I'm trying to find out if anyone on the forum might know somebody who could make a custom tool to measure bullet diameters. The tool would be about 4" long and 1" wide with 3 holes drilled....they would be .2433", .2435" and 2437". They would have to be smooth enough to prevent bullet damage and hard enough to prevent any wear so the hole diameter remains the same forever.
Re: Bullet Diameter Measuring Tool - Finally Finished
- Thread starter PMA3
- Start date
Re: Bullet Diameter Measuring Tool
I have a Starrett mic that reads to .0001" but measuring each bullet and measuring the exact same spot (pressure ring) each time would be a chore for sorting 500 bullets at a time. The tool I'm looking for would be in .0001"
(Example .2433") .... you would slide the bullet into the hole(s) and they would act as a GO/NO GO gauge...if they don't fit the .2433" hole but slide through the .2435" hole, then I would know the approx. diameter and how to sort them fairly quickly.
I have a Starrett mic that reads to .0001" but measuring each bullet and measuring the exact same spot (pressure ring) each time would be a chore for sorting 500 bullets at a time. The tool I'm looking for would be in .0001"
(Example .2433") .... you would slide the bullet into the hole(s) and they would act as a GO/NO GO gauge...if they don't fit the .2433" hole but slide through the .2435" hole, then I would know the approx. diameter and how to sort them fairly quickly.
Re: Bullet Diameter Measuring Tool
Your method may be potentially faster but the assumption is that it would be easy to remove the bullet once it catches at a specific hole. Don’t know, may work but you won’t know until you try it for real.
Another method would be to make a small cup that can be attach to the left arm of the micrometer that the bullet can be dropped into that acts as a stop. That way you can be pretty sure that when you dial in the micrometer that it is measuring the same place on the bullet.
Your method may be potentially faster but the assumption is that it would be easy to remove the bullet once it catches at a specific hole. Don’t know, may work but you won’t know until you try it for real.
Another method would be to make a small cup that can be attach to the left arm of the micrometer that the bullet can be dropped into that acts as a stop. That way you can be pretty sure that when you dial in the micrometer that it is measuring the same place on the bullet.
Re: Bullet Diameter Measuring Tool
A no-go/no-go would be faster
.2435 and larger no-go
.2430 and smaller no-go
Everything else is guaranteed to be between .243 and .2435
Adjust dimensions as you like.
As for stuck bullets, use steel for gauge and ice/heat to contract the bullet or expand the gauge.
I won't do it.
A no-go/no-go would be faster
.2435 and larger no-go
.2430 and smaller no-go
Everything else is guaranteed to be between .243 and .2435
Adjust dimensions as you like.
As for stuck bullets, use steel for gauge and ice/heat to contract the bullet or expand the gauge.
I won't do it.
stool
Re: Bullet Diameter Measuring Tool
at what temp ??
.0001 can change in temp changes...
??
at what temp ??
.0001 can change in temp changes...
??
PMA3 said:
stool
Re: Bullet Diameter Measuring Tool
get a digital mic.....
been there done that....it works..
get a digital mic.....
been there done that....it works..
Erik Cortina
Team Lapua Brux Borden Captain
Re: Bullet Diameter Measuring Tool
Now the big question. What's the purpose of measuring bullet diameter?
Now the big question. What's the purpose of measuring bullet diameter?
Re: Bullet Diameter Measuring Tool
Just use neck bushings. A .243 bushing can be any where from .2427 all the way to .2437. Get several different ones and start pushing them through. An easy way to sort into different lots.
Just use neck bushings. A .243 bushing can be any where from .2427 all the way to .2437. Get several different ones and start pushing them through. An easy way to sort into different lots.
Re: Bullet Diameter Measuring Tool
Measuring bullet diameter is just another step in trying to get all those 10 record rounds as close to identical as possible. I currently have 3500 6MM Berger 108BT's from the same lot# and a random sampling shows most to be .2433"-.2434". What I'm trying to avoid is having one sneak through that measures .2437'- .2438" because I really believe that bullet won't shoot to the same POI as the other 9 at a 1000 yards. The tool would be used to "sort out" any odd balls and provide the peace of mind that any bad shot is shooter error, not my components. I already go through many, many steps to try and perfect the cases and bullets, so one more isn't a big deal for me.
Also, my tight neck is .2670" and I'm already running .002" or less clearance, with loaded rounds hovering around .2650"-.2652" with bullet measuring .2433"-.2434". If the bullet measures .2438", that would add another .0004" to .0005" (best case loaded round .2654", worst case .2657") and WOULD BE a big deal if the bolt wouldn't close.
mikecr....please let me know if someone is willing to do a prototype....that would be great!
Measuring bullet diameter is just another step in trying to get all those 10 record rounds as close to identical as possible. I currently have 3500 6MM Berger 108BT's from the same lot# and a random sampling shows most to be .2433"-.2434". What I'm trying to avoid is having one sneak through that measures .2437'- .2438" because I really believe that bullet won't shoot to the same POI as the other 9 at a 1000 yards. The tool would be used to "sort out" any odd balls and provide the peace of mind that any bad shot is shooter error, not my components. I already go through many, many steps to try and perfect the cases and bullets, so one more isn't a big deal for me.
Also, my tight neck is .2670" and I'm already running .002" or less clearance, with loaded rounds hovering around .2650"-.2652" with bullet measuring .2433"-.2434". If the bullet measures .2438", that would add another .0004" to .0005" (best case loaded round .2654", worst case .2657") and WOULD BE a big deal if the bolt wouldn't close.
mikecr....please let me know if someone is willing to do a prototype....that would be great!
Re: Bullet Diameter Measuring Tool
PMA3, My testing has shown that larger dia. bullets were on average 45 fps faster.That would kill any hope for accuracy.The testing was in a 6.5 284.
PMA3, My testing has shown that larger dia. bullets were on average 45 fps faster.That would kill any hope for accuracy.The testing was in a 6.5 284.
Erik Cortina
Team Lapua Brux Borden Captain
Re: Bullet Diameter Measuring Tool
Call Mark Spencer at Spencer tool and grind and have him grind you some bushings with different diameters like you want.
http://spencertoolandgrind.com/
Then we would appreciate it if you do a test and post results for us to see if it made a difference or not.
Call Mark Spencer at Spencer tool and grind and have him grind you some bushings with different diameters like you want.
http://spencertoolandgrind.com/
Then we would appreciate it if you do a test and post results for us to see if it made a difference or not.
Re: Bullet Diameter Measuring Tool
amlevin....here's why I think the tool would be faster....if you take the proposed hole diameters of .2433"-.2435"-.2437" and then look at the random sample of bullet diameters of .2433"-.2434", you would take a bullet and slowly push it toward the .2433" hole, see that it won't slide through the whole way, pull it back out and try the .2435" hole....see that it slides through the whole way, then sort into the .2433"-.2434" pile. I wouldn't try and force it into the .2433" hole and get it stuck...if it won't go EASILY, I pull it out and try the next hole. I'm really looking for the ones that don't slide through the .2435" hole as they would be the "odd balls".
amlevin....here's why I think the tool would be faster....if you take the proposed hole diameters of .2433"-.2435"-.2437" and then look at the random sample of bullet diameters of .2433"-.2434", you would take a bullet and slowly push it toward the .2433" hole, see that it won't slide through the whole way, pull it back out and try the .2435" hole....see that it slides through the whole way, then sort into the .2433"-.2434" pile. I wouldn't try and force it into the .2433" hole and get it stuck...if it won't go EASILY, I pull it out and try the next hole. I'm really looking for the ones that don't slide through the .2435" hole as they would be the "odd balls".
Re: Bullet Diameter Measuring Tool
Recommend that you contact Whidden Gunworks, (229)686-1911. John has down similar for me.
Danny Biggs
PMA3 said:
Recommend that you contact Whidden Gunworks, (229)686-1911. John has down similar for me.
Danny Biggs
Re: Bullet Diameter Measuring Tool
Lets see: Excuse to buy tools.
a .0001 inside mic setup.
A selection of same size neck sizing bushings for one if my calibers.
Surface temp reader/infrared temp reader to help with consistency.
Measure the bushings and come of with 2 that match +.0002 and -.0002.
Unsolved:
How to make sure all parts and tools are the same temp?
Well, it's winter. If the workshop is heated consistently then that should do it.
I might have to eat my words just to see if it works.jfseaman said:
Lets see: Excuse to buy tools.
a .0001 inside mic setup.
A selection of same size neck sizing bushings for one if my calibers.
Surface temp reader/infrared temp reader to help with consistency.
Measure the bushings and come of with 2 that match +.0002 and -.0002.
Unsolved:
How to make sure all parts and tools are the same temp?
Well, it's winter. If the workshop is heated consistently then that should do it.
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