|
“I think he is trying to warn you about case head support”
Case head protrusion is unsupported case head, back to “Who measures?” Again, the case head thickness of WW11 surplus 30/06 is .200” (for the most part), Remington (R-P) commercial 30/06 is .260”, back to “Who measures?”. The standard response when discussing surplus brass, on the Internet, is “It is heavier”, heavier is only half correct, the case head is thinner by .060” thinner, deductive reason should suggest the extra weight is in the case body, meaning the case head is heavier meaning the case body is thicker.
A thinner case head lengthens the powder column, a thicker case body decreases the diameter of the powder column.
And out of curiosity, who measures the diameter of the case head, turns the case around and places the case in the chamber when determining case head support. Back to case head thickness, there is an advantage when using R-P brass over surplus brass.
F. Guffey
Unsupported case head on the 03 and M1917, from the bottom of the extractor cut to the case head is .090” meaning both the 03 and M1917 have more case head support than the Mauser, On the Internet, there are claims .175” unsupported case head is acceptable? Back to “Who keeps up with this stuff?” With .175” unsupported case head when using a LC 30/06 case there is only .025” of the case head that is supported.
Then there is the .7854 factor, a heavy load created by what ever mistake will crush the case head, when the case head is crushed the amount of unsupported case head will increase.
|