Ok I shot the rifle this weekend and it has a substantial kick. But it was a lot of fun. I only got to fire of about 50 rounds and now my shoulder is a bit sore. the accuracy was decent but Im sure that it is a lot more accurate than I can fire it due to the fact that its the first time I have fired a rifle and my trigger pull is quite horrible. Using only iron sights I was able to place tight groups about 1-3 inches at 100 yard but they were all to the right of the target, again due to my noobish trigger pulls. The cycling of the bolt was very fast, which is the usual characteristic of an enfield. I was able to cycle and fire off a round in 1/2 a second. All in all it is a very fun rifle.
The good news-- at least in my experience-- is that if your groups are consistent, then what this probably means is that you are similarly consistent in making whatever mistakes you're making. Thus, once you isolate the error and correct it, you're good to go.
Trigger pull may be a factor, as you mentioned. Novice shooters tend to wrap a little too much finger around the trigger, which can cause a shot to go wide in the direction of the hand pulling it...though I find this a lot more in pistol shooting than rifles, and I'd not expect it to factor much at 100. Just remember:
1) SQUEEZE, not "pull."
2) Just use your fingertip, the bare minimum you need to contact the trigger and move it
3) DO NOT ANTICIPATE THE TRIGGER BREAK, which causes flinching, especially with a bigger bore weapon like yours. When that rifle fires, it should be a surprise. You can work on this whenever you want; just snap in, pick a point somewhere, and practice keeping the front sight steady on the target and you pull the trigger. I recommend spending $3-$4 on a dummy .308 "snap cap" which you can load in the chamber when practicing to save wear and tear on the pin while dry-firing.
The pic you posted suggests someone has shown you the proper basics of snapping-in for firing, and using the sling for support. That helps.
Your problem may also be sight alignment-- that is, how you're lining up the front and rear sight.
Then again, there is certainly no law in the universe that says you can't adjust windage to correct an otherwise natural flaw in how you line up; not everyone lines up on the same weapon in the same way. If all you're doing is shooting to the right, then fire a htree-shot group, apply a couple clicks of left windage (if your sights allow it, that is; mine has a drift adjustment on the front blade sight), and fire three more. That should move you closer to the "X" ring. Once you've applied your own "dope" (as such adjustments are often called) to the weapon, try moving back to 200 or 300 yards if you can. If you find that when doing this-- after making the necessary elevation adjustments, of course-- you're still hitting center mass, your problems are over.