Talk:Delta L problem

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[edit] Unsafe combinations and Delta L problem

Hi Francis (and others). I am looking in more details at the -- Unsafe combinations -- paragraph in the C.I.P. article. If we take the .30-06 Springfield for example, we see the dimension we call L2 is 2.109 inches (53.569 mm). This value given there, is it the SAAMI value ? Is it the maximum length ? CIP gives 56.560 mm for the maximum. There is 9 µm difference, do you know where this difference is coming from ? --Michel Deby (talk) 11:03, 12 January 2008 (UTC)

Hi Michel,

I get the impression you think I am a US citizen, but actually I am from Europe. In daily life I sometimes have to deal with C.I.P. decisions/standards, when handling rifles in one of the C.I.P. member states or discussing sports and hunting arms with friends living in C.I.P. regulated countries. I can not help on L2 differences between the .30-06 Springfield article drawing and C.I.P. drawings/tables. Cartridge drawings in Wikipedia will be uploaded by Wikipedia contributors. I also uploaded some unofficial cartridge diagram drawings, but can not guarantee their correctness (like everyone I can make mistakes, C.I.P. can decide to change dimensions etc., or other editors can change things without me knowing). As a minimal safeguard I tend to add links to the current online version of the C.I.P. decisions, texts and tables on the C.I.P. website. Wikipedia and other general encyclopedias are not good sources for obtaining reliable firearms related critical dimensions and specifications. It is good practice to at least double check critical information. I think a lot of dimensional problems with cartridges have to do with incorrect/inaccurate measurement conversions. Even for professionals it is not easy to think in measurement systems one is not totally accustomed to.

Francis Flinch (talk) 11:13, 13 January 2008 (UTC)

Hi Francis, Yes I though you were in the US ! You seem to know the business quite well, also over there. --Michel Deby (talk) 17:02, 13 January 2008 (UTC)