Help with bullet sorting!!!

[mikecr]

Oops, I didn't mean to add my line in with the quote. Not sure how to fix it without starting over.

Modify post & move '[/quote]' (cut/paste) to the end of 'Pressure Difference!'

 

[Dave Brown]

+1 on the Bob Green Comparator Tool

 

[Ghengisahn175]

Does the bob green comparator make he hornady comparator useless In a sense ?

Still trying to figure out if I need to sort by base to ogive (litz method) or seating stem (bob green).

 

[mikecr]

There is nothing like the Bob Green Comparator (BGC) out there, so you can't compare it to anything else.

It's not for measuring lengths.
The BGC provides comparative qualification of ogive radius. With this, it qualifies bullet nose datums from which other measurements are based.
This would be the first measure taken with bullets.

Where you're measuring 'base to ogive' you're really measuring 'base to an ogive datum'. You're already dismissing multiple parameters in this, and one of them is the nose datum itself.
Others:
End diameter
Base angle
Base length
Bearing length

Where you're 'uniforming meplats' you're really 'trimming nose lengths from an ogive datum'. Until those datums are qualified/matching, you're in no way uniforming.

 

[M14AMU]

Are you also 'indexing' the primers??

 

[Ghengisahn175]

Mike are you saying sort bullets using the bcg and for checking to lands and measuring jump use the hornady bullet comparators?

 

[mikecr]

You got the jest of what I'm sayin.

 

[Joe Salt]

Well Mike I guess I've been doing it all wrong all these years using the JB Comparator! And two different bushing that let me know when I get Fat ones. And believe me don't mix lot# with bullets.

Joe Salt

 

[mikecr]

I use two bushing to sort my bullets, Its the fat and skinny ones the will kill you at long range. Pressure Difference!

This I can believe, but bearing diameter is it's own parameter just like all the others.
Diameters deltas considered from a bearing surface comparator(BSC)(JB) could be that, or bearing length, or ogive radius. Of the three different things, which is it? Or is it all three?

You couldn't assume a varying nose datum = diameter variance, or = bearing length variance.
The nose could be perfect while bearing length and/or diameter is different.
The diameter from which a perfect nose originates could be off while bearing length is countering..
If ogive radius is off neither of the other two are known from that comparator...
Three different things can combine to mean something or relatively nothing.
Now throw 'base to ogive' into consideration and the variables in combination skyrocket far from credible.

Joe, if bearing diameter is your basis of measure, sounds like a good one, you should actually measure that.
Caliper, micrometer, good indicator, go/no-go gage(holes validated w/pin gages). Maybe you do with suspect comparator readings.
Anything but assumptions from that comparator alone..

On the bullet hole block, there was someone around here recently that commissioned help to have one built. Sounded like it worked well with the hole edges taper reamed. The bullet would barely drop through one hole in the block. About that hole would be slop, or no-drop.