Barrel Twist (Argie vs Enfield)

GS455 · December 18, 2011, 23:13

I just happened to take a look at the barrel in my Brit L1A1 and hold it up side by side with the barrel I got with my Argie kit from Sarco. Definitely a lot more twists/lands in the Brit barrel.

I'd be interested to know what the land/twists count are and the story behind the difference.

**def90** · December 18, 2011, 23:33

The Brits and Aussies played with twist rates as well as number of lands and grooves over the years.. I believe they started out with 6 lands/grooves early on and went to 4.. Twist rates I am not sure of. Also the early 6 groove barrels in Australia were broach rifled and late on in production they switched to hammer forged barrels with 4 grooves.

GS455 · December 19, 2011, 00:08

Does either speak to accuracy or desirability?

mmcalc · December 19, 2011, 02:01

The standard twist rate for 7.62mm is 1 in 12 inches. I would bet they are all pretty close to that. The number of grooves is independent of the twist.

**MAINER** · December 19, 2011, 08:39

Quote:

Originally posted by GS455
Does either speak to accuracy or desirability?

Yes, the Brit barrels produced by Parker Hale, PH, are highly prized for accuracy. I don't know what twist or method was used to make them, but believe they were Hammer-forged.

Zeusizme · December 19, 2011, 09:55

Quick way to check your twist rate is to use a cleaning rod and some tape. Put a patch on the end of the rod and seat it in the rifling. Then fold a piece of tape around the rod just touching the end of the barrel, and note its position in relation to the barrel. Now pull the rod slowly until the tape is back to the same oreintation. Then just measure from the muzzle to the tape and you have your quick and dirty twist rate.

December 18, 2011, 23:13	#1
GS455 Registered Bronze Contributor FALaholic #: 63848 Join Date: Jul 2011 Location: Nashville, TN Posts: 228	Barrel Twist (Argie vs Enfield) I just happened to take a look at the barrel in my Brit L1A1 and hold it up side by side with the barrel I got with my Argie kit from Sarco. Definitely a lot more twists/lands in the Brit barrel. I'd be interested to know what the land/twists count are and the story behind the difference.

December 18, 2011, 23:33	#2
def90 Old Fart Silver Contributor FALaholic #: 50609 Join Date: Nov 2009 Location: The Peoples' Republic of Boulder, Colorado Posts: 8,863	The Brits and Aussies played with twist rates as well as number of lands and grooves over the years.. I believe they started out with 6 lands/grooves early on and went to 4.. Twist rates I am not sure of. Also the early 6 groove barrels in Australia were broach rifled and late on in production they switched to hammer forged barrels with 4 grooves. __________________ There is no theory of evolution, just a list of creatures Chuck Norris allows to live. Public libraries cannot let the public decide what is allowed in the library, or it would be brimming with pornography and gun magazines.

December 19, 2011, 09:55	#6
Zeusizme Registered FALaholic #: 64239 Join Date: Sep 2011 Location: PA Posts: 959	Quick way to check your twist rate is to use a cleaning rod and some tape. Put a patch on the end of the rod and seat it in the rifling. Then fold a piece of tape around the rod just touching the end of the barrel, and note its position in relation to the barrel. Now pull the rod slowly until the tape is back to the same oreintation. Then just measure from the muzzle to the tape and you have your quick and dirty twist rate. __________________ Shoot it until it smokes!

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December 19, 2011, 00:08	#3
GS455 Registered Bronze Contributor FALaholic #: 63848 Join Date: Jul 2011 Location: Nashville, TN Posts: 228	Does either speak to accuracy or desirability?

December 19, 2011, 02:01	#4
mmcalc Registered FALaholic #: 37332 Join Date: Aug 2008 Location: Virginia Posts: 160	The standard twist rate for 7.62mm is 1 in 12 inches. I would bet they are all pretty close to that. The number of grooves is independent of the twist.