30BR seating

[lrgoodger]

I presume that 30BR bullets should be seated with the bullet pressure ring in the sized portion of the neck, as I believe it should for all cartridges. I've just discovered that my Redding Type S bushing die does not size the neck down far enough. Even in the lands with a .010 freebore, the bullet pressure ring is still slipping below the sized portion of the neck. I can feel it when I seat the bullets slowly. With a standard Robinett chamber with a zero freebore, it would be even worse.

After realizing this about the Redding die, I checked my custom 30BR Lee collet die. It also is not sizing enough of the neck. I'm wondering if this is why my 30s are not shooting consistently in the 1s and 2s.

 

[Mega]

Same with my Wilson In-Line Neck Die, I went smaller with the bushing to increase neck tension.

 

[lrgoodger]

I see I've been misunderstood. By not sizing down far enough, I don't mean neck tension. I'm talking about how far down the neck toward the shoulder the neck gets sized. My dies are sizing only about the top half of the neck. I'm thinking about milling off a bit of the LCD so that it sizes about another .060" of the neck. That should keep the pressure ring in the sized area.

 

[Jason Boersma]

When I had a 30br Robbinette reamer seated the bullet .020 in the lands the bullet was only in the case about 1/8th inch with 34gr H4198

 

[lrgoodger]

When I had a 30br Robbinette reamer seated the bullet .020 in the lands the bullet was only in the case about 1/8th inch with 34gr H4198

That is about how much bullet I have in the case as well. The problem is, both my dies are sizing less than half the neck and it's not quite enough to keep the pressure ring in the sized area. I wonder how many 30BR shooters have even looked at this issue.

 

[butchlambert]

That is one of the reasons that I had my carbide bushings made with a very very small radius on the ID. What size bushings do you use? I had some 30 cal listed in the classifieds.

 

[Jason Boersma]

You could contact redding and see what they say about it not sizing properly.

 

[lrgoodger]

That is one of the reasons that I had my carbide bushings made with a very very small radius on the ID. What size bushings do you use? I had some 30 cal listed in the classifieds.

I'm using a Redding titanium bushing. You got me thinking and I just looked the Redding die over good and figured out that it can't size more of the neck because I have the lock ring set to bump the shoulder back .002". To get the neck up into the bushing any further I would have to bump the shoulder back much more than that, which I don't want to do. I've been using the die without the bushing to size the case and then the LCD to size the neck. That works well without inducing any runout.

 

[lrgoodger]

I figured out the Redding problem. When I came up with the idea of using it for a body die and using the Lee on the neck, I took the decapping stem off. The decapping stem is an integral part of the bushing adjustment. When I put it back in, I regained complete adjustment control on how much neck the bushing sizes.

Now to see if it helps on the target to get that pressure ring properly seated!

 

[Steve Ladino]

Before I had a Reading bushing die I used a Wilson 6 Br neck die cut .050 deeper then put a .050 washer on top of the bushing.

 

[RGRobinett]

This seems an ODD situation - using carbide (Butch's), or, Redding bushings, all of my various (Type "S") Fl/Nk bushing dies, with only a slight shoulder bump, will size all of the neck: I think you should contact Redding and see what's up - perhaps the bushing bore isn't deep enough, or possibly too narrow??? Just thinking, "out loud" . . .
I usually adjust the Redding dies to bump between 0.001" and 0.002", while sizing all but about the last 1/16th inch of the neck. I have not encountered your situation - please keep us posted regarding a cure. RG

 

[dkhunt14]

I believe you can use it without the decapping stem if you put two bushings in. I put one bigger then the size I want in first to hold the other bushing down so it can be adjusted to size down near the shoulder junction. Once you take the decapper out you don't have that knurled nut that spaces the bushing down farther. Matt

 

[Link]

OP what twist and bullet ?

Link

 

[lrgoodger]

Well the problem I was having was solved as I stated in my last post to this thread, but I have a 17 twist and shoot BIB or Cheek 118s for what it's worth.

In the multiple thousands of posts I have read on this site and elsewhere, I have NEVER seen anyone else say that flat based bullets don't have a pressure ring. My calipers say otherwise on the BIBs and Cheeks. Both measure .3085 right at the base and .308 a few thousandths above the base.

 

[RGRobinett]

"Well the problem I was having was solved as I stated in my last post to this thread, but I have a 17 twist and shoot BIB or Cheek 118s for what it's worth.

In the multiple thousands of posts I have read on this site and elsewhere, I have NEVER seen anyone else say that flat based bullets don't have a pressure ring. My calipers say otherwise on the BIBs and Cheeks. Both measure .3085 right at the base and .308 a few thousandths above the base"
Roger, thanks for the follow-up - I missed your explanation! RG