Morning Jasperold7
T3 or T3X shoots MOA straight out of the box with most factory ammo; sub 1/2 MOA if reloading.
Just a thought! If using scope "glass optics" then any model of .223 is fine. However, if using a Thermal of Digital scope, these are substantially mounted higher on the rifle and to achieve a decent "cheek to stock and eye relief" an adjustable stock "cheek piece" is an advantage and is found on the T3 "super varmint" stainless steel model; on sale SGC @ £1255.
Ensure the T3 magazine is the latest "modified metal" one; the plastic magazines are trouble in .223 calibre, but are replaced free of charge with "Modified Metal" ones by GMK under warranty - 3 years..
Good luck with purchase.
Royr