Call Sinclair supply. Those guys are top notch and will tell you exactly what you need to buy. My equipment is Stoney Point, but I believe Hornady bought them out??

Overall length IMO is not an important measurement. I prefer the distance to the Ogive. This measurement is what really counts, and is more consistent. Sinclair sells a small ring that fits down over the bullet and allows you to measure the length to the Ogive. I prefer that tool.

As far as touching the lands. I will admit that most of my rifles shoot better when touching the lands. But it is not always the case. Tom.