AIA No.4 Mk. 4 - Rifling twist?

[PoFF]

I'm planning to switch to a heavier bullet for my match loads for my AIA No.4 Mk.4 (M10) .308WIN rifle.

However after hours (literally hours) of googling, I can't find the rifling twist rate of the barrel to know it it'll stabilize those heavy pills.

Anyone?

 

[Norton]

may see if this will work for you:
http://www.huntingblades.com/firitwra.html

[FONT=helvetica-bold.]Finding Rifling Twist Rate[/FONT]

Finding the rifling twist rate of a firearm is simple to do at home and can be done in a few minutes.

You really only need:a cleaning rod
yard or meter stick
brass jag
patches
permanent marker

Steps

1. Using your meter or yard stick as a straight edge, draw a line down the side of your cleaning rod.

2. Ensure the firearm is unloaded and with the brass jag and patch attached to the cleaning rod, place the rod 4-6 inches down the barrel.

3. Line up the mark you made on your cleaning rod with a mark on your barrel, it can be a scratch or nick, or the front site if your gun has one.

4. Place a mark on the cleaning rod at the point that it enters the barrel, you may use either the marker, or the tape. Tape is better, especially if you are going to be finding the rifling twist rate of more than one firearm.

5. Slowly push the cleaning rod into the barrel, allowing it to turn freely with the rifling. Stop when the line on the cleaning rod makes one full revolutions and returns to the mark you decided to use on the barrel (in step 3).

6. Place another piece of tape or mark on the cleaning rod at the point that it enters the barrel.

7. Remove the cleaning rod and measure the distance between the 2 marks. This is the rifling twist rate of your barrel.

 

[Blastattack]

Twist rate is 1:12"

 

[sunray]

Just use a 150 out to 300, a 168 to 600 and a 175 past there. All with IMR4064. However, an AIA is not a match grade rifle. No match grade barrel, trigger or sights. Both of the rifles Marstar was selling have the battle sight. Match grade bullets are wasted with 'em.
Don't use metrics with anything to do with firearms. Nearly everything we can get comes from the States and there ain't no metric system there. And that method is over complicated. No marks are required on the barrel.
Mark the handle end of your cleaning rod with a dot, put a lubed patch on your cleaning rod, stick it in the chamber until it stops with the handle end dot on top, mark the top of the rod at the chamber, push the patch thorough the barrel for one complete rotation of the handle dot and mark the rod near the chamber. The distance between the dots tells you the twist. One turn in whatever you measure. An AIA is most likely to be 1 in 10.

 

[Kayser Sose]

Mark the handle end of your cleaning rod with a dot, put a lubed patch on your cleaning rod, stick it in the chamber until it stops with the handle end dot on top, mark the top of the rod at the chamber, push the patch thorough the barrel for one complete rotation of the handle dot and mark the rod near the chamber. The distance between the dots tells you the twist. One turn in whatever you measure. An AIA is most likely to be 1 in 10.

I think this is effectively the same as the aforementioned method, just a bit tougher to comprehend. How its been written, you see.

Yeah, figuring the twist out using this method would likely be the fast track to your answer.