As Pdog stated, the trigger will not dramiticly change the group size, if you shooting big groups with that trigger then you would shoot big groups with a 2oz benchrest trigger. You say that bullets are strung all over the target, a trigger problem would show up, as the group shifting to the right (On a right handed shooter.) and possibly lower. What you are more likley experincing is shooter error. The problem I find when shooting a heavy trigger is when pulling the trigger you can see the cross hairs of the scope walk over, when you see this you release the trigger and try again. It is possible to shoot great groups with the gun just as it is. (been there, done that, have the t shirt to prove it.)

You may have developed a flinch, from shooting heavier calibers, or have little experince shooting a rifle. One of the biggest causes of accuracy problems is the scope, just because it is new, or a certain name brand doesn't mean that it is good. What are you shooting off of? Trying to shoot a small group with the rifle rested over a rolled up jacket, is not going to work out. Switching winds can reek havic on a group, are you using wind flags? It is very possible that you have ammo that the gun doesn't like. So with all of that said No a accu-triger will not help you problem, it may in fact make your problem worse.

What is the average cost of an accutrigger, dont know you dont see them come up for sale often.

Will a accu-trigger fit in a standard trigger short answer is NO.

Can you take the standard trigger to a gun smith and have it safely lowerd to the 2lbs? Yes, if the gunsmith knows what they are doing. Just because someone calls them self a gunsmith doesn't mean they know everything about guns, or can produce quality work. In all reality you can do this your self, it is not a hard chore to do. Use the search feature, and do some research, you will find information on how to adjust your trigger.