Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by gahlizard, Nov 2, 2008.

1. ### gahlizardWell-Known Member

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could anyone speculate the B.C. for the upcoming 300 grain .338 bullets.
i thought i read that it might be close to .900?

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Mar 8, 2007
I'll stick my neck out there and make an estimate.

These numbers are based on the dimensions of the bullets, and a database of information I've compiled that relates measured (tested) BC to bullet geometry. This method results in estimates that are typically within +/- 3% of the measured BC.

The BC's are average from 3000 to 1500 fps.

300 grain Tangent (non-VLD) ogive:
estimated G1 BC: 0.749 lb/in^2
estimated G7 BC: 0.384 lb/in^2

300 grain Secant (VLD) ogive:
estimated G1 BC: 0.855 lb/in^2
estimated G7 BC: 0.438 lb/in^2

For best results when doing trajectory calculations for these bullets, use the G7 BC if your program allows.

I'm very curious to test these bullets and see how accurate the estimates are.

-Bryan

3. ### Longshot38Well-Known Member

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May 3, 2008
I have been told by good sources that the new bergers will have a BC in excess of .9!

4. ### MagManWell-Known Member

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Keeping my fingers crossed but not holding my breath.

Surely they will try to out do the SMK but by how much. Your guess is as good as mine.

5. ### edgeWell-Known Member

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Any idea on the twist required for those bullets?
Where can the specs be found?

edge.

6. ### MagManWell-Known Member

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They'd be silly if they didn't design it around a 10 twist. As has been said before there is a plethora of 10 twist factory chamberings and aftermarket barrels surely they wouldn't manufacture a bullet that required a special twist....Hopefully.

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The bullets are designed to be comfortably stable in a 1:10" twist in all conditions.
-Bryan

8. ### edgeWell-Known Member

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Thanks for the replies

edge.