Ogive to base measurements.

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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
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Forum rules
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.

Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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ovenpaa
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Ogive to base measurements.

#1 Post by ovenpaa »

As part of an ongoing project to measure the point where the Ogive meets the lands back to the base of the bullet I built a little fixture this morning. This is for 7mm Berger 180's. Using an off-cut of aluminium I bored a .290" diameter hole reducing to 5mm with a 45 degree step at around where the ogive would meet the lands, there is also a chamfer on the start of the bore to make sure the bullets are not marked in anyway.

The fixture is bolted to the base of a Sinclair fixture used for checking bullet run out. I will need to make a slightly longer mast as the standard one is barely long enough. The plan is to build some little dedicated fixtures on granite blocks with interchangeable fixtures for whatever bullet is needed.

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Image

Apologies for the crap pictures from my iFone.
/d

Du lytter aldrig til de ord jeg siger. Du ser mig kun for det tøj jeg har paa ...

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spud

Re: Ogive to base measurements.

#2 Post by spud »

:) :) :) ;)
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ovenpaa
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Re: Ogive to base measurements.

#3 Post by ovenpaa »

I just measured a group of 180 VLD's and they were all within a tenth of a thou. One thing I did notice was the mast which is made out of 8mm stainless flexes slightly so new ones will be 10mm x 130mm
/d

Du lytter aldrig til de ord jeg siger. Du ser mig kun for det tøj jeg har paa ...

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spud

Re: Ogive to base measurements.

#4 Post by spud »

ive just weighed a 1000 of the same bullet dave all same batch number there was .3 grains differnce betwean highest and lowest 18.0 dead to 180.36 extreme ranges
Robin128

Re: Ogive to base measurements.

#5 Post by Robin128 »

COAL varies as a function of your measurement to the ogive of each round, right?...what about then the varying capacity of the cartridge? IE pressure.

Or was that too stupid a question... even for me... :lol:
Robin128

Re: Ogive to base measurements.

#6 Post by Robin128 »

You are attempting to keep distance to lands constant?
spud

Re: Ogive to base measurements.

#7 Post by spud »

Robin128 wrote:COAL varies as a function of your measurement to the ogive of each round, right?...what about then the varying capacity of the cartridge? IE pressure.

Or was that too stupid a question... even for me... :lol:
personally i will weigh every casde and h20 it after fireforming for further segregation
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dodgyrog
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Re: Ogive to base measurements.

#8 Post by dodgyrog »

Some people will go to the far end of a fart!
Purveyor of fine cast boolits.
All round good guy and VERY grumpy old man.
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ovenpaa
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Re: Ogive to base measurements.

#9 Post by ovenpaa »

It all helps when the only bit we are interested in is 5" across at 1000 yards or more.

There are many steps you can take to get to the ultimate loaded round, some I take some I don't, the important things are repeatability and feeling good about what you have done, it is one less worry at the firing point.
/d

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dodgyrog
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Re: Ogive to base measurements.

#10 Post by dodgyrog »

I like stalking up close and personal! 1MOA works for me.
Each to his own.
Purveyor of fine cast boolits.
All round good guy and VERY grumpy old man.
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