I've been shooting the 143 ELDX in my 260 (less than 200 rounds thus far), and I've had great accuracy with them so far. I have noticed some differences in weight ( 142- 143.3) as well as about a .02 variance on the OG measurement. Doesn't seem to effect accuracy much as long as I'm not shooting a 143.3 and then a 142... the closer I can keep the weights, the better they group. haven't seen much difference with the OG measurements.
I have the RCBS gold medal micrometer seating die. If you look the die seats the bullet above the ogive. Off the very tip but close to it. The issue is the distance from the ogive to the tip is not very controlled during manufacture. If you measure the bullet overall length, base to tip. you will find about 0.010" difference in any box of bullets from most manufactures. Depending on where your seating die mates to the bullet this can add variance to your final seating depth. One way to help fix this is to segregate your bullets by length. You check and adjust final seating depth as the length changes. I have found with my die the variance is not worth worrying about but I am not a F-Class or bench rest shooter. I am just shooting to hit a .67 MOA steel target cold bore at 600 yrd plus distances.
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