Not at all,however I believe that to compare the size differences between the 338 Federal and the 338win mag to the difference in size between Arnold Schwarzeneggar and Danny De Vito is completely ridiculous.
If asked to think back and remember if they saw Arnold Schwarzenegger or Danny De Vito,most people would have no problems recalling which person they saw.
The person that started this thread remembers shooting a gun chambered for a .338" cartridge,but he is unsure of which .338" cartridge.Now if asked to think back about a cartridge which he only saw briefly on one occasion,how many people do you think could remember if the case was 2" long or 2-1/2" long?Would it not be easier to remember if the case was belted?I know for me that it would be easier to remember if it had a belt than to try and estimate the size when the two only vary by 1/2".And the presence or absence of a belt does 100% rule out one cartridge or the other.Can you be 100% sure when trying to remember if the case was 2" or 2-1/2" long?