there are several differences between the g2 and encore and the older contender. the main one being if you cock an older contender and lower the hammer..you must break it open before you can recock it.
the g2 and encore did away with this problem.
As Robert mentioned...you can accidently fire them WITH THE SAFTEY SELECTOR OFF..pull the hammer back and drop it and it will fire...but most folks who have contenders...both old and G2...follow the following procedure....
break gun open
load gun
close gun
bring gun to firing position
flip the saftey selector to fire position
cock gun
then fire or don't fire gun
if you don't fire...put the saftely BACK ON
then...lower hammer or squeeze trigger guard to break gun....which drops the hammer ....and even without the saftey...the block stops it from reaching the firing pin....
Is no real biggie...it is common sence to put the gun on saftey before you do anything......even if you have a G2....you might slip and drop the hammer........
The G2 and encore have a different grip angle and trigger...I personally like the older version better..I have small hands...but they both work...angle of grip is different...
Contenders and G2 can handle up to 45k psi on a 30-30 case head and 55k on a 223 case head...depending on backtrust more than psi..but that is a "relative"measure.... 375 win and 45-70 work...as will custom barrels in 444 marlin with factory load levels...and 405 winchester with factory loads levels...just don't hot rod them.
the Encore can handle most factory rounds EXCEPT super short mags, ultra mags and such...ie...hot rounds on magnum sized or larger case heads...
the 7mm stw is out, 300 ultra is out....7mm ssm is out...too much backthrust.....The Encore is strong..but is not a bolt gun...it is still a pivoting lockup...
That said....the 458 win, 375 H&H, etc...300 H&H, 300 Win mag...on down...work fine...
if you want to get a rimfire...stick with the Contender in some form...
Hope that helps...
kw