Your statement makes no sense. Did you intend to say, "The secret to the Omega's oustanding acuracy is the T/C tight bore."? If not, I don't understand. If so, how do you explain the White System's excellent accuracy with a slip fit bullet? The range rod weight is enough to seat a conical. I have tried .5040 and .5045 diameter conicals in 300 gr up to 620 grains. They all shoot excellent and powder charge does not matter. I and others shoot anywhere from 70 to 120 gr of powder. I personally have shot without a wad, with a wad and with cornmeal. Not muchof a difference. Sabots also shoot excellent. They take a little more pressure to seat, but are definitely not tight.