Help with the concept of 'chasing the lands'

[fguffey]

Here is my question - what is your procedure for chasing the lands? I understand seating the bullets a little longer to account for the wear, but do you adjust your powder charge each time? Of course it wouldn't make sense to redo load development each time, and wear the barrel out even quicker. How do you determine the ratio of adding powder for each corresponding change in COAL as you chase the lands? Doesn't the pressure change each time and throw you off your node?

There is no one on this forum that has a remedy, that is obvious but there were reloaders/smiths that changed the length of the neck. for example; a reloader that was shooting a 300 Win Mag could form 300 Weatherby cases to 300 Win Mag without trimming the length of the case, instead they extended the length of the neck in the chamber and then throated the chamber. There was an advantage to moving the bullet out, they found they could add powder because of the added capacity. There were a few that did not wait for throat erosion, they went straight for the increased capacity.

F. Guffey

 

[ireload2]

Fake News Guffey ,,,,,
You are using circular logic.
You mention one topic and then discuss another as usual but you never have any answers of value.
These guys are talking about maintaining accuracy of a match barrel as the lands wear. They are not concerned about boosting the performance of large case hunting rifle.
Have you ever shot in competitive bench rest or other matches even once? Are you too timid to answer my comments?

There is no one on this forum that has a remedy, that is obvious but there were reloaders/smiths that changed the length of the neck. for example; a reloader that was shooting a 300 Win Mag could form 300 Weatherby cases to 300 Win Mag without trimming the length of the case, instead they extended the length of the neck in the chamber and then throated the chamber. There was an advantage to moving the bullet out, they found they could add powder because of the added capacity. There were a few that did not wait for throat erosion, they went straight for the increased capacity.

F. Guffey

 

[Raythemanroe]

Huh, I thought my imput was pretty much the standard for chasing..

Ray

 

[Mike402]

Huh, I thought my imput was pretty much the standard for chasing..

Ray

That is pretty much what I am doing. Remeasuring every couple hundred rounds, and extending bulllet out to keep same distance from lands. My real question is whether you add powder when you do this, and if so, how much?

Use Quickload to maintain same pressure? Use chronograph to maintain same velocity?

Is there a best practice of simply adding .1 grains of powder? This technique is what I'm really after.

As one poster mentioned, it makes sense that if you are in the middle of a good solid node, that you should be able to simply add small amounts of powder and be ok

 

[Raythemanroe]

That is pretty much what I am doing. Remeasuring every couple hundred rounds, and extending bulllet out to keep same distance from lands. My real question is whether you add powder when you do this, and if so, how much?

Use Quickload to maintain same pressure? Use chronograph to maintain same velocity?

Is there a best practice of simply adding .1 grains of powder? This technique is what I'm really after.

As one poster mentioned, it makes sense that if you are in the middle of a good solid node, that you should be able to simply add small amounts of powder and be ok

Don't fiddle with your powder tune unless you are gonna go back and test (ladders and chron)

Ray

 

[Richard Coody]

That is pretty much what I am doing. Remeasuring every couple hundred rounds, and extending bulllet out to keep same distance from lands. My real question is whether you add powder when you do this, and if so, how much?

Use Quickload to maintain same pressure? Use chronograph to maintain same velocity?

Is there a best practice of simply adding .1 grains of powder? This technique is what I'm really after.

As one poster mentioned, it makes sense that if you are in the middle of a good solid node, that you should be able to simply add small amounts of powder and be ok

What is your target telling you?

 

[Jet]

There is no set in stone answer for this since there are to many variable but I do subscribe to Donovan's process of increasing the powder weight a bit to keep the tune going. As Richard says above, let the target determine what is going on. If you have a solid tune and the gun starts to shoot erratic/larger groups start by addressing your seating depth. If that doesn't get it to where it should be plus the powder up a bit.

Good shooting.

Rich

 

[Mike402]

What is your target telling you?

Actually I'm right in the middle of this. First 6mm on its first barrel. I just returned from a 4 day precision rifle class where I shot 250 rounds. That has brought me to 600 total rounds fired, and I was trying to get some opinions before I start making more rounds. I'm going to start with just increasing COAL and see where that gets me in terms of group size and velocity. I wanted to minimize experimenting and preserve the barrel as much as possible.

 

[Jet]

Mike

Now might be a good time to order up a new barrel and get it to your gunsmith. Minimizing the round count on a barrel while learning the ins and outs of precision shooting will hold you back. Use this barrel to learn with and use it to practice and fire form brass with once your new barrel arrives.

Good Shooting

Rich

 

[Raythemanroe]

Best advice ever, and could be copied and pasted for a response to about every question on here. Hope you don't mind if I steal it sometime!

Tom

Good advice, except they wouldn't be asking if they knew what to do with what they see..

Ray