What twist for a 20-221FB or Variant of???

[B23]

Probably should have asked this before I ordered a Hart 1-11tw barrel but I'm having a .20 built and will be doing either a straight 20-221FB or 20 VarTarg. I already ordered a 1-11tw barrel from Hart but now I'm sorta second guessing myself and wondering if I should have went with a 1-12tw or maybe even the other direction and gone with a 1-10tw.

My plan is to shoot the 32's and maybe some Berger 35's. My thought process was to get the 1-11tw so I could shoot the 39's or 40's if I wanted to give them a go but likely all this will see is 32's.

 

[Gabe22BR]

Your good with the 11 twist-32gr bullets

 

[22DASHER]

Stick with the 11 twist.

 

[HillbillyLongRifle]

Every one worries about 12 twist barrels in 20 caliber! If its a true 12 twist it will shoot well with 32-40 grain bullets. When in doubt get the 11 twist. I always liked 12 twist the best for my 20 Vartarg and 20 TAC rifles.

 

[DogBuster]

I've been shooting a 20 VT going on 12 yrs now.....

12 twist 3 groove Pac Nor.....awesome cartridge....quiet fast & flat

40 V max main diet......some 32's on occasion....never an issue with 40's

your 11 twist will be fine.....get some H322 & call it good......also have......

a 9 twist 20-222......the reason being it started life as a 20 BR......for 1200 rds...

this is my favorite 20 cal of the three 20's I shoot.....

 

[Rick in Oregon]

My five .20 cal rifles all wear 12T barrels, with the exception of one that's an 11T....THAT rifle is dedicated to the 39/40's and does it quite well.

Stick with your 11T and you'll never look back.

 

[B23]

I haven't completely decided yet but I'm leaning toward just a straight 20-221 Fireball with a finished length of 24 inches. I don't see much need to go any longer than 24 and I'm only using a #4 contour with this build so I'm thinking 22-24 most likely 24.

 

[steve123]

Probably should have asked this before I ordered a Hart 1-11tw barrel but I'm having a .20 built and will be doing either a straight 20-221FB or 20 VarTarg. I already ordered a 1-11tw barrel from Hart but now I'm sorta second guessing myself and wondering if I should have went with a 1-12tw or maybe even the other direction and gone with a 1-10tw.

My plan is to shoot the 32's and maybe some Berger 35's. My thought process was to get the 1-11tw so I could shoot the 39's or 40's if I wanted to give them a go but likely all this will see is 32's.

What if you want to try the Berger 55's???, I wish I could but I have a 11 and a 12 twist. I will probably never wear these barrels out but if I did I'm going for a 9 twist.

 

[B23]

What if you want to try the Berger 55's???, I wish I could but I have a 11 and a 12 twist. I will probably never wear these barrels out but if I did I'm going for a 9 twist.

I have this 20-250 with a 1-8tw Krieger that shoots those 55 Bergers into tiny little goups.

 

[steve123]

I have this 20-250 with a 1-8tw Krieger that shoots those 55 Bergers into tiny little goups. View attachment 1046364

I have a 20x47l that doesn't shoot 55's into tiny groups anymore - after about 300 down the barrel.

I hope your barrel lasts longer....

 

[B23]

I have a 20x47l that doesn't shoot 55's into tiny groups anymore - after about 300 down the barrel.

I hope your barrel lasts longer....

OUCH! I know these hot rod overbore .20 cals weren't long for barrel life but I'm hoping for 500-600 rounds of life. BUT, I did order two 1-8tw barrels from Krieger when I started this project so I have a spare sitting on the shelf ready to go when this one craps out.

I was originally thinking of doing a 17 Mach IV or 17-222 but I think the .20 cals off of the 221FB is just a better all around cartridge for what I want.

 

[steve123]

OUCH! I know these hot rod overbore .20 cals weren't long for barrel life but I'm hoping for 500-600 rounds of life. BUT, I did order two 1-8tw barrels from Krieger when I started this project so I have a spare sitting on the shelf ready to go when this one craps out.

I was originally thinking of doing a 17 Mach IV or 17-222 but I think the .20 cals off of the 221FB is just a better all around cartridge for what I want.

That was a smart idea getting two barrels.

At 3830 fps, square in the high node, I tried slowing the load down to 3600 but the bullets were still coming apart so I had to start over.....

The barrel I mentioned shoots 40vmax well with a light load at 4100 fps so my project wasn't a total flop at least.

Still got 4 boxes of the 55's waiting around.

My 5mmFBI, which is similar to 20VTAI, wasn't feeding well out of the mag in my CZ527 so I removed 50 thou off the front of the mag lips. That and buying a new extractor made the feeding, extraction, and ejection really good now!!!

Aren't you guys glad I'm dulling out free info, lol.

 

[TAJ45]

I have a 20x47l that doesn't shoot 55's into tiny groups anymore - after about 300 down the barrel.

I hope your barrel lasts longer....

Who's bbl?

 

[steve123]

Who's bbl?

Krieger