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I reload 6.5 CM for my Tikka Tac A1 and primarily shoot Hornady ELD-Match bullets. For every new box of these Hornady bullets, I take 3 random bullets and measure lands distance using Hornady tools. Lands distance from the previous box was within 5/1000 of an inch for 3 measurements using 3 different bullets from the same box. However, I just opened another box (different batch) and now I am getting 30/1000 difference for randomly selected 3 bullets from the same box. Now I decided to measure just bullets' length, OGIVE and weight for these 3 bullets that are producing such difference in lands distance. I was expecting to find a difference between these 3 bullets, but both OGIVE and length are within 3/1000 and two of them are 146.8gr and one is 146.9gr. Does anyone have any idea what is going on? How can 3 bullets that are near identical when measured produce such difference in lands distance reading? I though that it could be me not doing accurate lands measurements. However, I measured lands distance 5 times with a same bullet and my readings were all within 3/1000. Keep in mind that the chamber and barrel are super clean.
Cheers,
Dan
Cheers,
Dan