20 caliber Cartridges

[Wirelessguy2005]

Ken,

The 20 SCC is based on the 221 Fireball that is necked down to 20 caliber with the case walls straightened and a 40 degree shoulder added. Over the last year i have had three rifles chambered in 20 SCC and they all perform very well. Its very common place to see 4,000 + fps with a 32 grain bullet and 21 grains of powder. In addition to the obvious performance gain you also have less recoil and noise than a 204 or 20 Tac while still maintaining the same speeds. Brass trimming is also minimalized due to the 40 degree sholulder. All in all its an excellent high volume varmint cartridge for Pdogs or ground squirrels and would also perform well for target shooting. There is plenty of additional information for the cartridge located on the smallcaliberclub.com forum.

Below is a picture of a 5 shot fireform group i shot this spring.

another picture of a 5 shot group with formed brass, the 5th round flier was my fault

 

[Kenster]

Thanks 2005, if you have any vv-n133 could you check and see how much of it will fit in your 20 scc when filled about to the top of the shoulder neck donut area....and what are the bullets and powders you have had the most cinsistent accuracy with in your 20 scc...and what barrel manufacturer and barrel lengths are you using?....primers? thanks again, ken

 

[Wirelessguy2005]

Unfortunately i don't have any N133 so i can't answer your question on that one. The go to powder for velocity and top accuracy in the 20 SCC is Accurate 2200. I have tried many different bullet combo's including many of the 32 grain bullets as well as the 39 sierra and all have produced very good accuracy. The 20 SCC isn't picky and seems to offer very good accuracy with almost any bullet combo when using Accurate 2200 powder. Currently I have a 25" Pacnor 3 groove 11" twist and a 24" CZ factory barrel.

 

[SKI RIFLES]

It`s a .20-221 AI or .20Vartarg AI...

Yes, and as WG05 has pointed out the case wall has been straightened. Its not really a new cartridge, other shooters have done it on other forums. I had a few contact me about the 20/221 FB Ackley. Its also been done in a .17 cal. a few yrs back. I have 2 different reamers for the .20 and Im thinking about doing the .17 as well. Ken, I will ask a customer if he can let me know about n133 and capacity for you.........SKI

 

[anrew]

I have 2 204 AI one gun has a pac-nor 1-8 twist shoot the 55 berger. 1.250 strait barrel nightforce scope with a velocity 1000 reticle. So far 847 yards p-dog kill this year. Bullet going 3400 fps. The other gun has a shilen 1.250 strait barrel 1-12 twist with a nightforce velocity 1000 reticle. I shoot the 39 blitz king going 3950 fps. That gun has a p-dog kill at 720 yards. Both guns weight is 22 pounds. 5 shoot groups at 200 yards are .180 to .270

 

[bowfisher]

Just so folks know, the 20SCC and the 20/221 AI, while very close in dimensions, are not exactly the same and dies may not be interchangeable. Due diligence is required before settling on a specific chambering.

 

[Robert Brown]

Spook,
what barrel, and what twist mate?
Regards,
Robert

 

[lpreddick]

i shoot paper and varmints...esp ghogs(104 this year). i'v burned a 22-250 and a 22 BRX before i knew it. shot a 6x45 this year and am developing a taste for guns that don't burn so much powder and barrel, so i looked at the .20 cal. ok, i'm on board! i have a .20 tac being built and am accumulating the brass, bullets, dies, etc. it willl be a switch barrel gun using a stiller predator v lprb, jewell, sightrom 8-32 in a shurley laminate. i'm collecting load data in the meantime and was wondernig if there is a site like i found for the 6x45 (predator masters forum...hundreds of bullet/powder combos in a single chart). i have plenty of n133 as my 6x45 loves it. also have a lot of LT 32 and suspect it should do well in the .20 tac. thanks for any advice. oh yea, i ordered todd kindler's book on the .20 cal.

 

[hogpatrol]

i shoot paper and varmints...esp ghogs(104 this year). i'v burned a 22-250 and a 22 BRX before i knew it. shot a 6x45 this year and am developing a taste for guns that don't burn so much powder and barrel, so i looked at the .20 cal. ok, i'm on board! i have a .20 tac being built and am accumulating the brass, bullets, dies, etc. it willl be a switch barrel gun using a stiller predator v lprb, jewell, sightrom 8-32 in a shurley laminate. i'm collecting load data in the meantime and was wondernig if there is a site like i found for the 6x45 (predator masters forum...hundreds of bullet/powder combos in a single chart). i have plenty of n133 as my 6x45 loves it. also have a lot of LT 32 and suspect it should do well in the .20 tac. thanks for any advice. oh yea, i ordered todd kindler's book on the .20 cal.

smallcaliberclub.com and saubier.com Plenty of info on the .17s and .20s.

Like Bowfisher says, N133 works wonders in the .20 Practicals, 1-10s & 1-11s

 

[bowfisher]

Quite a few guys shoot N133 in 20 Practs and 20 Tacs.

 

[lpreddick]

Shot my 20 TAC yesterday and it was FUN! Bore sighted at 50 yds with 32 vmaxs and LT 32...one shot on paper. Went to the 100yd target and shot 3 (rounds 2,3, and 4 out the barrel). Looked to be sure...a .151 inch little hole! The group opened with increased powder. The MV was only 3800, so I've got room for more LT32. N133 and rel 10x with 32s and 40 bergers shot 5/16 to 3/8 in groups...got some work here. Got h4198 today so it's to the reloading bench. My bullet seating depths may be erratic as the Sinclair bullet insert for the hornady comparator was oversized...a 20 cal bullet went INTO the insert. A replacement is on the way.