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Looking through my copy of a 1930 Jeffery catalog, I came across their page dedicated to the Jeffery's .600 Bore.

The text reads, " We recommend the Under Lever Push forward Snap Action, as shown in this illustration, for all powerful Smokeless Powder Rifles." I have been aware of this representation by Jeffery for some time, but have never understood what they were talking about.

There is a German action, called the "System Roux", which appears to be identical to the top lever double underlug actions, except that it is activeated by an under lever rather than a top lever.

If this is the case with the Jeffery, then why should they write "It is a far stronger Mechanism than the Top Lever, and it admits of nearly ten times as much pressure being applied to withdraw the bolt as can be got from a Top Lever" and "The cocking, opening of the Breech, and ejecting of the fired cartridge cases are much easier with the Under Lever Snap Action than with the Top Lever."? I can't see why cocking, opening the breech or ejection should have anything to do with the location of the actuating lever, unless actuating the underlever cocks the hammers in addition to unlocking the breech.

The price, incidentally, was 110 Pounds. (Which translates to about $9939, allowing for exchange rate and inflation. Pretty good buy!)

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I think what they mean is that if the pressure rises (cordite+high temp) and the brass sticks to the chamber plus the flex of the action it would be much more easy to use the strength of your hole hand and arm not just the thumb to whitdraw the locks.
Makes sens actually, you have more strenght just pushing your arm forward agains your other arm then using your thumb. And then when the thumb is not enough, change the grip and push it with the "muscle part" of the thumb.
I think it would also be more easy to whitdraw the cases with the one hand on the on the under-leaver pushing agains the other, and perhaps the stock put in the armpit. Instead of when finaly got the toplever to move sideways change the grip to add more strenght to the break.

Finaly i think that they write that it cocks with the push of the arm, but will when time is given check it up. If so this would be one more thing to overcome when breaking the rifle.
And the price, if i can remember right, (cant remember the year) was on the ,600 50 pound for the PH-grade and if you didnt want he ejectors 45 pound.
Damn, I realy, realy wanted to be born 100years ago

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Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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