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338 cal, 295 gr, and 1.010 BC???

L

LR338nut

Sergeant
Full Member
Minuteman
Jan 13, 2009
184
0
52
Umitilla County, Or
#1
can someone here confirm the BC on this bullet? Or vouch for this company before I spend a few thousand bucks
grin.gif



http://www.gsgroup.co.za/338295SP142.html
 
#5
Re: 338 cal, 295 gr, and 1.010 BC???

Here is some information on G drag models.

http://www.perry-systems.com/Gmodels.pdf

Introducing Gmodels a Ballistic Analyzer for the studious shooter. It will appeal to the engineer in all of us. The development of Gmodels began several years ago to enable Perry-Systems to explore ballistic applications. It has been upgraded over the years as new technology has been introduced. Here are the main features of Gmodels.
1) A very flexible interface for the user to select units for temperature, pressure, distance, etc from pull down lists.
2) The ability to choose aerodynamic drag models G1, G2, G3, G4, G5, G6, G7, GL, and GS.
G1 is by far the most common model used today. However the use of the G7 model for VLD bullets is now popular with long range shooters. (After all this is what these bullets are for).
3) Either of the ICAO or the ASM atmospheric models can be selected.
4) Multiple ballistic coefficients (velocity zones) can be used.
5) Gmodels consists of two primary components, a Trajectory calculator, and a BC value calculator.
6) The Trajectory Calculator will generate a trajectory report on the main screen in a scroll down window. (see screen shot on page 2) It also has the following options.
a) Output the Trajectory report to a tab delimited text file which can be imported into Excel for enhancement and additional analysis.
b) Point blank range analysis.
c) Enter multiple wind profile values.
d) Estimation of spin drift.
e) Snapshot view of atmospheric parameters (air density and sound speed).

Cheers,

Master Diver
 
#6
Re: 338 cal, 295 gr, and 1.010 BC???

I got to lookin' at their products and see they have a 197gr .308 with a G1 just over .8! I'll have to try them one of these days. I've heard that the monometal bullets aren't as accurate out of typical barrels thought do to the slight choke that some barrels have. What's the consensus on that?

Branden
 
#8
Re: 338 cal, 295 gr, and 1.010 BC???

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Dust_Remover</div><div class="ubbcode-body"> I've heard that the monometal bullets aren't as accurate out of typical barrels thought do to the slight choke that some barrels have. What's the consensus on that?

Branden </div></div>

As a general rule of thumb solids like tighter bores and lots of grooves. For example lawtons "lost river bore" is a tight bore in a 8 groove configuration. However I have heard reports of people shooting solids well out of bores with more traditional configuration.
 
#9
Re: 338 cal, 295 gr, and 1.010 BC???

I can affirm that they shoot very well from standard bore diameters, and rifling geometries. Not all solids are equal however, any more than all jacketed projectiles are.

In terms of potential, a properly designed solid can not be surpassed for repeatable accuracy, ballistic coeffficient, or launch deformation stability.
 
#11
Re: 338 cal, 295 gr, and 1.010 BC???

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Master Diver</div><div class="ubbcode-body">The 197 grn SP .30 cal bullet is a fine long range bullet for any .30 cal rifle. But you need 1:8 twist or faster LGT barrel to stabalize this bullet.
Here is the data sheet:

http://www.gsgroup.co.za/308197SP204.html

Cheers,

Master Diver </div></div>

Holy cow, 1:8!! Who makes 1:8 for .30's?? I always was under the impression that 1:10 was as fast as they are made for the .30's.

Oh it would be tempting to build a rifle around that bullet. I used the G1 BC of .737 for the .308 range of velocities, and in the conditions I use for local shooting, it's supersonic to 1600 yards!!!! I'm not sure I would be able to shoot much of anything else with a 1:8 other than the super heavies from a twist that fast.

Branden
 
#12
Re: 338 cal, 295 gr, and 1.010 BC???

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Dust_Remover</div><div class="ubbcode-body">
Holy cow, 1:8!! Who makes 1:8 for .30's?? I always was under the impression that 1:10 was as fast as they are made for the .30's.

</div></div>

Rock creek, Pacnor (makes 1:6.5 I think). You need a fast twist for .300 whispers as well.
 
#14
Re: 338 cal, 295 gr, and 1.010 BC???

I agree with Harvey, aint no way this bullet has a G1 of 1.66. I am highly skeptical that it would even have a 1.01 G1 value.
 
#16
Re: 338 cal, 295 gr, and 1.010 BC???

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Master Diver</div><div class="ubbcode-body">The BC is calculated with a G5 drag profile.
Yoy will need 1:8 twist or faster LGT etc. to stabilize this bullet.

Cheers,

Master Diver
</div></div>

Lindy, here is what I was referring to.
 
#19
Re: 338 cal, 295 gr, and 1.010 BC???

The B.C. is actually true, to the best of their ability. It is much closer then any other manufacturer, and it is G1. Please check out the link. What is most impressive is not just the starting velocity B.C., but also the B.C. at the transonic barrier! This bullet can, and has, outrun the 750 A-Max, without question. If you would like to know more, I would be happy to help. You can e-mail me or call 260-715-5078. Busy sometimes, but I'll get back to you as soon as I can.

http://www.gsgroup.co.za/338295SP142.html

-Anthony
 
#20
Re: 338 cal, 295 gr, and 1.010 BC???

In my experience the 232gr. .338 bullets perform very well. The only thing Ive found to be of issue is they are very long and basically require single shot feeding. AS far as uniformity I think they are second to none; there is no such thing as bullet sorting for base to ogive or weight variance. my 338 is a 9.8 twist otherwise i'd have the 295's no question.
 
#21
Re: 338 cal, 295 gr, and 1.010 BC???

I agree! The bullets are somewhat long, but that is what you must do to get B.C. I have loaded them to recomended COAL and done well, and the bullets center precisely in the freebore, so accuracy is second to none! If you like shorter bullets, they have them. The B.C. does suffer, but the speed makes up for it, until you reach 1300 yards or so. In a receint test, the 232 outran the 300MK out to 1600 meters, and blew it away at 1000 or less! I also like their uniformity/consistancy! They hold their tollerances to less then 5 micron! That's 1/4th what anyone else is doing! Oh, and no need for gain twist, forgot to mention that before. Receintly worked with them to develop a 1.3+ B.C. .375 for the Snipe-Tac and a 1:7.5 twist...no gain, and it's been working very well! Back to the 295 grain .338; I was able to get 167fps gain over the 300MK, and without even trying much! I would recommend you give GS Custom bullets a try if you haven't already, just follow the twist recomendations and you can't go wrong! Oh, let's not forget their HV (hollow point, Hight Velocity)! They don't even list their .510 790 grain HV/HP, but it's one hell of a bullet! I still get excited every time I think about them :)

-Anthony
 
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