I am new to reloading and so far I have stuck to .223 with 60gr. Nosler Ballistic tips for bullets. My rifles are both 1:9 twist so I could fire a heavier bullet. I am thinking of getting a Stevens 200 bolt action rifle to accurize which also has a 1:9 twist for my .223's. My question is: what is the advantage of using a heavier bullet? Are the heavier bullets more accurate. Since the COL for .223 is 2.50 to just under 2.56, doesn't the bullet protrude into the case too much? Wouldn't this cause too much pressure? So why the heavier bullets?