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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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<blockquote data-quote="Bart B" data-source="post: 625727" data-attributes="member: 5302"><p>I've had some barrels and ammo tested at 1000 yards to check vertical shot stringing with a chronograph 10 feet in front. Even with a 25 to 30 fps spread, a third of the shots struck high for a low velocity and another third low for a high velocity. About a third struck even in elevation. Such is life when your barrel whips to enable positive compensation; slower bullets leave sooner, faster ones later in the upward whip of the bore at the muzzle. SMLE Enfield .303's are well known to do this with huge muzzle velocity spreads of their arsenal match grade ammo with even greater velocity spreads. Same ammo shot in rifles built on Mauser 98 front locking actions didn't compensate very much at the longer ranges but did better at short ranges compared to the SMLE.</p><p></p><p>Ballistic tables show 30 caliber magnums will have about 15 inches vertical shot stringing at 1000 yards with a 50 fps velocity spread. With a .308 Win., it's about 20 inches.</p></blockquote><p></p>
[QUOTE="Bart B, post: 625727, member: 5302"] I've had some barrels and ammo tested at 1000 yards to check vertical shot stringing with a chronograph 10 feet in front. Even with a 25 to 30 fps spread, a third of the shots struck high for a low velocity and another third low for a high velocity. About a third struck even in elevation. Such is life when your barrel whips to enable positive compensation; slower bullets leave sooner, faster ones later in the upward whip of the bore at the muzzle. SMLE Enfield .303's are well known to do this with huge muzzle velocity spreads of their arsenal match grade ammo with even greater velocity spreads. Same ammo shot in rifles built on Mauser 98 front locking actions didn't compensate very much at the longer ranges but did better at short ranges compared to the SMLE. Ballistic tables show 30 caliber magnums will have about 15 inches vertical shot stringing at 1000 yards with a 50 fps velocity spread. With a .308 Win., it's about 20 inches. [/QUOTE]
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Reloading
5 or 3 shot group when determining ES/SD???
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