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CALIBER CHOICES

 
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  #22  
Old 06-14-2002, 07:25 PM
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Location: North, Texas
Posts: 609
Re: CALIBER CHOICES

Talk about GURUS! This is why I joined this site full of information. Glad to see that we have grown to over 660 members. My hat is off to the founders!!! Now I've learned about the B.C. whats with the V.L.D. and how does this effect a bullets design or weight? Or long range distance for hunting?
Does the material the bullet is made have anything to do with it and what does it stand for?
Darryl what would you program say for a 500gr. bullet in a 408 chey-tac necked up to accept a 510 dia. bullet at say 2400fps?
Also I was wondering for a wildcat where do you start load delvelopment? You can thank Brent for that [img]images/icons/wink.gif[/img].
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  #23  
Old 06-21-2002, 09:00 AM
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Join Date: Mar 2002
Location: Southern Illinois
Posts: 397
Re: CALIBER CHOICES

TEXAS,

I'm going off my very iffy memory bank [img]images/icons/confused.gif[/img] here so if I toss something out in error, please anyone, feel free to correct my silliness....

VLD stands for 'Very Low Drag.' The concept was pioneered by Jimmie Knox (JLK Bullets) & a few others. Basically, it's a term for a bullet design with a different degree of angle to the ogive & a generally longer more streamlined shape. From the way I understand it (which ain't sayin' a whole lot) even the shape/taper of the boattail has something to do with it. They're normally in the heavier weights for a given caliber & have a high BC.

VLDs usually do better seated into the lands a little. Some don't. I shoot Berger 70 & 80VLDs in my AR-15 service rifle. The 70s are seated to magazine length & tolerate the jump to the lands VERY well - they group very tight in rapid fire. The 80s are seated into the lands slightly. Most manufacturers wisely suggest letting the barrel/throat tell you what seating depth is best through trial & error.

I don't think Sierra MKs aren't considered true VLDs due to their ogive & overall shape. It doesn't make them any less usable, they obviously do very well in many rifles.

Well, I hope this helped & wasn't TOO far off base. DC, Warren Jensen & others - feel free to dissect my feeble attempt at an explanation.... [img]images/icons/rolleyes.gif[/img]
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  #24  
Old 06-21-2002, 12:02 PM
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Join Date: May 2001
Location: Pennsylvania
Posts: 1,757
Re: CALIBER CHOICES

Texas

The scenario you gave about the 500 gr 51 cal. from the 408 (505 Gibbs) case at 2400 FPS is really not desirable at all to me.

To me it would be a fairly good "close range" Moose gun, if that.

After running it on the computer (programed a 51 cal bullet with a BC of .900 at 2400 FPS, I find that at 1000 yards it takes 33.7 MOA to reach the target and there is 2686 FP of energy left. At 2000 yards it takes 107.7 MOA to get to target and only 1186 FP of energy. This sucks.

Lets compare that to my 338/416 with a 300 gr MK at 3300 FPS which I do get.

At 1000 yards it takes 16 MOA and I have 3300 FP of energy left. At 2000 yards it takes 47.7 MOA and still has 1675 FP of energy left.

The 338/416 wins hands down.

I would be more inclined to neck the 505 Gibbs case down to 338, use a 40" barrel, 300 gr MKs or Warrens 270 Gr 338 bullets and try for 3500 FPS in a good heavy action.

If your going to a 50 Cal bore, may as well make it the 50 BMG and be done with it.

In my opinion and for me, it's the 338/416 or the 408 period for ultra longrange hunting for elk, deer or black bear.

Hope that answered your question.

Darryl Cassel

[ 06-21-2002: Message edited by: Darryl Cassel ]
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  #25  
Old 06-29-2002, 02:52 PM
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Join Date: Sep 2001
Location: North, Texas
Posts: 609
Re: CALIBER CHOICES

Speedbump your memory is still on track [img]images/icons/wink.gif[/img] I finally got some extra time to do alot of research and found out that you are right.
DC that some eye opening [img]images/icons/shocked.gif[/img] information not good for the ego but we're not here for that. The 338-416 you have is that a variant of the Laupa or the same? The 408 would be great but like Brent said only one choice of bullet as of now.
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  #26  
Old 07-31-2002, 12:40 PM
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Join Date: Nov 2001
Location: Jackson, Wyoming
Posts: 28
Re: CALIBER CHOICES

I believe a good rule of thumb is that a BC increase of .1 is equivalent to adding about 200 fps. The velocity number may not be exact but it does show tha an increase in BC is better than trying to add a lot of bullet speed and pressure in a particular case. Also bullet shape has a lot to do with BC.

Barry
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  #27  
Old 07-31-2002, 09:10 PM
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Join Date: Mar 2002
Location: Central Minnesota
Posts: 429
Re: CALIBER CHOICES

How many of you other than I have used a 220 grain J40 with a B.C. of .930?
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