A motor having an efficiency of 88% operates a crane having an effieciency of 42%With what constant speed does the crane lift a 410-kg crate of machine parts if the power supplied to the motor is 5.5 kw?
I would say no, although I have had aluminum casings split down the side, get stuck in the chamber and the extractor take a bite off of themThat`s why I only shoot brassHopes this helps and happy shooting!!!!!!
Power available for Lifting 5.5 0.88 0.42 2.0328 kW 2032.8 W Power F.v 410 g v 2032.8 v 2032.8 / (410 9.8) 0.506 m/s
Quite frankly, even if they ARE harder on the extractor the cost savings will pay for a new one in short orderExtractors for my 1911 run about $30, so as long as I save $30 per extractor's-worth of ammo I'm on the up sideBut I reload, so I'll never buy the stuff :-)
As a Gunsmith I can tell you that NO, aluminum casings are not harder on your extractor than brassExtensive research was done by the military in the early 60's in an attempt to find a cheaper alternative to brass bullet casesThey found in pistol cartridge cases that aluminum would work, but the failure rate was higher than brassBrass has perfect qualities for bullet casingsAluminum absorbs/disapates heat easier, but the cases split open and in high power rifle cartridges the aluminum case failure rate was just over 20% making them unacceptable for military use in high rate of fire weaponsA stuck case in an M-16 or Machine Gun meant lives lostThe final report was issued thru Aberdeen Proving grounds in Maryland in the fall of 1969 after 3 years of intensive testingBrass came out the winner in all of these tests so alternative metal searches and research stoppedCCI Corporation developed an aluminum 9mm round and a .38 Special round called BlazerIt was never really popular and never got off the groundIt had other limitations as the aluminum cases were un-reloadableThe factory Blazer rounds just couldn't be loaded to +P or higher modern powder loads.
When it comes to cartridge cases or anything else for that matter aluminum is not harder than anythingThe design of the auto pistol is such that even a titanium case would not damage the extractor unless you dropped it in the chamber and let the slide go shut on itDuring the loading sequence the cartridge is slid up the ramp, and the rim of the cartridge slides up under the hook of the extractorIf the slide is dropped on a loaded round, the extractor must bend to engage the rim, and enough bends one break.
