I'm trying to measure OAL to the lands with 2 different projectiles just for the sake of knowing more and recording more information regarding my handloads. I don't have the fancy equipment required so I have resized and trimmed a case to trim length and have slit the case neck as shown in the picture. I lubed the inside of the case neck and barely seat the bullet then chamber the round and measure. Here are the results:
1. 175 grain SMK ".............2.890"

2. 165 grain SpitZer BT.......2.816"

My question is why such a longer OAL to the lands with the 175 SMK. The projectile appears as if it would catch the lands sooner and seat deeper than the 165 SpitZer... I just want to make sure I'm getting good readings. Can anyone offer some explanation.