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Measuring Base to Ogive Length w/ Hornady OAL Gauge

 
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  #1  
Old 05-29-2013, 09:14 PM
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Measuring Base to Ogive Length w/ Hornady OAL Gauge

I picked up a Hornady L&L OAL gauge, and am using it to measure the Base to Ogive length (actually COAL with the bullet loaded to the lands) in my 6mm Rem.

I am getting wildly different lengths when I try to load the modified case short, and then tap the bullet out longer (which seems to be what the instructions recommend), but consistent lengths when I load the bullet long, and then use the rifling to stop movement of the bullet while moving the case forward. The lengths measure using the second method are also almost .15" longer.

Does anybody have any advice or just thoughts?
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Old 05-29-2013, 10:20 PM
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

I run a cleaning rod down the muzzle, and use counter-pressure to gently "sandwich" the bullet back and forth into the rifling. I've done some blind tests and my results are pretty consistent.

Good luck!
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Old 05-30-2013, 03:57 PM
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

Don't forget to measure the modified case headspace length and note the difference between that and your resized cases.
Why not let your groups tell you what is the best seating depth? Touching the lands is just a starting point anyways. Go up and down in depth and see what shoots the best for your gun.
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Old 05-30-2013, 06:59 PM
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

The Hornady/Stoneypoint method is just poor in every regard.
To begin, it assumes chamber dimensions and that a case used in measure would fit correctly(w/respect to what?).
With this, many get poor/inconsistent measurements.

I personally use an RP Tool, which is a cleaning rod with an end flat, and no case is used. It's just reference bullet tip with ogive against lands -to boltface. This is followed by seating THAT bullet in any case to reach that COAL, and then measuring with a comparator to get touching OgvOAL. It's just a point of reference.

As el si implied, fear not about it.
It's useful only in logging reference. That is, 'best results were found at':
- 8thou off touching
or
- 2.693 OgvOAL
Either provides the same function.
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Old 06-01-2013, 03:46 PM
Zep Zep is offline
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

Mikecr - I agree with your comments on the Stoney Point, I use a wood dowel against bullet tip and move back and as VarmintH8R states. Yes it is a reference but it takes a heck of a lot of practice to get something to work with. Can you give us some more info on the RP Tool?
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Old 06-01-2013, 07:39 PM
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

Thanks Woods right here for the info
Hornady OAL Guage ?
Head Spacing tools - The Optics Talk Forums

C.O.L. E-Z Check from
R-P Products
PO Box 7692
8010 Dixie Blanchard Rd
Shreveport, LA 71107
Phone # 318-424-7867
r_reeves61@bellsouth.net
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Old 06-01-2013, 10:37 PM
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Re: Measuring Base to Ogive Length w/ Hornady OAL Gauge

Quote:
Originally Posted by Mikecr View Post
Thanks Woods right here for the info
Hornady OAL Guage ?
Head Spacing tools - The Optics Talk Forums

C.O.L. E-Z Check from
R-P Products
PO Box 7692
8010 Dixie Blanchard Rd
Shreveport, LA 71107
Phone # 318-424-7867
r_reeves61@bellsouth.net
Best $25.00 I ever spent

I still use the Hornady tool for holding the bullet to the lands but the RP tool for the actual measurement. Get very consistant readings

But the trick with the Hornady tool is to use light pressure and the same everytime. I did not have much luck with toggling it back and forth at the lands. Seat the modified case firmly into the chamber and rotate a little to make sure it is all the way in the chamber, set the bullet deep in the modified case, release the lock stem on the gray rod and with one finger lightly but firmly with one motion push to the lands.

You will have a difference because of headspace on non-belted modified cases

For example on my 06, MODIFIED CASE datum measurement


FIRED CASE datum measurement


The good thing is that the modified case datum measurement difference will put you FURTHER from the lands than you think you are, which will keep you from seating into the lands and increasing pressure

Not a big deal cause as someone has mentioned, it is all relative and as long as you do it the same, no problem

It is nice to have 2 flat surfaces on the RP tool to take the final measurement

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