I have a dumb question

[Sniper338]

Comparator tool...

Example we use it to measure OAL off the oj with a bullet seated.

When measuring case shoulder bump, do yall use a bigger caliber comperator, say a 30 cal to measure the shoulder on a cartridge with a 6mm neck? So it goes over the neck?

Or what tool is used best for measuring shoulder bump

 

[nso123]

There is a specific tool that is used for measuring the shoulder. It fits in the comparator base.
https://www.hornady.com/reloading/p...gauges/headspace-comparator-anvil-base-kit#!/

 

[ED3]

Comparator tool...

Example we use it to measure OAL off the oj with a bullet seated.

When measuring case shoulder bump, do yall use a bigger caliber comperator, say a 30 cal to measure the shoulder on a cartridge with a 6mm neck? So it goes over the neck?

Or what tool is used best for measuring shoulder bump

https://www.sinclairintl.com/reload...ools/sinclair-bump-gage-insert-prod35265.aspx

 

[Sniper338]

Wow... been doing it wrong for

https://www.sinclairintl.com/reload...ools/sinclair-bump-gage-insert-prod35265.aspx

Thanks. I dont own a hornady anything and didnt wanna start. Wow.. ive been doing it wrong for YEARS!

Do these fit the redding comperator holders for calipers?

 

[chromatica]

OP, the base-to-shoulder measurement you are talking about is called headspace. I like the RCBS case gauge for this:

https://www.midwayusa.com/product/1012939524/rcbs-precision-mic

 

[Sniper338]

Always something to learn, even when its a basic thing lol

 

[alf]

What tool is used best for measuring shoulder bump

 

[ED3]

Wow... been doing it wrong for


Thanks. I dont own a hornady anything and didnt wanna start. Wow.. ive been doing it wrong for YEARS!

Do these fit the redding comperator holders for calipers?

Can't speak to the Redding. Mine are Sinclair.
It has a 0.25" insert depth, drops into a 0.50" bore.
The critical dimensions:

 

[JMayo]

There is a specific tool that is used for measuring the shoulder. It fits in the comparator base.
https://www.hornady.com/reloading/p...gauges/headspace-comparator-anvil-base-kit#!/

This and a #23 for ogive to base.

 

[Sniper338]

Can't speak to the Redding. Mine are Sinclair.
It has a 0.25" insert depth, drops into a 0.50" bore.
The critical dimensions:

Fabulous, Ill have to measure.

 

[hrlincoln]

Do these fit the redding comperator holders for calipers?

Not familiar with Redding comparator holders for calipers, and I didn't see anything on their website...got a Redding part#? One of my Hornadys keeps coming loose.

 

[P1ZombieKiller]

Or what tool is used best for measuring shoulder bump

Some people call this a gizmo (or gizzy)

 

[Sniper338]

Not familiar with Redding comparator holders for calipers, and I didn't see anything on their website...got a Redding part#? One of my Hornadys keeps coming loose.

Hell it could be sinclair I have. They are green holders.

 

[alf]

This appears to be a neck bushing from a larger caliber " I'm sure it works just fine

Wrong......it's a barrel stub with the finish reamer run partially in......

 

[dkhunt14]

Hell it could be sinclair I have. They are green holders.

The green ones I saw were Sinclair. Matt

 

[Dusty Stevens]

That's awesome "
Bet it works great.
Is that refered to as a Gizzy?

Functions the same but more steady. The gizzy is brass, only passes the case mouth a few thou and the dia is about the same as the case itself. Very easy to lose

 

[Falfan2017]

Comparator tool...

Example we use it to measure OAL off the oj with a bullet seated.

When measuring case shoulder bump, do yall use a bigger caliber comperator, say a 30 cal to measure the shoulder on a cartridge with a 6mm neck? So it goes over the neck?

Or what tool is used best for measuring shoulder bump

Piece of 9mm brass or 40 sw upside down works pretty well on the cheap. Also if you buy a die from harrels they send you a nice bump measure tool as well.

 

[divingin]

From the link in Chromatica's post (the link to the Sinclair comparator inserts):

"Rather than measuring to the datum line, these gages indicate off of the shoulder of the case to get a better, more easily assessable measurement of how much you are actually sizing your cases."

Can someone translate exactly what they're saying? I's assuming it's given that: 1) the shoulder datum line is an arbitrary point, generally selected as halfway down the shoulder, 2) As far as I can tell, the Sinclair inserts are identical to the Hornady inserts (though I have no idea on the hole size -what Guffey would call a "datum"), and 3) that statement seems to say that rather than measure this way, we measure this way [which is identical], but our way is better.

Am I missing something?

 

[Sniper338]

From the link in Chromatica's post (the link to the Sinclair comparator inserts):

"Rather than measuring to the datum line, these gages indicate off of the shoulder of the case to get a better, more easily assessable measurement of how much you are actually sizing your cases."

Can someone translate exactly what they're saying? I's assuming it's given that: 1) the shoulder datum line is an arbitrary point, generally selected as halfway down the shoulder, 2) As far as I can tell, the Sinclair inserts are identical to the Hornady inserts (though I have no idea on the hole size -what Guffey would call a "datum"), and 3) that statement seems to say that rather than measure this way, we measure this way [which is identical], but our way is better.

Am I missing something?

Lol no... theres guages that indicate of a datum point on the shoulder then some that cover the whole shoulder and are cut to the shoulder degree angle. This aint nothing crazy hard

 

[divingin]

Lol no... theres guages that indicate of a datum point on the shoulder then some that cover the whole shoulder and are cut to the shoulder degree angle. This aint nothing crazy hard

Ah. Gotcha. Thanks, Sniper.