Question on neck prep

[madmixerman]

Do you guys chamfer the inside & outside of necks before each reloading or only after trimming ?

 

[Dgd6mm]

I do mine only after trimming.

 

[nosualc]

Once on new brass, and then again every time you trim it.

-nosualc

 

[amlevin]

I do it all in one step. I use a 3-Way cutter on my RCBS lathe type trimmer and trim after each firing. Maybe not all that necessary but I have a nice "square with the case axis" case mouth every time. The de-burr and chamfer just happen at the same time

 

[BoydAllen]

The treatment when new depends on its condition. Some brass needs trimming to square it up and if that is the case, I chamfer and deburr. If it looks good to go for squareness and thickness at the mouth (Some American Brass is made thicker there by tumbling to polish.) I just chamfer. After that I do both after each trim. I take very little off when deburring.

 

[madmixerman]

Thanks guys, I chamfer & debur after trimming. I thought I may be missing something but I guess I was doing it right.

 

[CatShooter]

Do you guys chamfer the inside & outside of necks before each reloading or only after trimming ?

I just trim, I don't chamfer inside or out.

 

[Erik Cortina]

Do you guys chamfer the inside & outside of necks before each reloading or only after trimming ?

I just trim, I don't chamfer inside or out.

I do it every time I shoot the brass. I have a Giraud trimmer so I trim and chamfer all at the same time.

 

[bigedp51]

Do you guys chamfer the inside & outside of necks before each reloading or only after trimming ?

I just trim, I don't chamfer inside or out.

CatShooter

Why don't you tell them what you do to the case mouth to aid seating instead of being cryptic.

 

[CatShooter]

Do you guys chamfer the inside & outside of necks before each reloading or only after trimming ?

I just trim, I don't chamfer inside or out.

CatShooter

Why don't you tell them what you do to the case mouth to aid seating instead of being cryptic.

I use a mysterious die made by the (Shhhush) "L" company, called the "M" die, so my case mouths don't rip up my bullet jackets.

It workie velly good!!

 

[bigedp51]

I sent a PM to CatShooter about "HOW" he uses the Lyman type M die after one of his cryptic replies here. , And I asked him questions on his procedures and how he uses the "step" to flare the case mouth.

I read about this in other forums where the step is made deeper to aid bullet seating and reduce neck runout. CatShooter just bumps the case mouth at the step and gives the case mouth a very slight flare, rather than chamfering. I believe CatShooter is neck sizing only and a bushing neck die is used followed by the type M die for just the flare. But as usual cryptic CatShooter does not tell the full story.

I'm experimenting using the expander in my full length dies followed by the type M die and without the expander in the FL die and just using the Lyman type M die for expanding and see which produces the least runout.

 

[BoydAllen]

Here is one little thing that I discovered about my .30 cal M die, back in the days when I was shooting cast bullets. First of all, the expander screws into a threaded plug that is larger in diameter and the assembly is screwed into the top of the die body. (Yes, I know that you know this. That part was for those who don't have one.) Anyway, as some point I put the expanding assembly in a V block so that it was riding on the full length of the plug's threads, and as I turned it, I could see the end of the actual expander making a small circle which made it obvious that the expander was cocked relative to the CL of the plug. The way that I fixed it was to alter the bottom face of the plug so that as the shoulder of the expander tightened against it that it it ran true. M dies are unique in their design, and I believe quite worthwhile in more than one application. For instance, they tend to square up short FB pistol bullets before they are seated in their cases. Particularly in cases where neck tension was not to be used as a tuning variable, and high bullet pull not needed (most situations) , I think that there is a lot to recommend their use.