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Joined: Mar 2006
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Campfire Tracker
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Campfire Tracker
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I've used the Hornady gauge set since it was made by Stoney Point. Finding the preferred land to ogive distance is the final step for all my load work up. I've found that close to the lands is nice, but not necessary in all cases.
molɔ̀ːn labé skýla
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Joined: Nov 2005
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Campfire Ranger
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Campfire Ranger
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As "woods" posted above, I too have found variations in bullet weight and length which transferred into a different COAL to maintain a target "gap". I also found a change in bullet ogive in different boxes of Partitions, which reflected there differing bullet length.
My home is the "sanctuary residence" for my firearms.
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Joined: Dec 2007
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Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2007
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Example 200 gr Accubonds I have found similar differences in Nosler Partitions. Also Hornadys but not as great a variation. My solution to the quandary is to slowly approach the OAL when seating for each individual bullet using the Hornady OAL tool in my big game hunting loads. Real PITA. Not as worried about small discrepancies in my varmint loads.
Ed
A person who asks a question is a fool for 5 minutes the person who never asks is a fool forever.
The worst slaves are those that put the chains on themselves.
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Campfire Tracker
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Campfire Tracker
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As "woods" posted above, I too have found variations in bullet weight and length which transferred into a different COAL to maintain a target "gap". I also found a change in bullet ogive in different boxes of Partitions, which reflected there differing bullet length. To add to this - in some cases, particularly OTM style bullets, one could go nuts trying to figure out the variations in OAL that results from different nose lengths of the bullets. I loaded a few hundred 75gr Hornady BTHP bullets in 5.56 the other night; ogive length was very consistent, but OAL varied from 2.245" to 2.260", and one box required deeper seating than the other to stay within magazine length. If I had been going by OAL alone, it could have been very frustrating, and I've had ended up with two different batches of ammo at two distances off the lands.
Last edited by Yondering; 09/20/16.
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Joined: Mar 2001
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Campfire Outfitter
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Campfire Outfitter
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I use the same ogive measurey thingy that woods showed in his pictures. A side benefit to that is that the red body can be used with an different insert for a shoulder headspace datum measurey thingy. I use it more for setting up my dies for proper headspace than I do measuring ogives.
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Joined: Aug 2003
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2003
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I use the Hornady tool and measure ogive. Seems to work well for me.
Me
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Campfire Outfitter
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Campfire Outfitter
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Just to be different, I use the Forster thingy.
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Joined: May 2014
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Campfire Regular
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Campfire Regular
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I just measure to the bullet tip and call it good. The other chit is way over rated.. . Yep! 👍 Shod
Last edited by Shodd; 09/21/16.
The 6.5 Swede, Before Gay Was Ok
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Campfire Tracker
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When loading Barnes or other copper bullets I always use the Hornady tool to work up the load. Once I have the correct seating depth for the rifle set on the die I do not keep checking anymore. I have found that seating depth does not change more than a thou or two with them and that change does not seem to affect accuracy noticeably. Got outside of .005 and I have see change though.
Cup and core bullets I set up with the Hornady tool as well, but they are much easier about seating depth.
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Joined: Jun 2011
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Campfire Regular
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Campfire Regular
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Where the tip of the bullet sits in relation to the lands is of little consequence.
Where the ogive sits in relationship to the lands is of great consequence Exactly. That being said, I do both. I use Sinclair comparators mostly, but have Hornady also. I guess it just depends on the rifle/usage. For match loads, I am very particular. For hunting loads, I often just measure tip and go with max mag length...... +1
Used to be bobski, member since '01
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Joined: Jul 2004
Posts: 347
Campfire Member
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Campfire Member
Joined: Jul 2004
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sounds interesting and available is there a consistent difference between bore and grove diameters between different calibers? if not, how does one know those dimensions?
thanx
vires,fortitudo,vigilantia
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Campfire Kahuna
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Campfire Kahuna
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You can look on the SAAMI (Sporting Arms & Ammunition Manufacturers Institute) website for specifications of each round, but but in general .22 centerfires have a .220" bore and .224" grooves, cartridges from .243 to 7mm have a .007" difference between bore and grooves, and .30 and up have a .008" difference. A .308 Winchester, .30-06 or .300 Magnum will have a .300" bore and .308" grooves.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Campfire 'Bwana
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Campfire 'Bwana
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I just measure to the bullet tip and call it good. The other chit is way over rated.. . Yep! 👍 Shod Same here for my needs.
Conduct is the best proof of character.
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Joined: Jul 2004
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Campfire Member
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Campfire Member
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vires,fortitudo,vigilantia
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