Re: Help sighting in
You may already know this, but it is worth mentioning anyway. If your 30-30 has a band over the barrel, then you need to let the barrel completely cool down between shots. Since the barrel is not floated, it will make contact with other metal on the gun as the barrel heats up. This can change how the barrel vibrates when fired, and can throw your bullet off as much as 4" - 6" at 100 yards. Accuracy is all about consistancy. The only way to be sure that a non-floated barrel vibrates exactly the same way shot after shot is to let the barrel completely cool down between shots.
Have you ever sighted your rifle in with 4 out of 5 shots hitting the target in a nice group, but 1 out of the 5 shots flew way off to the left or right? That flyer was caused from the barrel's contact points changing as the barrel heated up, which made the barrel vibrate differently. If you let the barrel cool down between shots, you can avoid those frustrating flyers.