Hornady headspace tool question

[Coonman300]

I have a 6.5 Creedmoor and it is not listed on the bushing size chart on my Hornady Comparator so I’m not sure which bushing to use. Does anyone know?

thanks!

 

[Texas10]

I use letter C, .375"

 

[Coonman300]

Thanks!!

 

[46and2]

I cheated. I drilled a bigger hole in a OAL bushing to measure headspace, I was too cheap to buy the headspace kit.
All you are measuring is a datum point at an appropriate point on the shoulder of the brass. As long as the bushing contacts the middle of the shoulder that's all that matters.

 

[whatsupdoc]

Correct bushing for 6.5 creedmoor is .400

 

[Kracken McGraw]

I use letter C, .375"

+1, I use C .375 also.

 

[T-shooter]

Correct bushing for 6.5 creedmoor is .400

A .308 also uses .400".

 

[Richard Jones]

I use the datum line diameter. In this instance, .400.

 

[Conaso]

"D" .400"

 

[RussellJ]

I have a 6.5 Creedmoor and it is not listed on the bushing size chart on my Hornady Comparator so I’m not sure which bushing to use. Does anyone know?

thanks!

I always go by the print, I hi-lited it the dimension on the print below.

 

[Lefty Trigger]

Either will work so long as YOU remember which one you used and stick with it. No two people will ever get the same measurement anyway because every rifle could be different.

 

[RussellJ]

Either will work so long as YOU remember which one you used and stick with it. No two people will ever get the same measurement anyway because every rifle could be different.

+1 what Lefty Trigger said!!!

 

[TQB]

For what it's worth, Hornady says it is C.375''.
https://www.hornady.com/headspace-bushings#!/?utm_source=QR&utm_medium=QR&utm_campaign=QR

 

[spife7980]

According to the above chamber print:shoulder base diameter is .463, shoulder top diameter is .297

.463-.297=.166 total diameter difference between shoulder location diameters.

The middle of the shoulder is half that difference (.166/2=.083) added to the small or taken from the large.
.297+.083=.380" (or .463-.083=.380) as the diameter at the middle of the shoulder.

Thats a smidge higher than the C .375 bushing and a smidge lower than the D .400 bushing. Either will work, just use the same one to compare measurements.

Or keep records of the size with both bushings for twice as much work

 

[Conaso]

FWIW - I have both fired and reloaded Lapua brass on hand from the same reloading session. The "D" .400" bushing, which I used, measured .0015" headspace differenc. I then measured using the "C" .375" bushing. The headspace difference was the same. (Which I expected.

 

[Coonman300]

Thanks guys, that’s great info!