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BC and also Trajectory "Advanced"
Help / Support / How-to's / Discussion related to PointBlank Software and External Ballistics in general
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Vince
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Joined: May 25, 2005
Posts: 13658
Location: Brisbane AUSTRALIA

PostPosted: Mon Feb 13, 2006 10:47 pm    Post subject: BC and also Trajectory "Advanced" Reply with quote

Gidday Dallan, I would like to put my cast 30.30 loads into PB but cannot because it requires a BC for the bullet. From your vast experience and knowledge (grovel grovel) is there a method of determining a BC for a cast bullet or is there a way or circumventing (thats my big word for the week) PB requiring a BC?

Trajectory: I have no problems bringing up a trajectory for a load. Now, I assume that the Advanced window is to put other trajectories on the grid for comparison? How do I go about using this feature? I have tried everything I can think of to no avail. The Help file doesn't give me enough info to work it out.

Cheers, Vince

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Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
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1895ss
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PostPosted: Mon Feb 13, 2006 10:59 pm    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

Vince, you need the bullet weight, muzzle velocity and the velocity at 100 yrds and Point Blank can calculate it for you. You'll find it in the miscellaneous functions. Hope it helps.

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Vince
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Joined: May 25, 2005
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Location: Brisbane AUSTRALIA

PostPosted: Mon Feb 13, 2006 11:28 pm    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

Thanks for that mate. Now I wonder if my mate will let me put his chrono out at 100m for me to shoot over with my Model 94? Hm, could be a problem here.

Cheers, Vince

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Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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1895ss
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PostPosted: Mon Feb 13, 2006 11:30 pm    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

Better to use his then your own......... Very Happy Very Happy

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Jack
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Joined: Oct 19, 2005
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PostPosted: Thu Feb 16, 2006 8:03 am    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

I think there was a chart in the back of one of the issues of 'Lyman's Cast Bullet Handbook' that listed the BC of the bullets from their molds.
Listed them by mold number, IIRC.
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DallanC
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PostPosted: Thu Feb 16, 2006 10:46 am    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

Opps. Sorry I missed this until now...

Vince wrote:
Gidday Dallan, I would like to put my cast 30.30 loads into PB but cannot because it requires a BC for the bullet. From your vast experience and knowledge (grovel grovel) is there a method of determining a BC for a cast bullet or is there a way or circumventing (thats my big word for the week) PB requiring a BC?

1895ss is right, you need muzzle and 100 yard velocities and and PointBlank can compute the true BC. Most MFG values are off a bit from real world values so its useful to test factory BCs sometimes.

Quote::
Trajectory: I have no problems bringing up a trajectory for a load. Now, I assume that the Advanced window is to put other trajectories on the grid for comparison? How do I go about using this feature? I have tried everything I can think of to no avail. The Help file doesn't give me enough info to work it out.

Cheers, Vince

Advanced Trajectory is for comparing different trajectories... I personally HATE how it works and I am taking that into account with the next version.

The way it works is you compute a normal trajectory then you entered the Advanced Menu. The last load you computed is now in the #1 slot. You need to "copy" it into other slots, then go back, compute something else, enter advanced and copy that over... repeat until you get all the loads you want in there and you can compare.

It sucks... sorry, I dont know what I was thinking at the time (well I do... it was because of how I stored the data that made it a pain to access).

V2.0 will store loads independantly and in the comparison view (note the name change) you can access "pull down" boxes to select and compare any load with any other load without even touching the ballistics menu.


-DallanC
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Vince
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Joined: May 25, 2005
Posts: 13658
Location: Brisbane AUSTRALIA

PostPosted: Thu Feb 16, 2006 10:28 pm    Post subject: Re: BC and also Trajectory "Advanced" Reply with quote

Gidday Dallan,
Thanks for the guidance mate. Don't loose any sleep over taking a little time to answer.....I know you are a busy man and do this out of the goodness of your heart.......I am assuming you don't get any recompense from the work you do.

Going to try and get a 100yd velocity, if not then the performance on the target will tell the story.

Cheers, Vince

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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