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  #1  
Old 08-05-2021, 11:57 PM
wombat wombat is offline
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Default Comparator bushings

Hi all,
I have Hornady comparator bushing marked 17 for .172 that measures 0.164”
Made from alloy.
And I have a SInclair comparator bushing marked .17 that measures 0.170”
Made from stainless steel.
Am I reading “too much into this” !!!!?
I suppose if you consistently use the same one it will always be the same reference.
But it seems that this is a big discrepancy!!
Any others on the forum seen this or are aware of this, or any thoughts on the relevance to my reloading.
I reload for a .17/222.
Thanks for any comments or opinions, Jay
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  #2  
Old 08-06-2021, 12:17 AM
Wiserfool Wiserfool is offline
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Hornady ain't no Sinclair by quite a long shot.........
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  #3  
Old 08-06-2021, 12:30 AM
Oso Polaris Oso Polaris is offline
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Location: Houston, Texas
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I saw something about this earlier this year and bought the Sinclair steel inserts and shipped the Hornady aluminum inserts to a friend (better than nothing).

I just tried to measure my Sinclair gage .17 insert, but my calipers are inadequate to accurately measure the tapering hole at its narrowest. How did you measure it... pin gauges?
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  #4  
Old 08-06-2021, 01:43 AM
wombat wombat is offline
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Default Comparator bushings

Hello Oso,
I used the very tip of my digital calipers....multiple times to ensure I was getting consistent readings,,,,,
Sounds like maybe the SInclair maybe be of better accuracy, will look foward to hear others who may have more on my query.
Thanks, Jay
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  #5  
Old 08-06-2021, 04:15 AM
georgeld georgeld is offline
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I don't recall the one bushing die I had Jim Cartenson sp? make for me.

I bought a chamber reamer from Mark D for the .17VR that cut a

.195" neck. I found that was TOO tight and split the shoulders of

every case fired in it. I ended up sending the barrel to Paul Rogers

to figure out the problem. That's what he found and reamed it out

to .172". That cured the problem I had. Paul explained such tight necks

pinch the case and won't allow the case neck to move causing pressure to

split the shoulders.

Keep this in mind if and when you have problems.
__________________
George

"Gun Control is NOT about guns,
it's about CONTROL!!"
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  #6  
Old 08-06-2021, 10:12 AM
Kiwishooter Kiwishooter is offline
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Posts: 1,794
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Quote:
Originally Posted by wombat View Post
Hi all,
I have Hornady comparator bushing marked 17 for .172 that measures 0.164”
Made from alloy.
And I have a SInclair comparator bushing marked .17 that measures 0.170”
Made from stainless steel.
Am I reading “too much into this” !!!!?
I suppose if you consistently use the same one it will always be the same reference.
But it seems that this is a big discrepancy!!
Any others on the forum seen this or are aware of this, or any thoughts on the relevance to my reloading.
I reload for a .17/222.
Thanks for any comments or opinions, Jay

Jay, you are right the Sinclair comparator bushing holes are larger in diameter than the Hornady bushings.
I've got both sets and predominantly use the Hornady bushings.

I found I could get a reading from the Hornady bushings when the projectile is seated short, while I found the Sinclair comparator insert slipped all the way down the projectile and seated on the top of the neck and not the ogive of the projectile.

My thought would be to use the one that gives you a reading and only use that one, don't measure one with the Hornady and the other with the Sinclair and try and compare the readings...……….Kiwi
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  #7  
Old 08-06-2021, 12:23 PM
SEM SEM is offline
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Location: Sac CA
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Quote:
Originally Posted by Kiwishooter View Post
Jay, you are right the Sinclair comparator bushing holes are larger in diameter than the Hornady bushings.
I've got both sets and predominantly use the Hornady bushings.

I found I could get a reading from the Hornady bushings when the projectile is seated short, while I found the Sinclair comparator insert slipped all the way down the projectile and seated on the top of the neck and not the ogive of the projectile.

My thought would be to use the one that gives you a reading and only use that one, don't measure one with the Hornady and the other with the Sinclair and try and compare the readings...……….Kiwi

+1 -- same here
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  #8  
Old 08-06-2021, 01:05 PM
SmokinJoe SmokinJoe is offline
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Location: Augusta, GA
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Comparator bushings are definitely not interchangeable and not intended to be. The Sinclair bushings are made to contact closer to the rifling contact point; the bullet seems to almost always stick in the Sinclair comparator bushings whereas that is not the case with the Hornady bushings.
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  #9  
Old 08-06-2021, 02:30 PM
Bill K Bill K is online now
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Overall the Hornady bushings just seem to work better.
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  #10  
Old 08-06-2021, 03:41 PM
Oso Polaris Oso Polaris is offline
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Location: Houston, Texas
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Quote:
Originally Posted by SmokinJoe View Post
Comparator bushings are definitely not interchangeable and not intended to be. The Sinclair bushings are made to contact closer to the rifling contact point; the bullet seems to almost always stick in the Sinclair comparator bushings whereas that is not the case with the Hornady bushings.
I think the Sinclair have a crisp taper as reach bullet diameter, whereas, the Hornady is just a smooth rounding curve. I find that with the Sinclair insert that I if hold bullet inside the gage and then advance the caliper up to the cartridge head/base until I am no longer able to shift/wiggle the case on the caliper base. If the cartridge sticks then I know I have pushed/gone a bit deep.

Another accessory that has simplified my process is a machined base for my caliper. This is made/sold by one of the members,"delv7915", on Accurate Shooter's Forum. I think it was $20, and I can't say enough... no more balancing the cartridge.


Last edited by Oso Polaris; 08-06-2021 at 04:02 PM.
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