I would stick with Speer Gold Dots Or Winchester silvertips, or other Major Brand standard pressure ammo...That Georgia stuff might be too hot or have a longer bearing surface on the bullet, causing higher pressure. The barrel is cut with freebore for a good reason, to reduce pressure..a long bullet will cover more of the freebore and spike pressures, a good reason not to shoot 147gr. I would stick to 115 or 124gr Gold Dots or Silvertips..YMMV.
Mich.