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Hunting >> Hunting in Africa & hunting dangerous game

Grizzly
.333 member

Reged: 05/12/05
Posts: 359
Loc: Dallas, Texas, USA

Re: Which theory of bullet performance do you believe?
12/02/07 07:38 PM

Number 1, but number 3 has its appeal.

The biggest issue I run into with heavier bullets, at least in a double rifle, is that the heavier weight in a copper bullet makes the bullet longer and at a point not suitable for standard twist rates.

In a bolt rifle, it is difficult enough to try to get a heavier bullet to work because of its length.

I am still playing with the heavies in trying to get working loads. It is tough to push them faster in standard twist barrels. So, I am trying to fine the sine wave sweet spot for lower velocities.

I agree with Kevin's theory generally, but for large game you need a minimum velocity range to be effective. 2100 to 2400 fps seems to be the consensus for 400 to 500 grain bullets.

Back it down too much, and you have nothing more than a +P 45-70.

Interesting is that with the driving bands in GS and Northfork bullets, you can get more velocity with standard loads. But the heavier bullets are an issue with a 1:20 twist.

The only option I can see is to find a metal heavier than copper which will reduce the length of the bullet. I believe tungsten may be an option in the future (Speer used to carry them and Federal just came out with their MRX tungsten cores).

The heavy copper bullets are great if you don't mind changing barrels. Kind of tough to do with a double rifle or classic bolt rifle.

It is going to be interesting to see how Norma's new PH line fares. Supposidely, the increased weight on some of their ammo (e.g., 416 Rigby going from 410 to 450 grains) will work in standard twist rifles. I do know PH's in SA shooting 416 Rigbys have been using 430 grain Rhino bullets in their older rifles, and rave about the results.

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Subject	Posted by	Posted on
Which theory of bullet performance do you believe?	500grains	10/02/07 08:36 AM
Re: Which theory of bullet performance do you believe?	mikeh416Rigby	12/02/07 10:21 AM
Re: Which theory of bullet performance do you believe?	NitroX	12/02/07 02:10 PM
Re: Which theory of bullet performance do you believe?	hoppdoc	14/02/07 10:22 PM
Re: Which theory of bullet performance do you believe?	Gerard	14/02/07 11:50 PM
Re: Which theory of bullet performance do you believe?	500grains	15/02/07 02:25 AM
Re: Which theory of bullet performance do you believe?	Gerard	15/02/07 03:43 AM
Re: Which theory of bullet performance do you believe?	hoppdoc	15/02/07 06:05 AM
Re: Which theory of bullet performance do you believe?	Grizzly	15/02/07 03:02 PM
Re: Which theory of bullet performance do you believe?	Grizzly	15/02/07 06:11 PM
Re: Which theory of bullet performance do you believe?	hoppdoc	15/02/07 06:26 PM
Re: Which theory of bullet performance do you believe?	Gerard	16/02/07 01:07 AM
Re: Which theory of bullet performance do you believe?	500grains	13/02/07 04:52 AM
Re: Which theory of bullet performance do you believe?	jorge	13/02/07 06:47 AM
Re: Which theory of bullet performance do you believe?	Ndumo	13/02/07 07:50 AM
Re: Which theory of bullet performance do you believe?	butchloc	14/02/07 05:32 AM
Re: Which theory of bullet performance do you believe?	Grizzly	12/02/07 07:38 PM
Re: Which theory of bullet performance do you believe?	Marrakai	12/02/07 10:36 PM
Re: Which theory of bullet performance do you believe?	AzGuy	11/02/07 10:43 AM
Re: Which theory of bullet performance do you believe?	bonanza	11/02/07 01:16 PM
Re: Which theory of bullet performance do you believe?	Bonde	12/02/07 06:30 AM
Re: Which theory of bullet performance do you believe?	EricD	11/02/07 06:13 AM
Re: Which theory of bullet performance do you believe?	Kalunga	11/02/07 06:56 AM
Re: Which theory of bullet performance do you believe?	allenday	11/02/07 05:28 AM
Re: Which theory of bullet performance do you believe?	NE450No2	10/02/07 12:25 PM
Re: Which theory of bullet performance do you believe?	NitroX	10/02/07 12:48 PM
Re: Which theory of bullet performance do you believe?	hoppdoc	10/02/07 02:22 PM
Re: Which theory of bullet performance do you believe?	ozhunter	10/02/07 06:23 PM
Re: Which theory of bullet performance do you believe?	500Nitro	10/02/07 10:05 AM
Re: Which theory of bullet performance do you believe?	bulldog563	10/02/07 10:09 AM
Re: Which theory of bullet performance do you believe?	Marrakai	10/02/07 11:45 AM

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