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solid heavy bullet's stabilisation problem

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23 July 2008, 17:22
yes
solid heavy bullet's stabilisation problem
Hi
i have heard that brno rifles in 375H&H have a rifling twist of 1/14 inches. if true ?!! did anyone have stabilsation problem with 300 grain solid monlithic bullets in his brno 602 model rifle?
regards
YES


Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery.
23 July 2008, 18:47
jvw375
None whatsoever at 2 500 ft/sec.
24 July 2008, 05:19
Andy
Yes,

For what its worth:

In my 1-14 twist Whitworth which has a 1-14 twist, a FMJ Hornady RN only penetrated 6 inches more than a 300 grain Nosler partition when fired into 5 gallon cans of water.

(3 1/2 cans).

The FMJ turned over 180 degrees and was worn smooth on one side of the bullet, and had obviously traveled some distance base forward. But the Hornady is a stoutly made bullet and it did survive intact.

Accuracy (in air) was fine!

I have used the 5 gallon farm chemical cans to test bullets for about 30 years and they correlate very closely to ones recovered from big game (bison buffalo and elephant).

Andy
24 July 2008, 11:11
yes
Hi Andy
Do you mean 1/14 is a bad option for 375H&H? wonder why CZ is writing in their website that their rifles have 1/12 and some people say it is not true and all brno and Cz rifles in 375H&H have 1/14 twist Confused who is telling the truth?.
regards
YES


Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery.
25 July 2008, 01:22
Andy
Yes,

If you are shooting 250-275 grain soft points in your .375 I dont think it will matter much if it has a 1/14 twist.

If you plan to shoot monometal 300 grain bullets, like the Barnes X, or any of the RN or FN solid monometal bullets, it probably will.

Maybe someone here at AR will measure the twist of their .375 CZ550 for you.

Andy
25 July 2008, 04:58
JTurk
I have a Browning Olympic grade built about 1963 on a commercial FN Mauser action, with a 1:14 twist barrel. It shoots well with most non-monolithic 300 grain bullets. On a lark I decided to try the 300 grain Barnes TSX and expected that the bullets would hit the target sideways. Not only was I wrong, but the load I developed for the 300 gr TSX (F215, 75 gr Ramshot Big Game) turns out to be the most accurate load I have ever used in the rifle. Go figure. The load chronographs at 2550 fps, and 100-yd three-shot groups are typically less than one inch, with several less than 1/2-inch.