CoAx press priming system

[Bora72]

Hello, have some adjustements on the primer post for correct seathing ?

Thanks

 

[PatMiles]

Define "correct seating".

 

[RegionRat]

If I understand your question correctly, no.

A typical press can be used for seating primers, but off the top of my head I can't recall a press that has an adjustable depth stop for priming (that works well).



There are aftermarket priming adapters which use the press that have do have adjustments. This one comes to mind.
https://www.derraco.com/product/pcp...system-by-derraco-engineering-pre-order-link/

Or try something like this for a while and intentionally play with the depth. A tool like this one is slow, but gives you complete control because it locks down the rim before you seat. This method is always referenced to the base of the case.

https://www.brownells.com/reloading/reloading-tools/priming-tools/sinclair-priming-tool/

 

[Straightshooter1]

Hello, have some adjustements on the primer post for correct seathing ?

Thanks

I assume you're talking about the priming post assembly on the Forster Co-Ax's press and it's ability to be adjusting for seating depth???

If so, yes. . . in the far past I've used it a lot where I'd adjust seating depth by screwing it in or out to get the seating depth I was after. Sometimes that wasn't enough and I resorted to using various thickness shims on the hard stop to affect the seating depths.

 

[Bora72]

Define "correct seating".

Yes, sorry, "correct seating" as described in the Co-Ax manual.
From what I understand, you just screw the small or large adapter onto the press without adjusting the primer seating depth.
But I'd like to confirm whether screwing or unscrewing the tool onto the press adjusts the primer seating depth.

Thanks

 

[Bora72]

If I understand your question correctly, no.

A typical press can be used for seating primers, but off the top of my head I can't recall a press that has an adjustable depth stop for priming.

There are aftermarket priming adapters which use the press that have do have adjustments. This one comes to mind.
https://www.derraco.com/product/pcp...system-by-derraco-engineering-pre-order-link/
View attachment 1750009

This on the Co-Ax..

 

[RCE1]

I'd say the CoAx has many fine qualities. Seating primers isn't really one of them, in my opinion. There are better alternatives. I've been using the Derraco, as illustrated above and like it quite a bit.

 

[Bora72]

I assume you're talking about the priming post assembly on the Forster Co-Ax's press and it's ability to be adjusting for seating depth???

If so, yes. . . in the far past I've used it a lot where I'd adjust seating depth by screwing it in or out to get the seating depth I was after. Sometimes that wasn't enough and I resorted to using various thickness shims on the hard stop to affect the seating depths.

Yes, the one from the Co-Ax press.
The manual doesn't mention the possibility of adjustment.
Was your need to adjust the inserter due to the fact that you had cases with non-standard or aftermarket machined primer seats?

Thanks

 

[Bora72]

I'd say the CoAx has many fine qualities. Seating primers isn't really one of them, in my opinion. There are better alternatives. I've been using the Derraco, as illustrated above and like it quite a bit.

Derraco is definitely better than the Forster system, but for now I would like to use this as an alternative to the Lee XR.

Thanks

 

[Straightshooter1]

Yes, the one from the Co-Ax press.
The manual doesn't mention the possibility of adjustment.
Was your need to adjust the inserter due to the fact that you had cases with non-standard or aftermarket machined primer seats?

Thanks

Different brass often has different primer pocket depths. And. . . different brands of primers have different heights. Since I am particular about getting about .003 to .004" of "crush" I take measurements of both primer pocket depths and over all primer heights, then make adjustments to my primer seating tool to get this "crush" I'm after. I also uniform primer pockets since there tends to be difference in pocket depth within any particular lot of brass. Those who seat by feel, tend to not have any of that concern.

When when using my Co-Ax press to seat primers, any time I primed a different brand or size of case, I'd have to make an adjustment to that seating assembly. Before I figured out how to make adjustments, seating by feel didn't work for me with the Co-Ax as sometimes it I felt it was crushing some primers too much.

My next tool after using the Co-Ax was the 21st Century adjustable hand priming tool. It does a great job in producing consistent seating and is very easy on the hands due to the nice leverage it's designed with.

 

[Bora72]

Ok I understand.

I use only Lapua brass and also I uniform the primers pokets.

Thanks

 

[RegionRat]

This on the Co-Ax..

If you fuss with that enough, you can make it work.

On the other hand, if you really care about seating primers and controlling the process you will want to try one of the alternatives.

By the dimensions, seating primers isn't what I consider difficult. At the same time, you would be surprised at how often problems are traced back to seating results that were not within the specification window.

 

[AICS308]

I can’t be sure but the picture seems to show the case holder on the left side is not installed correctly. Again I’m not sure by the photo but you might want to check it if you are having issues.

 

[Bora72]

If you fuss with that enough, you can make it work.

On the other hand, if you really care about seating primers and controlling the process you will want to try one of the alternatives.

By the dimensions, seating primers isn't what I consider difficult. At the same time, you would be surprised at how often problems are traced back to seating results that were not within the specification window.

Hello can you explain?

 

[Bora72]

I can’t be sure but the picture seems to show the case holder on the left side is not installed correctly. Again I’m not sure by the photo but you might want to check it if you are having issues.

Hello, yes you are rigth, for my case the circle stamped on the jaws come on the case direction.

Thanks!

 

[jelenko]

There's a thread over on Rokslide where someone used teflon tape to secure the primer ram higher up - hence increasing the seating depth.
Someone else mentioned using shim washers.

 

[Bora72]

I've had this press for a few days and haven't used its priming system yet.
I was just wondering if you need to adjust the seating depth before using it, or if the system just works as is.
As for the accuracy, I can't really quantify that. I use a simple Lee XR and frankly, I don't feel the need for it.
Maybe I'll buy the 21st Century or Frankford Arsenal tool later; we'll see.

 

[neckturner]

I was just wondering if you need to adjust the seating depth before using it, or if the system just works as is.

There is nothing to adjust, so you don't need to. It seats primers .003" below flush, or at least mine does. If I crank on it, .0035". It isn't the fastest thing, but it works and come with the press.

Setting up the sliding case holders carefully is the key to success.

 

[jelenko]

There is nothing to adjust, so you don't need to. It seats primers .003" below flush, or at least mine does. If I crank on it, .0035". It isn't the fastest thing, but it works and come with the press.

Setting up the sliding case holders carefully is the key to success.

Same here.
There is a LOT of leverage available when seating primers.

 

[FTR_Mojo]

I used the co-ax for years to prime. I actually really liked it and it was reasonably consistent.
From hazy memory, I think its set for 5 thou crush ( for 308 lapua palma brass ).
As others have said, setting the jaws perfectly is very important.