backdoorsally
CGN Regular
- Location
- South East Alberta
Best way to determine distance to the lands?
C.o.l
- Thread starter backdoorsally
- Start date
I just take a fired case, very slightly squish the neck in a vice (to create resistance when bullet gets fitted). Check if the case chambers... then dab a bit of rapid set epoxy on the inside of the neck. Push a bullet in a few mm and carefully chamber. Let the epoxy set and then eject. Measure...
edi
edi
I have smoked bullets and spilt cases, put Bullets in backwards and and soft seated , and z few other ways to check The length I needed to the lands .
These days I simply use a Stony point gauge .
Does the same thing and it fast - one must remember however that the number you come up with is just that , a number.
It's just a starting point .
Cat
These days I simply use a Stony point gauge .
Does the same thing and it fast - one must remember however that the number you come up with is just that , a number.
It's just a starting point .
Cat
Last edited:
I used to use the hornady (stony point) gauge, but then started shooting a caliber that they didn't make modified brass for.
In my search for advice in how to make my own brass for it, I came across this video by Wheeler Accuracy, and have never used my gauge again.
https://youtu.be/TWmIwPwLyyg
Works great, and very accurate.
In my search for advice in how to make my own brass for it, I came across this video by Wheeler Accuracy, and have never used my gauge again.
https://youtu.be/TWmIwPwLyyg
Works great, and very accurate.
The oldest and very easy way is to simply seat a bullet a little long and insert into chamber and close the bolt... did it close hard because of bullet jam... look at the rifling marks and seat it a bit deeper... adjust and try until the bullet is just kissing the lands...
But you can spend money on various tools and methods too.
But you can spend money on various tools and methods too.
First, I size the case neck with a Redding bushing die just small enough that the bullet is only lightly held in place.
I seat the bullet too long so it will slip when the bolt is closed.
If there is not enough neck tension, you will get inconsistent readings.
If there is too much neck tension it can jam hard into the lands and even get stuck.
So find a balance of neck tension that works reliably and identify that case and use that same case every time.
Oh, and this is very important... You want to make sure you do not size the neck all the way to the shoulder. If you do... There is often a donut, or a constriction there, where the neck meets the shoulder. If the bearing surface of the bullet comes into contact with that constriction, it will jam the bullet hard into the lands and mess up your readings. If the neck is only resized about half way down, the donut will be clear and the bullet will seat freely and consistently.
There are other ways where you measure the length of a rod dropped down the barrel and you measure between the bolt face and a seated bullet, but I have never found that to be as reliable as what I stated earlier in this post.
I seat the bullet too long so it will slip when the bolt is closed.
If there is not enough neck tension, you will get inconsistent readings.
If there is too much neck tension it can jam hard into the lands and even get stuck.
So find a balance of neck tension that works reliably and identify that case and use that same case every time.
Oh, and this is very important... You want to make sure you do not size the neck all the way to the shoulder. If you do... There is often a donut, or a constriction there, where the neck meets the shoulder. If the bearing surface of the bullet comes into contact with that constriction, it will jam the bullet hard into the lands and mess up your readings. If the neck is only resized about half way down, the donut will be clear and the bullet will seat freely and consistently.
There are other ways where you measure the length of a rod dropped down the barrel and you measure between the bolt face and a seated bullet, but I have never found that to be as reliable as what I stated earlier in this post.
