1,750ft/lbs is possible from a 10" bbl with either a 200g or 240gr jacketed bullet with either H110 or Hodgdon Lil'Gun. 2,000ft/lbs is over the top..... even for a 20"bbl. Due to a number of factors, the heavier bullets will get lower velocities and yeild lower energy figures as relates to ft./lbs. A heavier bullet is more effective due to greater momentum (lb/ft.) But, thats not the issue at hand......
But, who's to know? I seriously doubt that anyones going to chronograph your ammo (besides you).
I'm retired from a state agency that required a minimum of 500ft/lbs of energy for deer hunting for many years.(handguns). To my knowledge, I was the only enforcement officer that ever owned, or knew how to use a chronograph for that matter. (most didn't even know what a chronograph was, save for a "watch" function. We only went by the manufacturers "published" data. At that, only one manufacturer claimed to have a load that met the "minimum" for the .357magnum. (Georgia Arms) But, it in fact did get the claimed velocity, and from my 4" bbl S&W Mod686, at that.....(I personally knew the President/COO and he gave me a box of the loaded ammo for my testing/duty carry-A fellow NRA/PPC competitor) But, we had a "operational policy" that if someone was hunting with a .357mag handgun, that if they were using "magnum ammo" and jacketed softpoint or hollowpoint bullets, to "let it go...". Hence, neither I, nor anyone I knew ever wrote a citation for illegal ammo, in regards to the "foot/pounds" minimum. It was something of a "honor system"....
Like another poster stated, the ft/lbs figure is however a "nebulous" number for determining effectiveness of a bullet/cartridge. I actually assisted as a committee member that wrote the law that superceded the regulation stipulating a ft/lb minimum. Oddly enough, the .357magnum "handguns" were allowed, but .357mag "rifles" weren't legal....... Now, .22cal "centerfire" or larger, with ammo with "expanding" type bullet is allowed. We didn't include FMJ due to over penetration/ricochet hazard and other "issues"...... mostly political..... Yeah, politics! That, and "consistency" with other adjacent states regulations.
I'd be content if you can with a good consience state that the load/bullet combo meets the "Legal" minimum. A .44mag with a decent bullet (ie: a Hornady 240gr XTP, or Speer Gold-Dot, or a cast 240gr or heavier bullet) will certainly with a well placed shot take down any Roe or Red deer that you're likely to encounter on your island.....