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Donut Slayer Super Member
Joined: Jun 27, 2007 Posts: 594 Location: Pensacola, Florida
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Posted: Mon Dec 24, 2012 7:08 pm Post subject: What gives on the ogive?? |
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Please excuse my play on words. Anyway, I've been getting different readings on the OAL on my reloads here recently(when using sierra bullets). I mainly load for rifle, 270 Win, 270 WSM, 30-06, and such. I have a bullet comparator and could not get constant readings from my sierra bullets. Today I had an idea and took the comparator and measured 10 bullets, from the base of the bullet to the ogive. I should get close readings, right? Well, the sierra 165SBT's had a difference of .023" . Bulk remington 165 core-loks were .010". Barnes TTSX 180's were .004". I didnt realise the sierra's ogive differed so much from bullet to bullet. That would mean a VERY inconsistant bullet jump. I wonder if this is a quality control issue? What do yall think?
_________________ Browning X-Bolt in 30'06. The work for a pet load starts again. The more people I meet, the more I like my dog. |
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wiersy111 Super Member
Joined: May 13, 2009 Posts: 2376 Location: Central Minnesota
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Posted: Mon Dec 24, 2012 8:00 pm Post subject: Re: What gives on the ogive?? |
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Hmmmmmmmmmmm that's very interesting. I want to watch this closely because the bullet seater die should seat every bullet to the same OAL. Maybe I'm missing something here. The difference in ogive measurements does seem to be excessive. I have never used a bullet comparator so I can't offer any expertise in this department.
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PaulS Super Member
Joined: Feb 18, 2006 Posts: 4330 Location: South-Eastern Washington - the State
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Posted: Mon Dec 24, 2012 8:25 pm Post subject: Re: What gives on the ogive?? |
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If I noticed a difference that large I would be on the phone to Sierra about it. Having said that I would first check to see that my bullet seating process wasn't causing the bullets to bulge as they are seated. Douse the nose of the bullet touch the seating die? I drill my punches and make sure that the punch actually pushes on the ogive rather than the tip because some bullets will deform if there is just a bit too much pressure put on the nose.
Use you comparator to measure just the bullets - right out of the box then check them again after seating. I bet you will find that the seating process is the reason and not the bullets.
_________________ Paul
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Donut Slayer Super Member
Joined: Jun 27, 2007 Posts: 594 Location: Pensacola, Florida
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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5001 Location: NC foothills
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Posted: Mon Dec 24, 2012 9:47 pm Post subject: Re: What gives on the ogive?? |
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I think you've found the problem, the bullets. Out of curiousity I grabbed a box of Sierra .358" 225 grain spitzer boattails and measured them with a .30 cal comparator (I don't have a .35 cal). All were within 0.001". Did you two run into a bad batch of bullets?
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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TRBLSHTR Super Member
Joined: Mar 23, 2007 Posts: 1071 Location: Lower 48's-left coast(near portlandia)
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Dawgdad Super Member
Joined: Feb 08, 2006 Posts: 1065 Location: On the Prairie
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Posted: Tue Dec 25, 2012 8:51 am Post subject: Re: What gives on the ogive?? |
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Base to ogive should be at +/-0.001". Ogive to tip can and will vary up to 0.010" and more on hollow points.
These may not be seconds but were mixed from different lots run on different machine set ups. Sort them or send them back.
Just for fun check out your caliper too. It may have a repeatability issue of its own. Take ten measurements of the same bullet to be sure you get the same number.
_________________ Alcohol, Tobacco and Firearms should be a convenience store, not a government agency... |
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Donut Slayer Super Member
Joined: Jun 27, 2007 Posts: 594 Location: Pensacola, Florida
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Donut Slayer Super Member
Joined: Jun 27, 2007 Posts: 594 Location: Pensacola, Florida
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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Posted: Tue Dec 25, 2012 2:13 pm Post subject: Re: What gives on the ogive?? |
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I think you found it.
Just took measurements on several of my Sierra 180 grain BTSP and came up with +/- .001...
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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5001 Location: NC foothills
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Posted: Tue Dec 25, 2012 3:56 pm Post subject: Re: What gives on the ogive?? |
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Good detective work there! Stuff like that is one of the reasons I like this bunch.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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Dawgdad Super Member
Joined: Feb 08, 2006 Posts: 1065 Location: On the Prairie
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Posted: Tue Dec 25, 2012 5:47 pm Post subject: Re: What gives on the ogive?? |
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I had a good friend that is an engineer that visited Sierra factory in Sedalia. He watched the way they set up the bullet swages and could see that you would have some lot to lot variation but should be very tight within a lot.
_________________ Alcohol, Tobacco and Firearms should be a convenience store, not a government agency... |
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trkygyd Rookie Member
Joined: Dec 25, 2012 Posts: 1
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Vince Site Admin
Joined: May 25, 2005 Posts: 15715 Location: Brisbane AUSTRALIA
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10spotterminator Member
Joined: Aug 27, 2008 Posts: 167 Location: Redmond, Oregon
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Posted: Thu Dec 27, 2012 12:10 pm Post subject: Re: What gives on the ogive?? |
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Just checked an unopened box of Sierra 30 cal. 165gr. Game King boat tails and out of 10 bullets measured had only .001 variance as well with my comparator on a set of Mitutoyo digital calipers.
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