10-06-2024, 02:08 AM
I think what you are missing is the distance from the shoulder to the ogive.
In my example it only makes a .005" difference and the difference would basically be the jump or where the bullet is in relation to the lands, because the bullet had to be seated further in the longer brass to get the same OAL as the shorter brass used to measure with the gauge. The distance between the shoulder and ogive is smaller.
It is not that important if starting a load for yourself if your jumping the bullet. most people will start .010 to .020" shorter and increase the jump from there, but in reality your starting your Jump at .015 to .025".
But when looking for load data it's my experience that particular bullets generally like a specific window of jump or is at least a good place to start. So knowing your jump and relaying info that way is beneficial.
When seating bullets into the lands that .005" now becomes even more important to take into account.
In my example it only makes a .005" difference and the difference would basically be the jump or where the bullet is in relation to the lands, because the bullet had to be seated further in the longer brass to get the same OAL as the shorter brass used to measure with the gauge. The distance between the shoulder and ogive is smaller.
It is not that important if starting a load for yourself if your jumping the bullet. most people will start .010 to .020" shorter and increase the jump from there, but in reality your starting your Jump at .015 to .025".
But when looking for load data it's my experience that particular bullets generally like a specific window of jump or is at least a good place to start. So knowing your jump and relaying info that way is beneficial.
When seating bullets into the lands that .005" now becomes even more important to take into account.