bullet ogive

[joemusso]

i am using .30 cal 175 SMK
i measured 100 bullets today i am getting .432 .433 .434 .435 .436

my major amount is the .434 length. should i put the .435 of .433 with it or both?

what is the +/- amounts of separation?

thank you
joe

 

[zgilbert]

Re: bullet ogive

Joe,

It depends are you comp shooting? I have loaded in the past plus or minus .001 but no more. use the others as sighters. just my two cents.

 

[Conqueror]

Re: bullet ogive

I group them by 0.001 except for the outliers at either end of the spectrum, which I shoot for practice only. I assume these are base-to-ogive measurements? I use a double comparator setup and measure the actual bearing surface.

 

[joemusso]

Re: bullet ogive

i do not shoot competitively. i just want the best i can get.
i use a Redding instant indicator with dial indicator.

im trying to work up to shoot comp.
i figured it was +/- 0.001 but did not know for sure.


thank you guys for the great info.

 

[707electrician]

Re: bullet ogive

Are you guys weight sorting the bullets too?

 

[joemusso]

Re: bullet ogive

i weight sort the bullets and brass

 

[Conqueror]

Re: bullet ogive

I weigh-sort brass but have not tried with bullets yet. I haven't found any good information on whether weight-sorting or length-sorting bullets will give more significant gains in consistency. I don't want to bother with doing both, because I would have to sort hundreds to come up with a decent amount of bullets that are all the same length AND weight. However, I do plan on keeping these statistics as I experiment, and will make the data available publicly once I have enough to bother summarizing it.

 

[zgilbert]

Re: bullet ogive

Yes I weight both the brass and the bullets. It honestly makes a difference. it gets you closer to bug holes!

 

[Unknown]

Re: bullet ogive

An acquaintance of mine who shoots world class 1000 yard competitions weight sorts all the brass and bullets. Heavy brass and light bullets are paired, as is light brass and heavy bullets. He says this seems to even out some of the variation...but these lots are kept as separate ammo lots. He also measures to ogive.

However, he sorts through thousands of bullets. All are kept sorted according to both weight and length to ogive, and loaded accordingly.

I just don't have that much interest in sorting, nor do I have the financial backing to be able to buy thousands of bullets and hundreds of cases to sort through. I'm pretty stoked when I get to buy a thousand bullets that are all from the same lot. He buys thousands from one lot just to sort.

But then he is a factory sponsored shooter...the financial backing sure helps.