Bullet Pointing die Whidden

[Apie]

Naandsê aan die langpad skutters!

http://www.6mmbr.com/bulletpointer.html

Het bietjie opgelees oor die bostaande.

Wat sê die ftr en die lang afstand manne?

Kan dit rerig so groot verskil maak?

Ek luister en leer graag!

[Sangoma (IAN)]

Ek hou dop

[Francoisv]

Ek oorweeg dit om dit te begin doen. Saterdag het ek op die skietbaan met paar manne daaroor gesels. Twee doen dit en een sê dit is tydmors....

As jy al die goed doen en konstant onder 1/2moa op 100m kan skiet en jy lees die wind nie reg gaan niks jou help. Ek het Saterdag gebloei..

[Ferdi Bam]

Soos Francoisv sê daar is gemengde gevoelens hieroor. Dink dit is meer van toepassing vir die langafstande. As jy die bok n doodskoot gee op 600m gaan hy nie die verskil ken nie. Dit is ook onnodig duur en as jy geld het wat brand bevredig jou behoefte, dis al hoe jy gaan weet. Ek sê nie dit werk nie maar die grootste voorstaanders van die stelsel is die ouens wat dit verkoop. Al wat jy moet doen is om jou geweer te leer ken en genoeg te oefen dink ek. As die wind soos Saterdag waai en jy kan nie die kondisies lees nie is jy in elkgeval aan die verloorkant, ongeag. n Persoon met n "pointing die" koeël stel dalk 1 minuut en die een daarsonder stel 2 minute om in die kol te wees.

Groete

Ferdi Bam

[PWV]

Ek gaan dit toets met my potloodskerpmakertjie - die een wat met 'n slinger werk!

Grappies op 'n stokkie. Waarom sal koeëlvervaardigers dan nie hieraan aandag gee nie?

[Capt. Yoda]

http://forum.accurateshooter.com/index. ... =3874605.0

The longer the bullet the higher the potential BC for that bullet.

Trimming meplats so bullet length is consistent then pointing them up in a secondary operation inproves BC consistency but overall there's a small loss of BC from shortening them.

I recall reading somewhere (either Litz or Whidden) that the improvement is around 5% for each operation but that's in BC consistency not net gain. So I'm guessing that the pointier bullets in that box may have a BC up to 5% higher than the shortest bullets, which doesn't really amount to much in reality.

Bryan Litz

In response to the last two posts...

When I measure BC's in live fire testing, I record the SD of the BC measurement. Typically, it's 0.001 to 0.003, with 0.002 being the most common number. +/-2 SD's gives you the 95% confidence interval, which for an SD of 0.002 is 0.008 range of BC. For something like a .30 cal 185 Juggernaut, this represents less than 3% of BC variation. And remember, this measurement variation isn't just the bullet, it also includes the measurement uncertainty which can be around 0.5% to 1%.

In summary, it's typically not the case that bullets come out of the box with 5% variation in BC.

I'm not saying it isn't possible. The pictures shown in the OP are an example of very inconsistent meplats which probably result in at least 5% variation in BC. Longer bullets like the 6mm 115 DTACs are harder to make with consistent tips due to the length and excessive drawing.

Most boxes of bullets have much less than 5% variation in BC, but it is certainly possible that some boxes have more than 5%. And *IF* your bullets do have 5% of variation within a box, then uniforming them thru trimming and pointing can eliminate most or all of that variation.

When asked the common questions: "should I point?", "should I trim", "should I point and trim, or trim then point, etc..." My answer is that it depends on the shape of your bullets to begin with. If you open the box and all the meplats are the same, then you won't improve consistency at all by any amount of trimming and pointing (though you can improve the average BC by pointing). But if you open a box and can visually see a large variation in the size and shape of the tips (like those in the OP) then you can probably improve the BC uniformity and resulting vertical dispersion a great deal at long range by trimming and/or pointing.

It just depends. Look at what your working with and make a decision based on that rather than applying a blanket process which may be unnecessary.

[Boesman10]

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