Lou Murdica's process

[D Coots]

I came across this article

Top Benchrest Shooter Lou Murdica Talks With LoadDevelopment.com - LoadDevelopment.com

To get to the real world truth about precision rifle reloading, we talk with pro shooter Lou Murdica.

www.loaddevelopment.com

I find it very informative. What does he mean "Don’t over size your brass."?
What do you think about his load development process:

1. I work up my load using a powder that fills the case.
2. I start with bullet making almost a square mark from the lands of the barrel
3. Then I load the powder on the light side and shoot 2 shot groups working up in powder 1/2 grain at a time until I start to see pressure signs.
4. Then I look at the 2 shoot groups and shoot 3 shot groups of the loads that look good.
5. Then I shoot 5 shot groups again from those that look good.
6. I take the best group and then back off the lands .003 at a time and see if it can improve groups."

I don't quite understand why he is doing no. 4&5 with a bullet in the lands. Isn't that too risky? Why doesn't he start at at least t thau off?
I cannot seat bullets to exactly the same length I always have 1-2 thau variation. If I seat the bullets 0-5 thau off the lands does this 2 thau variation in CBTO has bigger impact on velocity (pressure differences) than if I seated my bullets 10-20 thau off the lands?
I am looking at 100m-300m accuracy.

Mr Marchx

I didn't read all posts but if you can't seat bullets at less than a thou consistently you will be chasing your tail. 1-.002 variation doesn't cut it.

 

[marchx]

@D Coots thank you for your helpful remark. It's been 3 years since I wrote that post and according to my caliper I made some progress wih regard to issue you are referring to.

 

[JEFFPPC]

did anyone else notice how flat the seating pressure graph was?

Lol