I used them before and they are great. Like it was said the first two thirds goes in easy then the top of the bullet engages the rifling. I just gave it a wack with my hand and it went right in. I used them all the time until I found the No Excuses brand of conical. In my opinion they are even better and very accurate out of the rifles I use them in. They even come with a money back guaranty and payment can be made after you get them. They are a little pricey, but they are worth it. Here's the site.
http://members.aol.com/noexcusesb/