Discussion on Rifling

FNorm · 10-23-2011, 10:32 AM

Interesting, Rich.

But then lets look at wear. Pistol is short, and uses around 4-5 grs, power. Usual muzzle velocity is around 1200 +. I think it is hard to wear out a pistol barrel. Rifle while longer uses more power and is going 10X the speed of a pistol bullet.

Examples. I load 30.06 in the 2650 fps range, .308 in the 2550fps range. My 6.5 -284 is in the 3300fps range, and I expect to only get about 1200 rounds outta it. M1 Garand barrels are rated in the amount of throat erosion. A 1 is pretty new, a 5 is pretty shot out. About 1000 rnds per number.

FN

nukem556 · 10-23-2011, 10:56 AM

I'm also wondering if they were referring to the Enfield 2 groove barrel for the .005-.008 figure .....I've never slugged my 1943 Long Branch No.4 barrel, but from visual inspection it's easy to see the grooves are quite deep...perhaps for more "bite" given only 2 grooves?

Norm....what do you do with that 6.5-.284 hotrod? Do any NRA long range rifle matches?

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10-23-2011, 10:32 AM	#1
FNorm Patron LugerForum Patron Join Date: Mar 2009 Location: Colorado Posts: 978 Thanks: 68 Thanked 127 Times in 108 Posts	Interesting, Rich. But then lets look at wear. Pistol is short, and uses around 4-5 grs, power. Usual muzzle velocity is around 1200 +. I think it is hard to wear out a pistol barrel. Rifle while longer uses more power and is going 10X the speed of a pistol bullet. Examples. I load 30.06 in the 2650 fps range, .308 in the 2550fps range. My 6.5 -284 is in the 3300fps range, and I expect to only get about 1200 rounds outta it. M1 Garand barrels are rated in the amount of throat erosion. A 1 is pretty new, a 5 is pretty shot out. About 1000 rnds per number. FN

10-23-2011, 10:56 AM	#2
nukem556 User Join Date: Jul 2010 Location: Irmo, SC Posts: 625 Thanks: 35 Thanked 168 Times in 107 Posts	I'm also wondering if they were referring to the Enfield 2 groove barrel for the .005-.008 figure .....I've never slugged my 1943 Long Branch No.4 barrel, but from visual inspection it's easy to see the grooves are quite deep...perhaps for more "bite" given only 2 grooves? Norm....what do you do with that 6.5-.284 hotrod? Do any NRA long range rifle matches?