6br Vld seating depth question

[Cory porter]

Hey everyone, I just started with 6br and have never messed with oal guages and finding that lands.

I just have a quick question that I didn't know how to word it correct to look it up online.

I am loading up 4 initial different oal. When subtracting say 20 thousands from the lands do you take it from oal or base to ogive.

For example 2.400 oal is to the lands, 1.828 base to ogive with Hornady oal guage. Which number do I use

 

[BoydAllen]

First a question for you. Why do we use base to ogive measurements? (Yes this is rhetorical.)

 

[Cory porter]

First a question for you. Why do we use base to ogive measurements? (Yes this is rhetorical.)

Correct me if I'm wrong, but that is the part of the bullet contacts the lands

 

[BoydAllen]

The ogive is the entire curve at the front of the bullet, from tip (meplat) to where the sides of the bullet become parallel to each other. Comparitors are designed to be caliber specific and make contact at the approximate location on the ogive where it is anticipated that the rifling would make contact. (where rifling marks would occur if the bullet was seated longer than touching. My question was a way of reminding why we prefer to record the ogive to case head dimension of a round. The reason is that the tips of bullets tend to be irregular. More repeatable results are obtained measuring off of the ogive when working with more than one bullet, like you do when resetting a die to produce a specific seating depth. You can start out using OAL while you are working with a single bullet measuring where it touches the rifling. Some methods require this, others do not. Once you have that bullet in a case, loaded to the proper length, you
can take a measurement from the ogive instead of the tip. This is a good idea because you will probably be working with a different bullet the next time that you need to set the die, and its tip may not be the same as the bullet you originally used.

 

[Cory porter]

The ogive is the entire curve at the front of the bullet, from tip (meplat) to where the sides of the bullet become parallel to each other. Comparitors are designed to be caliber specific and make contact at the approximate location on the ogive where it is anticipated that the rifling would make contact. (where rifling marks would occur if the bullet was seated longer than touching.

Makes perfect since. So with that being said use the numbers from the comparator not base to tip

 

[BoydAllen]

Yes, I would. Once you have an ogive to head, bullet touching the rifling length, the only reason that you need to look a OAL is if you are close to magazine length.

 

[Cory porter]

Yes, I would. Once you have an ogive to head, bullet touching the rifling length, the only reason that you need to look a OAL is if you are close to magazine length.

Which is not a concern because it's a single shot

 

[BoydAllen]

Sometimes my answers are not only for the questioner, but also for the lurkers, particularly when it takes little effort.

 

[Lapua40X]

Sometimes my answers are not only for the questioner, but also for the lurkers, particularly when it takes little effort.

Wish that was more commonly understood. Some get into a rut thinking that the responses are personal.

 

[Alex Wheeler]

With a vld, I'd be very surprised if you didnt make it happy between .010" in and .010" off. Go .002" at a time.

 

[gotcha]

With a vld, I'd be very surprised if you didnt make it happy between .010" in and .010" off. Go .002" at a time.

In my rifle this applies to Scenar's as well as VLD's