Primer seating depth

[retired]

it is simply that wrong.
bottom of the pocket and then some.

The primer needs to be flush with the case head. Not sticking out, not recessed. It's that simple.

 

[ClassCat]

This is for when you really want to micro manage

 

[Dusty Stevens]

This is for when you really want to micro manageView attachment 1044751

I got one just like that

 

[ClassCat]

I got one just like that

That tool is about as old as we are Dusty.Lol. They don't make them like that any more

 

[Dusty Stevens]

That tool is about as old as we are Dusty.Lol. They don't make them like that any more

Its sure impressive lookin sitting on my loading table at matches

http://kmshooting.com/primer-gauge.html

 

[L W P]

So if you measure the depth of a Lapua SR 6.5 Creedmoor primer pocket (.1285"-.130"). And the height of a CCI-450 primer(.1185"-.119'). Doing the math wouldn't the correct depth bellow flush be around .010"-.011" ? So as for the anvils to touch the bottom of the primer pocket. And that's not with squared pockets. And I too use the K&M primer tool. It works very nice.

 

[L W P]

This is your specifications

View attachment 1044737

My numbers are not coming up correctly on this chart using Lapua SR 6.5 Creedmoor brass and CCI-450 primers.

 

[ireload2]

This McDonnell Douglas specification documents seating of both Remington and Winchester primers.
The instructions call for you to seat the primers until they are reconsolidated by pressing the anvil into the priming compound from .002" to .006"

Seating the primer flush to the case head is NOT correct.

http://www.dtic.mil/get-tr-doc/pdf?AD=ADA092511

 

[Dusty Stevens]

This McDonnell Douglas specification documents seating of both Remington and Winchester primers.
The instructions call for you to seat the primers until they are reconsolidated by pressing the anvil into the priming compound from .002" to .006"

Seating the primer flush to the case head is NOT correct.

http://www.dtic.mil/get-tr-doc/pdf?AD=ADA092511

The old school method has always been .010 crush on the anvil so thats pretty close to what most shooters believe gives the most consistency. If you use a good enough priming tool you can feel the anvils touch. Its one of the reasons for using a $100 tool over a $35 tray fed pot metal version. If you get one of the k&m priming tools with the dial on it you can feel it and measure it so youll get the feel for it. The 21st century tool that has the depth adjustment will do the same thing faster with better feel. Only difference is itll take longer to dial in your crush but theyll all be exactly the same (which is a big part of trying to get everything consistent)

 

[L W P]

correctley

So if you measure the depth of a Lapua SR 6.5 Creedmoor primer pocket (.1285"-.130"). And the height of a CCI-450 primer(.1185"-.119'). Doing the math wouldn't the correct depth bellow flush be around .010"-.011" ? So as for the anvils to touch the bottom of the primer pocket. And that's not with squared pockets. And I too use the K&M primer tool. It works very nice.

Just wondering if anyone else has come up with these numbers?

 

[Dusty Stevens]

correctley


Just wondering if anyone else has come up with these numbers?

.010 isnt too far of a stretch for a firing pin

 

[L W P]

.010 isnt too far of a stretch for a firing pin

Ok, thank you sir. Was just wondering if my math was correct?

 

[Dusty Stevens]

Could be- all primer lots and brass lots are different. If thats what the k&m tool told you just go with it. Feel those anvils touch and see if your math is right. .010 past flush seems about average but ive never actually measured it.

 

[retired]

you mean .002..not 10 ? crush..not below flush

The old school method has always been .010 crush on the anvil so thats pretty close to what most shooters believe gives the most consistency. If you use a good enough priming tool you can feel the anvils touch. Its one of the reasons for using a $100 tool over a $35 tray fed pot metal version. If you get one of the k&m priming tools with the dial on it you can feel it and measure it so youll get the feel for it. The 21st century tool that has the depth adjustment will do the same thing faster with better feel. Only difference is itll take longer to dial in your crush but theyll all be exactly the same (which is a big part of trying to get everything consistent)

 

[ireload2]

My method is 50 years old so I consider it old school.
I use the first Lee pot metal priming tool with the screw in shell holders. If you machine a little metal off of the threaded face you can adjust the mechanical advantage of the tool by controlling the height of the shell holder.
Since the primers vary in height and the primers and primer pockets vary in diameter I prefer feel for seating primers.
I have 4 or 5 other primer seaters and I have sold others that I did not consider very accurate. That includes a K&M that was disappointing.

The old school method has always been .010 crush on the anvil so thats pretty close to what most shooters believe gives the most consistency. If you use a good enough priming tool you can feel the anvils touch. Its one of the reasons for using a $100 tool over a $35 tray fed pot metal version. If you get one of the k&m priming tools with the dial on it you can feel it and measure it so youll get the feel for it. The 21st century tool that has the depth adjustment will do the same thing faster with better feel. Only difference is itll take longer to dial in your crush but theyll all be exactly the same (which is a big part of trying to get everything consistent)

 

[jepp2]

.010 isnt too far of a stretch for a firing pin

Most of the protrusion numbers I have seen are around 0.060" +/- a little.

 

[Richard Coody]

i prime by feel. firmly seated in the pocket. if you want primer failures then use some arbitrary primer seating measurement.

 

[L W P]

I now have a tool that offers adjustable depth primer seating. the new Frankford Arsenal tool is pretty slick for $60.


my questions are, how far deep do I seat them? what form of testing will confirm the "correct" amount? will it show up in ES and SD data on the LabRadar? Does it really matter as long as they go bang every time?

inquiring minds want to know

OP ?. To the guys that say that they seat by feel. No one really has given any measurement to below case head. I get it that you guys go by feel but you could give some idea in measurement where that is. Just asking if you have ever measured the depth of your primer, in reference to after seating by feel? And from the case head. Maybe you never have measured after you seat by feel, I'm not sure.

 

[retired]

READ what i said
BOTTOM OF THE PRIMER POCKET, AND A SMALL CRUSH IN PLACE.
primers and prime pockets have specs..there is no ONE number.

OP ?. To the guys that say that they seat by feel. No one really has given any measurement to below case head. I get it that you guys go by feel but you could give some idea in measurement where that is. Just asking if you have ever measured the depth of your primer, in reference to after seating by feel? And from the case head. Maybe you never have measured after you seat by feel, I'm not sure.

 

[L W P]

READ what i said
BOTTOM OF THE PRIMER POCKET, AND A SMALL CRUSH IN PLACE.
primers and prime pockets have specs..there is no ONE number.

So you never measured?