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Primer seating tools?

I have this one as well. Bought it for the indicator and all the "crush .xxx" hype, but took it apart and found a spring inside. The real magic of this tool is it pushes the primer in until it bottoms out and the tension or crush is determined by the force it takes to compress the spring. All primers are seated to the same preload no matter their height.
Try this to see for yourself. Set it all up and seat a primer to "0", then keep going till the indicator stops moving, which is about .004. Then keep pressing. The lever keeps moving, but the indicator doesn't. That's because you're compressing the spring
I just investigated this. The indicator does not move by 'force', but by direct displacement of the center plunger. There is a safety feature, which I have never run into, to prevent a complete crushing of primers.

For instance, If I place a case only partially into the shell holder and raise the plunger into the case head, where it is stopped by misalignment, the handle can be squeezed further. BUT, the indicator does not move with further handle squeeze at that point. It is stopped right where the plunger is stopped.

So the indication of crush IS correct, regardless of force applied.

Attached patent drawing.
K&M US5025706-1.jpg
 
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My friend @INTJ really likes this K&M primer seater and if I was in the market for another, I would give this one a try on his recommendation.
 
I have a 21st Century and PMA. They both enable me to adjust the seating depth - 21st Century one click is .001” and PMA is a no-click turn for super fine adjustments. Both have pros and cons - 21st Century is easily locked in place with clicks but adjustable to .001” whereas PMA doesn’t lock in place but can adjust to .0005. Anyway, both work very well if you want fine adjustments and plan to place a primer in the tool for priming. If you’re loading like 2000 rounds at a time for plinking, then I suggest looking at a high volume rapid priming tool.
 
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I have tried a bunch of seaters and I ended up with the 21st century one at a time. I really like it. For hunting loads the older lee primer tool works great.
 
Just bought my second RCBS and primer with the. Semi octagon feeder tray. $49 Amazon. Already primed about 1200 rds so far
 
I’ve had two seaters since 196?
C&H which I wore out about 10 years ago.
Bought an RCBS bench mounted also.
Both worked right up to my standards which is bottoming the primer with feel.
If I thought something else would make my groups smaller, I’d have it.
 
This is the set up I use mostly, hard to beat for the cost and reasonably fast. Note the Holland attachment for consistant seating depth.

RCBS Primer Seater with Holland Guns Perfect Primer Seater attachment.JPG
 
Lately I am shooting alot of pistol and I prime with my Coax press (this is getting old) it works but is so freakin slow. considering a bench mounted primer. following this post.
 
I have 2 of the Bald Eagle bench priming tools and like them. Very easy on old hands. Every once in a while you see posts of guys looking for these priming tools. Unfortunately, they quit making them a while back.
 
I have 2 of the Bald Eagle bench priming tools and like them. Very easy on old hands. Every once in a while you see posts of guys looking for these priming tools. Unfortunately, they quit making them a while back.
Yeah this is spot on with what i am looking for
 
If you don't mind priming one at a time, this works well in a rock chucker. RCBS ram prime with shims. Does a great job with consistent depth... If you can seat bullets to within .001", and set shoulder bump within .001".. why not seat primers to within .001"?.. Loaded at least 100 rounds since this video and pretty happy with it.

 
I can't not love the rcbs universal hand primer. I must say I haven’t spent time measuring....but I sink it full stroke and it's fast and easy.
 
On a somewhat related topic, IMO 21st Century could sell a lot more stuff if they would fire the high school programmer who built their website, and get something a little more 21st century.
 

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