Being a very accurate off-hand shot is nothing but pure luck.  The more you practice, the luckier you get.   Tim  

Like Tim said A good fitting rifle and a lot of trigger time. I have a newly aquired mod 72 beretta 22lr  the more I practice the more i get into the black. With me its a rythem.
Tom

Good start would be reading David Tubbs book. 

He is a strong advocate of approach shooting offhand. Settle off the target swing in and break the shot.   Everybody has a different wobble area some large some small but few are able to hold the rifle steady on target.  If you can get the timing down and have good trigger control it's possible to shoot very good scores even though you can't hold the rifle on target.

Of course that's not all there is to it, good solid positon, well fitting rifle,  as well as a consistent mount routine are important too. But none as important as trigger control and breaking the shot when the rifle is on target.

Boats

focus focus focus, opps!!!! stray thought

I have to honestly say.... I really don''t know!

dave

I like what Cat Whisper stated. It takes loads of practice, but it also takes good habits at the range. These habits are thing's he mentioned such as controling your breathing, control of your trigger finger, and control of how you hold your weapon. I shot expert for years with m14 and m16 rifles that were so worn out we were lucky to hit anything. Navy Seabee's are known for doing more with less and have been for years. Our greatest help was the fact that each unit had several Marines in charge of our weapons training and those Master Gunnery sergeants are folks that you learn to listen to. I actually saw our Gunny walk right up a LTJG's back side while said LTJG was lying in the prone position at  our range,  and our Gunny stood on him to get him to do what he wanted. JG was not a happy camper but did learn how to shoot. 
What I'm getting at here is that if you want to do really good take the time to really go shooting. We burned up about 1-3,000 rds per month years ago for our senior troops in some outfits. Other outfits barely had enough ammo to qualify at the range, and the overall scores showed it. More ammo means a chance at a higher score. That is why when you pick a rifle to shoot competitively pick something in some caliber that will not beat the tar out of you every time you pull the trigger. 
Now this is not to say that if you don't burn up large volumes of ammo you are not getting anywhere. But historically if you were to ask any major competitor in any shooting sport such as trap & skeet, or what ever it takes practice with lots of ammo. 
Hope this info helps
Happy Days at the range.
Mike

Hi Biggie, is that an original rifle or a reproduction, it is a nice one from what I can make out in the pictures.
Excelllent shooting.
Mike