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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

Grenadier
.375 member

Reged: 20/02/08
Posts: 570
Loc: North of the Columbia, USA

Re: Behind-the-bullet- 6.5-284-Norma
26/08/17 03:09 AM

Any ballistic advantage the 6.5mm has over the .277 caliber is based solely on bullet availability. The Ballistic Coefficient (BC) of a bullet is it’s sectional density (SD) divided by its form factor. Compare a group of different caliber bullets that have the same shape and those with the highest sectional densities will have the highest BCs, i.e. the largest calibers. Using bullets of the same shape, any .277 caliber bullet would have a higher BC and a SD than its 6.5mm counterpart. It is the same with .257 caliber bullets compared to 6mm.

Consider the example of the Hornady 147 gr 6.5 ELD-match bullet given above. That bullet has an SD of 0.301. A 161.5 gr .277 gr bullet would achieve the same 0.301 SD and if made to the same shape as the 6.5 mm ELD bullet their BCs would be equal. On the other hand, it would be more comparable for Hornady to make something like a 168 gr .277" ELD and that would trump the BC of the 6.5.

But the market is what it is and bullet makers are not being called upon to make match bullets in diameters between 6mm and 6.5mm or between 6.5mm and 7mm.

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Subject	Posted by	Posted on
Behind-the-bullet- 6.5-284-Norma	Ripp	18/08/17 11:25 PM
Re: Behind-the-bullet- 6.5-284-Norma	DarylS	19/08/17 03:19 AM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	24/08/17 12:25 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	24/08/17 07:19 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	25/08/17 02:30 AM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	25/08/17 08:10 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	25/08/17 04:27 PM
Re: Behind-the-bullet- 6.5-284-Norma	Rule303	25/08/17 12:57 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	25/08/17 04:55 PM
Re: Behind-the-bullet- 6.5-284-Norma	Rule303	25/08/17 07:26 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	26/08/17 03:48 AM
Re: Behind-the-bullet- 6.5-284-Norma	Rule303	26/08/17 02:54 PM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	26/08/17 12:03 AM
Re: Behind-the-bullet- 6.5-284-Norma	Grenadier	26/08/17 03:09 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	26/08/17 03:55 AM
Re: Behind-the-bullet- 6.5-284-Norma	Grenadier	26/08/17 05:02 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	26/08/17 07:41 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	26/08/17 08:25 AM
Re: Behind-the-bullet- 6.5-284-Norma	Grenadier	26/08/17 09:04 AM
Re: Behind-the-bullet- 6.5-284-Norma	SharpsNitro	26/08/17 12:30 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	27/08/17 03:00 AM
Re: Behind-the-bullet- 6.5-284-Norma	Rule303	27/08/17 04:03 PM
Re: Behind-the-bullet- 6.5-284-Norma	HeymSR20	03/09/17 07:47 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	04/09/17 01:37 AM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	04/09/17 01:44 AM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	14/09/17 12:55 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	14/09/17 04:52 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	14/09/17 04:55 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	14/09/17 10:39 AM
Re: Behind-the-bullet- 6.5-284-Norma	VonGruff	14/09/17 10:55 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	14/09/17 01:33 PM
Re: Behind-the-bullet- 6.5-284-Norma	DarylS	14/09/17 03:35 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	15/09/17 09:07 AM
Re: Behind-the-bullet- 6.5-284-Norma	DarylS	15/09/17 09:21 AM
Re: Behind-the-bullet- 6.5-284-Norma	szihn	19/09/17 01:11 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	19/09/17 06:17 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	14/09/17 11:14 PM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	07/09/17 02:21 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	08/09/17 02:18 AM
Re: Behind-the-bullet- 6.5-284-Norma	DarylS	08/09/17 05:53 AM
Re: Behind-the-bullet- 6.5-284-Norma	Ripp	08/09/17 09:16 AM
Re: Behind-the-bullet- 6.5-284-Norma	DarylS	08/09/17 09:46 AM
Re: Behind-the-bullet- 6.5-284-Norma	Rell	08/09/17 10:03 AM
Re: Behind-the-bullet- 6.5-284-Norma	ducmarc	04/09/17 02:29 AM

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