Crown over crossed flags and DCP is Dominion of Canada Proof. This marking was applied only after the rifle had been factory-tested by Canadian Government Inspectors with a massive overload. Working pressure for the M-10 with .303" ammunition was 18.5 ILT per square inch: 1 ILT (Imperial Long Ton)= 2240 psi, so the working prssure is 18.5 x 2240= 41,440 psi. Exactly the SAME action (they were built as actions an finished as whatever was required at the time) was appoved for a working pressure of 28 ILT (62,720 psi) when operating with the .280 cartridge. What actual pressure the action CAN handle has never been determined: Ross tested the 1905 action at 125,000 and said that he had tested the far-stronger 1910 at 150,000.
Funny about the recoil. Personally, I find the Ross to be relatively mild as to recoil, although I find the Kar 98k most unpleasant and the P-'17 to be utterly brutal. When shooting Lee-Enfields, I find that my "proper" fit is with a Normal butt, although the Short feels more comfortable.
Rifle-to-shooter "fit" is extremely important. What utterly AMAZES me is that the British have known about this, and done something about it, for more than a CENTURY..... while the rest of the world has sat by and gawked at those silly Brits and their stupid oddball-length stocks.
Funny, God might have made all men EQUAL..... but He sure didn't make them all the same HEIGHT.
Time the rest of the world woke up and realised this tiny, small, itty-bitty, insignificant little fact.
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