22 BR Dummy Round Results

[MDHOGGER]

This is the results of loading up my dummy round with a Forester 22BR FL die. As I hope you can see the die would not size the entire neck. I turn the die down as tight as I could to get the maximum result. The total neck length is approximately .315" and an amount of .290" was sized. The headspace remained the same as did the case length at 1.554" long. I know I can neck turn this step off to just into the shoulder but do I need to do this to fire a round or would this create a problem. I have bought the 22BR form and trim die too but neglected to get the extended shell holder. I don't know if the form die would do a better job on the neck. I also have the Redding type S die to do maintenance sizing. The loaded round neck diameter above the step was .2503" FYI the parent 6mm Lapua brass neck thickness was .0123" after forming down to 22BR it is essentially .013" thick. I am now at the point of wanting to get a custom reamer and order a barrel blank for this build. Thanks for any input. Bill

 

[TheBlueEyedBear]

Will the case chamber in your rifle as shown? If so, no problem. Just shoot and blow the brass out. I do that with my brass that I neck down. I size it just to the point where it will chamber in the gun and then load and shoot. If you want to get rid of the ring around the brass look, just use your trim die and adjust it down until you have a fully sized neck.

 

[MDHOGGER]

If you read in my post I am at the beginning of this build. I made up the dummy round to figure out the dimension for my reamers chamber neck. Also another thought I had was this might be my die pushing the brass down into the shoulder as opposed to the die not sizing the total neck length.

 

[MGYSGT]

You can get the die to size that little ring, by grinding down your shell holder that amount. That will put the ctg into the die that little bit farther, instead of stopping at that spot.

 

[Phil]

The seating stem mark is VERY prominent on that bullet......

How much neck tension do you have?????

 

[MDHOGGER]

I am not sure I could grind that much off the shell holder. If you read the difference above it is about .025". I decided to set up my neck turner if necessary in the future and got rid of the step. If and when I send out the dummy round to PTG I want it to be in a good condition. I did five to have on hand for testing.

 

[MDHOGGER]

Yeah I noticed the mark on the bullet from the seating stem. With the initial seating of the bullet there was no mark. I did seat this bullet about seven times while I was working it in to a required seating depth. I thank you for the heads-up and will watch to see if this continues with a normal one time bullet seat.

 

[Phil]

I could see it being marked up if you used the same bullet for seating that many times.....

 

[lynn]

Take something very flat and smooth like a piece of glass and tape some 80 grit sandpaper to it.Mix a few drops of dish soap into a small amount of water and use this as a lubricant.Take your die and holding it level on the sandpaper work it in a figure 8 pattern to remove some of the dies base.
Lynn

 

[MDHOGGER]

Thanks for the suggestions but I am still wondering if this donut/step is inherent in sizing down the neck. I was thinking of doing a no-turn neck but if I have to turn off this step I might as well do a light clean up anyway to uniform the case neck. If others are not getting this step please let me know your sizing procedure and dies used. Like I said when I get my extended shell holder I will try sizing a case with the form and trim die I bought and see if the results are better. Here is the paragraph from the article on forming the 22BR below regarding this issue.

Using a full-length sizing die is the better method, as the bushings tend to push brass down to the neck-shoulder junction (NSJ). With either method we suggest you run a mandrel down the necks after necking down, and neck-turn the last .050" or so of the neck and slightly up into the shoulder. This will remove any bulge at the NSJ, and help prevent doughnut formation. And remember to load a few dummy cases before you spec the neck diameter for your reamer to ensure your cases will chamber without further neck-turning.