Run out

[209jones]

One of the very knowledgeable guys on this board has told me about
a possible way to reduce runout when using a Redding Competition Seater.

It turns out that the case shoulder does not touch the shoulder of the sliding
sleeve---not having the tapered case shoulder nudged toward the center.

The suggested improvement was to face off the bottom of the sliding
sleeve by a TBD amount---a questionable thing for a person with my skills.

A workaround was to remove the shell holder and put a small ceramic disk
magnet on the top of the ram.

This did allow contact between the two shoulders and make a minor reduction
in bullet runout----not tested to see any improvement on the target.

This is a small job for a skilled machinist---but---any merit here ?

A. Weldy

To my mind that just creates a floating shellholder equivalent, same effect as a Co-Ax or MEC. Don't know til you try it, could just cut off the U part of a shellholder.

 

[Lucky Shooter]

I was not aware of a floating shell holder. This was easy to do
and I'll make a target comparison when I can get back into
shooting.

I'm not going to do any cutting on the Redding sleeve
unless I see improvement on the target.

A. Weldy

 

[ELR LVR]

My shellholder in my Rockchucker wiggles around a little bit
You guys need to not tighten down your shellholders to your ram

 

[charlie b]

Gosh Sherm! I realize I'm the new guy here and I really don't want to be picking a fight right away. Does everybody got to do things just like Sherm does? And if we don't we are all wrong? You are coming across as being really difficult.

I don't see what Sherm said as being difficult. He did emphasize not to trust the AI, which I agree with.

He is simply stating that the end result is the important thing. Not everyone will agree with your method. There are some really, really good shooters in this forum. I have seen some of them argue about all aspects of rifle building, reloading and tuning a load (among many other things). Some insist on mandrels, some do not. Some body and neck size in one go, some do not. Every now and then one will use a custom cut FL die with no bushings or mandrels. Some insist on neck turning, some ream the necks, some do neither.

One of the great things about this hobby is the multitude of variables and the methods used to reduce them.

 

[BoydAllen]

One of the very knowledgeable guys on this board has told me about
a possible way to reduce runout when using a Redding Competition Seater.

It turns out that the case shoulder does not touch the shoulder of the sliding
sleeve---not having the tapered case shoulder nudged toward the center.

The suggested improvement was to face off the bottom of the sliding
sleeve by a TBD amount---a questionable thing for a person with my skills.

A workaround was to remove the shell holder and put a small ceramic disk
magnet on the top of the ram.

This did allow contact between the two shoulders and make a minor reduction
in bullet runout----not tested to see any improvement on the target.

This is a small job for a skilled machinist---but---any merit here ?

A. Weldy

When you are making the kind of clearance that you described, between the top of the shell holder and the bottom of the seater sleeve, precision is not required as long as they do not make contact during operation, You could do it with a grinder or file. and debur by hand with abrasive paper. Another thing that can be done is to put a layer of tape inside of the bottom of the sleeve to reduce the clearance to the case. This can be a bit tricky but it can be done, with scissors and an exacto knife.