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Message: <blockquote data-quote="MoBoost" data-source="post: 1562144" data-attributes="member: 3455">I can take a picture of 338 lapua, 7x57 and .223 - without something to tell you the scale - you will not be able to tell which one it is (223 has slightly different alpha); throw in any other cartridge in there and it will stick out. What it means that there is an optimal caliber/base/length relationship, and apparently Mauser nailed it in early 1890s. If you look at my math 338 Lapua is within 1% off dimensions and 223 is even less - 1% is rather slim brush. I didn't fudge the numbers - what you see is what you get.My point was - 7x57 was a no-compromise pure design, everything else that came after it was a deviation from perfection and compromise with loss of efficiency and diminishing results.Let me give you an example:1) Lets shorten it - we get 7mm-08,  with same loads both cartridges run same speeds, but 7mm-08 does it at 15%-20% HIGHER pressure - inefficiency.2) Lets lengthen it - we get 280, with same loads pressure will be the same but 280 will be 10% behind on speed. Yes you can  push 280 over 7x57, but you'll gain 5% speed with 20% more powder - inefficiency.The further you deviate - the worse your results are: like 7mm mag - 50% more powder for 10% gain.</blockquote>