bullet length database?

[jayd4wg]

looking at different projectiles today I remember reading about a formula to calculate the optimal bullet for a given rifle that uses bullet length, MV, RoT to determine the optimal bullet for a given velocity in any rifle. running quick figures on my stick came up with a 1.49" bullet. So off to sierra's website I go and lo and behold - no bullet lengths.

Anyone know where there is a list to be had?? I'm kind of a number crunching spreadsheet freak and would LOVE to develop a MV/bullet chart to streamline the whole "educated guessing" part of reloading. Not that I won't have fun, but it would be an interesting backwards approach to the current trial and error or walking in someone else's shoes method used by most.

How about a list of avail bullets with their "optimal stabilization velocity for a given twist?"

my head hurtz.

 

[DocB]

Re: bullet length database?

Jason,

I believe Jason Baney at 6mmBR.com had some bullet length data for different calibers and weights. I don't have a link handy. LTR David may have also had some of that data for .308 calibers, but I haven't checked his site in a while.

As long as the bullet isn't keyholing, your twist rate is O.K.

HTH,
DocB

 

[The Mechanic]

Re: bullet length database?

I think this is the link you want.
http://www.jbmballistics.com/cgi-bin/jbmmpm-5.0.cgi

http://www.jbmballistics.com/lengths/lengths.shtml

http://www.jbmballistics.com/cgi-bin/jbmstab-5.0.cgi

wingyro may also help

http://www.stickledown.co.uk/

 

[jayd4wg]

Re: bullet length database?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: The Mechanic</div><div class="ubbcode-body">I think this is the link you want.
http://www.jbmballistics.com/cgi-bin/jbmmpm-5.0.cgi

http://www.jbmballistics.com/lengths/lengths.shtml

http://www.jbmballistics.com/cgi-bin/jbmstab-5.0.cgi

wingyro may also help

http://www.stickledown.co.uk/ </div></div>

perfect...and now as I thought, my "optimal" bullet length puts me in the 180's. Every factory 180 load shot like shit. back to the drawing board - my gun likes 150's, but it MIGHT be due to the pillar bedding. I'm just not ready to grind down the pillars to free float the barrel yet. I'll split the difference when I start loading and move up to the 165's from the 150's. I'm still gonna load them hot though (working up to that load of course...this reloading shit is a sickness. I better not have another bang stick follow me home any time soon.

 

[The Mechanic]

Re: bullet length database?

I know you are saying you want to make a few hot ones. Have you thought of some lighter ones too? Just a thought.

 

[jayd4wg]

Re: bullet length database?

absolutely. I have a six year old who will be shooting this thing soon enough too. I'm still working on his sight picture with my 22mag - he has pretty thick glasses and does well with a red dot right now, but has a hard time with a full telecopic. another year on the 22 and he should have grown into a full youth stock too. So yeah...light loads are on the radar - but for the next year or so, this thing is ALL mine

 

[The Mechanic]

Re: bullet length database?

Cross eye dominance? Have you checked to see which eye is dominant?

 

[jayd4wg]

Re: bullet length database?

he's right eye, it'just that he has a bad strabismus(sp?) and his glasses are horrible. he's not a candidate for surgery so our hope is that the glasses gradually correct, and so far they are working. Once he gets to the point that the surgery will work, he wants to do it. he hates his specs.