Lou Murdica's process

[Bill Norris]

I'm not a top shooter in any sense of the word, but I had to use 5 different FL dies to find the one's that worked for both of my 6PPC's. Both rifles actually have the same headspace, but the brass from 1 rifle won't even allow the bolt to start closing on the other. The difference is one is .001 bigger at the base than the other rifle. Headspace and shoulder diameter are exactly the same.

Just because the bump is set doesn't mean it's sized correctly. Headspace is only 1 of 3 dimensions that need properly sized. The dies that worked are the JLC die and a Harrell's "0" for anyone that is wondering.

Sizing @ the 200 line is just as important as any measurement when it comes to easy chambering the round.

 

[Mistyrkool]

Murdica Quote. "If you’re not using an AMP annealer, you’re better off not to anneal."

Opinions on that quote ??!!??

I defer to Lou's expertise but many have annealed and benefitted. Ask Erik Cortina. I use a Fluxeion induction annealer with water cooled coil. I am meticulous in brass preparation and pay attention to force required to seat bullets. I also use Neolube 2 in the necks...

 

[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