.303 British Maximum cartridge drawing.

[Edward Horton]

Funny thing, that maximum cartridge drawing above. Check out the maximum base dimension.

Moderator.

Please delete Mr. jmoores posting and reduce his post count by 250, Mr. jmoore is drinking CNC cutting fluid "again" and has extremely blurred vision and can't see the SAAMI and British drawing are the same.

Mr. jmoore and Patrick

Please look at the SAAMI drawing again, base diameter of the SAAMI drawing is .4601, .200 forward of this the case diameter is .4554. The drawing from the "Textbook of Small Arms" is "maximum" allowable dimensions and is in the section of the book on "gauging" the Enfield, the base diameter in this British drawing is .460 or .0001 smaller than the American SAAMI drawing.

You are talking about one ten thousandths of an inch difference or 2.54 microns.

[Patrick Chadwick]

Yep, it's way too fat.

That illustrates what I mentioned before - take a drawing, copy the dimensions, make a couple of mistakes, round a couple up or down - and hey presto! - we're all arguing our socks off about dubious numbers.

It bears repeating: do not blindly trust derivative drawings! Even the drawings in LOCs can be a bit odd. Witness the Martini-Hanry case drawings!

Patrick

[Edward Horton]

Try drinking some coffee, use some eye drops and try using a LARGE magnifying glass.

(what are the chances of two people drinking CNC cutting fluid at the same time in the same Enfield forum)


Gentlemen, SAAMI = .4601, British drawing = .460
(I wonder if they are both putting grease or oil on their glasses and are suffering from excess eye thrust)

[Patrick Chadwick]

Hmmm 2.54 microns Ed, OK, maybe I'll let it go!

Patrick

[Edward Horton]

Mr. jmoore and Patrick Chadwick

The only reason I corrected both of you on the base diameter is because I got it wrong once myself when reading this very same SAAMI drawing and Parashooter corrected me about it. To make up for my shame and guilt I corrected both of you.

(but I got two for one)

[ireload2]

If you will carefully look at Parashooter's original posting you will notice there is a small triangle "flag" by the .4601 head diameter. Then check the notes at the bottom of the drawing. The flag note indicated by the triangle says that the .4601 is a reference dimension. That means the dimension is derived from other toleranced and some times basic (untoleranced) dimensions on the drawing.
IOTW discussion of the .0001 difference is a time waster.
The .4601 is provided for reference only and is not an inspected dimension.

[jmoore]

Doesn't take much to set y'all off, now does it?