Originally Posted by Arik

Bullet weight shouldn't matter.

No..

Depending on the twist rate some bullets will stabilize better but the only difference down rang should be more or less accuracy depending on the bullet weight.

No..

If rounds are key holing (hitting sideways) there's something wrong with the barrel.

Not necessarily.

Either the lands/groves were cut wrong, or the barrel wasn't finished or it's the wrong diameter.

Not necessarily.

Could be really bad crown.

NO...lol