6 dasher

[Bill Norris]

I turn necks- my 6 mm loaded round OD is .265, I have tested several bushings at 500 yards, .262 shoots ok , .261 shoots much better while a .260 might be better yet. Time will tell.

Yes Sir, I find in a lot of cases neck tension is our friend especially at longer distances.

 

[Brawley_z06]

Yes Sir, I find in a lot of cases neck tension is our friend especially at longer distances.

how much neck tension do u aim for bill?

 

[Bill Norris]

how much neck tension do u aim for bill?

I try to get .003 interference fit between inside diameter of the case and bullet measurements. This has been the most consist setting for me with all of my rifles. So with a .243 bullet I like to see .240 inside diameter case prior to loading. Brass thickness, number of firings on the brass, inside case neck surface, etc. will play a part of course with bushing and mandrel usage.

 

[Ledd Slinger]

ive been loading for this rifle for about a year now. i run lapua 6br brass. has about 5-6 firing. i loaded some rounds last night and i noticed when i ran my mandrel thru it felt like it was doing not hardly even touching the brass. when i seat the bullet i can move the bullet in and out by hand and even pull the bullet. i am running a 266 bushing in a fl sizing die and a 21st century 242 mandrel. any help would be great, thanks in advance

Probably the brass. Ensure you are getting a good anneal.

Also, if it was a new bullet you were loading or a new lot of the same bullets, check the bullet diameters at the pressure ring to be sure it’s not the bullets

 

[shoot4fun]

yes annealed with annealez. no the necks are not turned. this a prs gun not a bench gun. it shoots well the way i have been doing it but now i just noticed some of these cases with this issue

IMO you don't need to spend for a AMP Annealer but you DO need a flame annealer that utilizes two torches to get more uniform annealing results.
The only annealing I have ever done is with a Bench Source flame annealer. I have always used two torches and (quickly seeing how poor a job the small bottles of propane did) a 20 pound tank with dual supply lines.
Another thing, if you are leaving brass in the flame too long it will defeat any good you are trying to achieve.
When you see a yellow flame flare up (on a clean case neck) you have burned off some of the ingredients of the brass recipe. Then you will have brass that is inconsistent forever more (junk).
*****DISCLAIMER*******
Not an engineer nor am I a metallurgist. Also not a wordsmith so I may not be technically correct.
Usually, the flames thrown here are hotter than I see when I'm annealing!