are the heaviest & the lightest. After I size them, primer in, I fill to the case mouth with a fine ball powder and weight the charges of the two. Thats close enough for my uses. I have found some cases that are heavier, yet still close in capacity, depends on how the inside of the case head is made, etc. I am of the personal belief that if one does not have a :bonafide 1/4-1/2" 5 shot grouper rifle, some experiments are pointless. I do, however, stick with loads for one brand of brass. I keep them seperate, usually with a different bullet/purpose. I make good notes and just rezero for them if used for a hunt. Thank you sir!

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I was thinking you wanted to measure capacity. No worries. Let me know if you change your mind. I have 7mm-08 in Nosler, Lapua, Winchester, Remington and Norma. You might be able to make some assumptions on the 243 based on those.


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