My question is, there are 2 places on a bullet that make contact when seating and chambering.
1 - The place on your bullet that your seating die (seating stem) contacts.
2 - The part of your bullet that makes contact with the lands.
Some people believe that since bullets are not perfect and can be different lengths, that because of this when seating to just touch the lands there will be differences that will make some bullets in the lands some out of the lands and others just touching. I believe that there could be or is a difference in the amount of contact with the lands due to bullet variances. I believe that the difference between bullets that could effect this is the difference between where your seating stem seats from and where your bullet actually makes contact with the lands. To see if this is right I did a small check on some bullets I have 30-caliber (175gr SMK’s moly). I have a Sinclair comparator nut, which has different size holes for making measurements. I first measured the bullets using the comparator in the 30-caliber hole then I measured using the 22-caliber hole. The 30-caliber hole represents the part of the bullet that would contact the lands and the 22-caliber hole represents the seating stem for my test. If I understand this right for all the bullets to be seated to just touch the lands the distance between these measurements would have to be the same? What I found was that there was as much as .004 difference between these measurements only measuring 5 bullets. So how do you seat bullets to just touch the lands or be off the lands by a set amount if there is a variance in the bullets between where the seating die seats to and where the bullet actually contacts the lands? Hope this makes sense and hope I used correct terms.
1 - The place on your bullet that your seating die (seating stem) contacts.
2 - The part of your bullet that makes contact with the lands.
Some people believe that since bullets are not perfect and can be different lengths, that because of this when seating to just touch the lands there will be differences that will make some bullets in the lands some out of the lands and others just touching. I believe that there could be or is a difference in the amount of contact with the lands due to bullet variances. I believe that the difference between bullets that could effect this is the difference between where your seating stem seats from and where your bullet actually makes contact with the lands. To see if this is right I did a small check on some bullets I have 30-caliber (175gr SMK’s moly). I have a Sinclair comparator nut, which has different size holes for making measurements. I first measured the bullets using the comparator in the 30-caliber hole then I measured using the 22-caliber hole. The 30-caliber hole represents the part of the bullet that would contact the lands and the 22-caliber hole represents the seating stem for my test. If I understand this right for all the bullets to be seated to just touch the lands the distance between these measurements would have to be the same? What I found was that there was as much as .004 difference between these measurements only measuring 5 bullets. So how do you seat bullets to just touch the lands or be off the lands by a set amount if there is a variance in the bullets between where the seating die seats to and where the bullet actually contacts the lands? Hope this makes sense and hope I used correct terms.