Unless your chamber has been lengthened, you will have to load short, depending on your bullet profile. Make a dummy round using yoou preferred bullet and load it long, say 1.130. Stick in your guns barrel chamber and see if bullet will spin freely while exerting a small amount of pressure on it. If it don't spin, seated it a little deeper and repeat til it will spin, alas your oal. My load is 3.5gr N320 with 147gr Bayou Bullet, oal 1.135 and PF of 131. Very accurate and smooth. Front sight barely moves. My .02 sense.