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shootn1000
Guest
Somewhere very recently there was a thread on who has the best/reliable ojive measurer? I can not find it again. Anyway, what are your opinions? Thank you TC
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f d shuster
Guest
Ogive gage
shootn1000: For many years used the Sinclair Comparator hex style nut with a dial caliper and was always frustrated with the surfaces moving around and getting different dimensions. Recently switched to the Sinclair insert style bullet comparators, fit into the older Stoney Point comparator bodies, at a cost of $7.50 each. No more "wiggeling" around and now get consistant readings. Page 30, top right, Sinclair 2008A catalog, Part# 09-0xxx.
shootn1000: For many years used the Sinclair Comparator hex style nut with a dial caliper and was always frustrated with the surfaces moving around and getting different dimensions. Recently switched to the Sinclair insert style bullet comparators, fit into the older Stoney Point comparator bodies, at a cost of $7.50 each. No more "wiggeling" around and now get consistant readings. Page 30, top right, Sinclair 2008A catalog, Part# 09-0xxx.
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taxman
Guest
I'll second the Sinclair tool.
Bullet Anatomy
Depends on what someone is referring to as the Ogive.
The Ogive is the curved forward part of the bullet, so it would be measured in lenght.
YES? Wow! that bullet has a really long Ogive.
No? Wow! What a chubbie.
The Shoulder of a bullet is the junction between the Ogive and the Bearing Surface.
The Bearing Surface is the portion of the bullet's outer surface that contacts the bore.
I believe what is being described in the question is the measurement of the location of the Shoulder at the Bearing Surface, where the bullet will most likely engage the bore.
Consistant readings/measurements are always good unless they are consistant false readings.
I am no expert and if not correct I'm certain I will be corrected.
Depends on what someone is referring to as the Ogive.
The Ogive is the curved forward part of the bullet, so it would be measured in lenght.
YES? Wow! that bullet has a really long Ogive.
No? Wow! What a chubbie.
The Shoulder of a bullet is the junction between the Ogive and the Bearing Surface.
The Bearing Surface is the portion of the bullet's outer surface that contacts the bore.
I believe what is being described in the question is the measurement of the location of the Shoulder at the Bearing Surface, where the bullet will most likely engage the bore.
Consistant readings/measurements are always good unless they are consistant false readings.
I am no expert and if not correct I'm certain I will be corrected.
The Sinclair tool is an accurate method to measure a bullets bearing length. However the accuracy has a lot to do with measuring each bullet exactly the same way every time. If you plan on measuring a lot of bullets I would suggest the Tubb's Comparator it takes some of the human induced error out of measuring bullets.
Rodney
Rodney
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Boss Hoss 540
Guest
Use the BUHAY!! It is the best I have used. I think Tubbs sells it under his name.
Butch Lambert
Active member
Isn't the important measurement from the base of the cartridge to the leading edge of the bearing surface? If that is so, why measure from the base of the bullet to the ogive?
Butch
Butch
John Kielly
Shari's fan club
Some opine that variation in bearing surface length is a consideration for long range accuracy. On the other hand, the likes of Eric Stecker might tell us that the equipment generally used (including the operator) isn't sensitive enough to achieve consistent accurate measurements.
From my own viewpoint, I've found that I can weed out maybe a handful of rogues per thousand from the breed of projectile I normally use, just enough to make me worry about discontinuing the process.
From my own viewpoint, I've found that I can weed out maybe a handful of rogues per thousand from the breed of projectile I normally use, just enough to make me worry about discontinuing the process.
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Boss Hoss 540
Guest
Butch---for the long range guys the total bearing surface is what is important to determine pressure which translates into velocity. A diff of 70 fps vs 20 fps will mean going home with or without wood all thing being equal.
For a little more confusion take a look at this thread:
http://www.benchrest.com/forums/showthread.php?t=45798
Then read this:
http://www.6mmbr.com/medlerTUBBBSC.html
That is the Buhay Tool..
This should answer all questions relating to bearing surface and if Stecker really did say that then he is entitled to his opinion but I shoot green box anyway!
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tim in tx
Guest
butch sir i might add that
bullet depth variations can result from differing measured lengths, when i am chasing the lands i have about a .004 window of bullet depth to keep my velocities level so if i get out of that window i could drop one out or go high at any time,but with measured bearing surface that is a thing of the past .measuring can also give you a red flag if you change to a new lot of bullets and they are say .016 or more longer than your last lot then you will have to work up a new load,i have been bit by that last one.but never again. tim in tx
bullet depth variations can result from differing measured lengths, when i am chasing the lands i have about a .004 window of bullet depth to keep my velocities level so if i get out of that window i could drop one out or go high at any time,but with measured bearing surface that is a thing of the past .measuring can also give you a red flag if you change to a new lot of bullets and they are say .016 or more longer than your last lot then you will have to work up a new load,i have been bit by that last one.but never again. tim in tx
John Kielly
Shari's fan club
I shoot a lot of green box too, but after I read that, I tried remeasuring a bunch of pills I'd previously sorted & did find enough anomolies to make me decide that a .001" variation was too fine to sort on. That's the reason that I use the process mainly to get rid of the really crazy ones, the ones that are over .01" away from the norm.
I wasn't using the tool you gave the link to though, although it did use a dial gauge.
Measuring Ojive
I measure B.S. only, using Tubb's Gage. Has anyone played with different lengths of bullet and the twist of the barrel? Maybe I'm missing something but found different lengths, say longer with 30cal. work better in my 1-10 twist and longer with 1-8.5 twist in 6.5 cal. Any thoughts?
I measure B.S. only, using Tubb's Gage. Has anyone played with different lengths of bullet and the twist of the barrel? Maybe I'm missing something but found different lengths, say longer with 30cal. work better in my 1-10 twist and longer with 1-8.5 twist in 6.5 cal. Any thoughts?