Welcome to the Forum!
As noted above,, we have given you a few different options to consider. Since you are new,, we don't know of your abilities,, how you hold the gun,, your sight picture,, range,,, type of ammo,,,one handed vs two handed,, etc. You see, there are a lot of variables to consider.
So,, w/o all this,, and wanting to help you w/o you having to spend a lot of money on trying different things,, I'll offer this. Get a friend who is experienced in shooting big bore SA handguns. Have them try the gun with your ammo,, and at the range you are trying. If both of y'all get the same results,, then it's something with the gun,, not you.
Next,, as noted above,, if your front sight has a pinned in blade,, it can be replaced fairly easily with a higher one. If it's a totally welded on front sight,, then a trip to Ruger would be in order.
All that is assuming the ammo you are using is in the "normal" standards for that gun. Remember,, Ruger tests their guns with factory ammo,, that's a standard for that caliber. Basically a 240 grn jacketed bullet. And,, as noted they shoot at a shorter distance than the capabilities of the gun.
So,, before you blame the sights,, the ammo, the gun,, etc,, get a second or third opinion. THEN check other things,, one at a time to see if something changes. Lastly,, a call to Ruger will get you some help.