whether you get the 2tube 909, or the 909S. Check out the post on hollowpoint testing right below this one.
As far as power-tuned SamYangs go (I highly suggest getting a power done to your 909): you get a bit more power with the tuned 909S, and it is probably a better choice if you will be wanting to hunt with very heavy boolits a lot. Many will say they like the aesthetics/balance of the 909S better than the 909.
The 2tube 909 gets a lot more shots at consistent velocity, that will be more useful for target shooting/plinking, and plenty powerful enough for hunting deer/predators. Pick your poison. The correct fill pressure for the boolit you shoot can make a lot of difference.
Here are some numbers from my tuned 2tube 909, along with a friends stock 2tube 909. I haven't confirmed these numbers with the chrony at my standard 10 feet from the muzzle yet (doing that today, whoops, actually tomorrow as it just started hailing), but they appear to be accurate. I will correct this post should I find out otherwise.
Hornady .457RoundBall
3000psi
886.3=249fpe
874.3=242fpe
859.3=239fpe
Hornady .457RoundBall
3100psi
873.2=242fpe
865.3=237fpe
843.9=226fpe
Hornady .457RoundBall
3200psi
870.4=240fpe
876.6=244fpe
858.1=233fpe
BigLube ROA's 210grains approx BHN9 alloy
3000
767.4=274fpe
773.1=278fpe
764.7=272fpe
744.9=258fpe
BigLube ROA's 210grains approx BHN9 alloy
3100psi
743.3=257fpe
771.2=277fpe
769.5=276fpe
758.7=268fpe
BigLube ROA's 210grains approx BHN9 alloy
3150psi
748.6=261fpe
773.6=279fpe
775.3=280fpe
767.8=274fpe
BigLube ROA's 210grains approx BHN9 alloy
3200psi
750.6=262fpe
780.9=284fpe***
780.8=284fpe***
758.4=268fpe
Sure Fire Raptors (?215-220grains?)
3000psi
735
742.6
743.1
Lee ROA's 220grain (from BHD)
3000psi
744.6=270fpe
764.8=285fpe
751.6=276fpe
730
Big Lube PRS 255grain .452 (to small)
3000psi
669.8
686.4=266fpe
699.7=277fpe
689.8=269fpe
245grain REAL's from BHD, labeled ".457 un-sized"
3000psi
706.1=270
712.8=276
715.7=278
695.9=263 (this REAL was from a different batch)
Lyman Maxi Hunters 255grains (only had two)
3200psi
673.3=256fpe
696.7=274fpe
693.4=272fpe (this third shot was a .452 PRS 255grain)
My friends' stock (older) 909.
http://i181.photobucket.com/albums/x65/butcher45/EnergyChart-1.gif