20 PRACTICAL TWIST ?

[paw]

Which reamer.

 

[Edd]

Why all the 3G barrels? Are they better than 6 grooves?

 

[L.Sherm]

Why all the 3G barrels? Are they better than 6 grooves?

I think so

 

[Edd]

Who makes the 3G barrels?

 

[L.Sherm]

Who makes the 3G barrels?

Pac-nor snd Lilja come to mind

 

[Edd]

I was curious about their land and groove diameter but I didn't see it listed on their websites.

I have the parts to build a 20 caliber of some kind. My barrel is a 6 groove.

 

[JB10]

I dont have a 20 practical, but do have a 204r. Mine is a 12 twist. I have not gone over 35gr bergers. When its time to change it will stay the same or swap to an 11 twist. If i were you I'd decide what you really want to use and go for a good twist for that bullet. If looking for some speed 40s will slow you down a little bit. 32 varmageddons work great also.

 

[L.Sherm]

I was curious about their land and groove diameter but I didn't see it listed on their websites.

I have the parts to build a 20 caliber of some kind. My barrel is a 6 groove.

I wouldnt worry about the barrel you have, if I order one in a small cal a 3G is my preference
The difference between a 3G and 6G is the land width is gonna be double of the 6 groove

 

[searcher]

I use Hart 1-11's in three using those bullets

 

[long40shot]

No love for a 6 groove barrel?

 

[Coyotefurharvester]

Temperature is another factor in twist rate. When I run the Berger 40 BT in the Berger twist calculator, the 10 twist is fine to 20 degrees(at 3500 fps muzzle) drop to 0 degrees and the 10t enters into a marginal range. Temp is definitely a consideration for me, as the last few winters, I have had many nights of well below zero temps.

 

[TAJ45]

^^^^^^ Hmmm, interesting. I believe you but l won't be out at ZERO° F. to verify. Yah, Ima wuss.

 

[urbanrifleman]

My 20 Sploder 10 twist Wilson. Pics from my favorite 20 shooter.

 

[kaduflyer]

Mines a 1 in 9 twist excellent