I can hold an inch at a hundred with my T a friend shot it as well and clover leafed a 3 shotter, as Jim said lots of variables here as you just say scope we do not know how it is mounted or type of scope is it one of those "No drill mounts".
Have you had the rifle for a while or is it just a recent addition, what is the condition of the bore, cond of the draws, are all the screws tight meaning the front trigger guard screw including the inner barrel band, butt screw as well, head space is this correct etc.
Have you walked the scope round the target to see if it is tracking correctly or is it a brand new scope just purchased or came with the rifle.
What load are you using most of us here use the 174SMK's as with any rifle they can show preference how many loads have you tried with it I used to use 2208 (Varget) but get better results with 2209 (H4350) as it burns more progressively, primers, cases used do you crimp the rounds some do some don't.

Have you let someone else shoot the rifle and if they did what were their results!
Cheers.