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Long Range Hunting & Shooting
Trigger magazine: 25 creedmoor - ultimate hybrid or ballistic bastard?
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<blockquote data-quote="MontanaRifleman" data-source="post: 1600073" data-attributes="member: 11717"><p>Actually, I hadn't heard of the Blackjack 131 gr 25 cal bullet when I made my post in this thread. It looks a good high BC bullet, That said, it is no .370 G7 BC bullet. IF you're referring to the 6.5 147 Hornady bullet, it is in no way a .351 G7 BC. Nosler and Hornady are notorious for exaggerating their BC's. That's the marketing game. </p><p></p><p>Maybe you know this and maybe you don't.. When a cartridge is necked down, there is a loss of efficiency, both in internal and external ballisitics. The smaller necked down case (25 Creed) cannot push the same weight bullet that the larger case (6.5 Creed) can push with the same amount powder/PSI at the same velocity... internal ballistics. When bullet caliber is increased, sectional density is increased with bullets of similar form factor, so.. larger cal bullets with same form factor as smaller cal bullets will have better BC's... external ballistics.</p><p></p><p>I.e. Bergers</p><p>7mm 184 F-open Hybrd, SD .326, G7 FF .937, G7 BC .356</p><p>.308 230 hybrid Target, SD .346, G7 FF .941, G7 BC .368</p><p></p><p>The 131 Blackjack puts the 25 Creed into the same ballpark as the 6.5 Creed but there is no way that it is a .370 G7 BC vs the Berger 6.5 140 Hybrid which is a .311 G7 BC</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 1600073, member: 11717"] Actually, I hadn't heard of the Blackjack 131 gr 25 cal bullet when I made my post in this thread. It looks a good high BC bullet, That said, it is no .370 G7 BC bullet. IF you're referring to the 6.5 147 Hornady bullet, it is in no way a .351 G7 BC. Nosler and Hornady are notorious for exaggerating their BC's. That's the marketing game. Maybe you know this and maybe you don't.. When a cartridge is necked down, there is a loss of efficiency, both in internal and external ballisitics. The smaller necked down case (25 Creed) cannot push the same weight bullet that the larger case (6.5 Creed) can push with the same amount powder/PSI at the same velocity... internal ballistics. When bullet caliber is increased, sectional density is increased with bullets of similar form factor, so.. larger cal bullets with same form factor as smaller cal bullets will have better BC's... external ballistics. I.e. Bergers 7mm 184 F-open Hybrd, SD .326, G7 FF .937, G7 BC .356 .308 230 hybrid Target, SD .346, G7 FF .941, G7 BC .368 The 131 Blackjack puts the 25 Creed into the same ballpark as the 6.5 Creed but there is no way that it is a .370 G7 BC vs the Berger 6.5 140 Hybrid which is a .311 G7 BC [/QUOTE]
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Trigger magazine: 25 creedmoor - ultimate hybrid or ballistic bastard?
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