http://www.shootingtimes.com/ammo/starlines-6-5-creedmoor-brass/
“...but the small primers almost always delivered reduced standard deviations and improved accuracy. I consulted Dave Emary, Hornady’s chief ballistician and originator of the 6.5 Creedmoor, to share the good news.
He promptly poured cold water on my results.”
“Typical 6.5 Creedmoor powder charges are simply too large to reliably ignite with Small Rifle primers under all conditions. They’re just fine for .223 and similar capacity rounds; however, we’re talking about nearly twice as much propellant. A Large Rifle primer is definitely needed to assure reliable and consistent ignition. If the throat is eroded and a round hang-fires, the bullet will plug the bore, and the reigniting propellant will likely fully burn before the bullet can began moving again. Skyrocketing pressures may damage the rifle and possibly injure the shooter.”
“Ron Reiber, Hodgdon Powder product manager, added even more cold water.”
“Many propellants are sensitive to temperature variations,” Reiber said. “If the ammo gets too cold, it’s harder to ignite. Small primers contain less energetic material, so the risk of experiencing a dud round or hang-fire increases in cold conditions. And the 6.5 Creedmoor can achieve excellent ballistic performance loaded with a double-base propellant containing nitroglycerine. That type of propellant is more difficult to ignite than single-base, nitrocellulose powder, which only exacerbates the critical ignition process.”
H4350 is a single-base propellant and it’s what I use, but could certain conditions also make this a dangerous combination? I’m worried because this article is the first time I’ve heard of any of this. New to Creedmor, and I’ve never fired my rifle in colder temps yet.
“...but the small primers almost always delivered reduced standard deviations and improved accuracy. I consulted Dave Emary, Hornady’s chief ballistician and originator of the 6.5 Creedmoor, to share the good news.
He promptly poured cold water on my results.”
“Typical 6.5 Creedmoor powder charges are simply too large to reliably ignite with Small Rifle primers under all conditions. They’re just fine for .223 and similar capacity rounds; however, we’re talking about nearly twice as much propellant. A Large Rifle primer is definitely needed to assure reliable and consistent ignition. If the throat is eroded and a round hang-fires, the bullet will plug the bore, and the reigniting propellant will likely fully burn before the bullet can began moving again. Skyrocketing pressures may damage the rifle and possibly injure the shooter.”
“Ron Reiber, Hodgdon Powder product manager, added even more cold water.”
“Many propellants are sensitive to temperature variations,” Reiber said. “If the ammo gets too cold, it’s harder to ignite. Small primers contain less energetic material, so the risk of experiencing a dud round or hang-fire increases in cold conditions. And the 6.5 Creedmoor can achieve excellent ballistic performance loaded with a double-base propellant containing nitroglycerine. That type of propellant is more difficult to ignite than single-base, nitrocellulose powder, which only exacerbates the critical ignition process.”
H4350 is a single-base propellant and it’s what I use, but could certain conditions also make this a dangerous combination? I’m worried because this article is the first time I’ve heard of any of this. New to Creedmor, and I’ve never fired my rifle in colder temps yet.
