Why the big 20s?

[urbanrifleman]

0 FB - pretty much the same as my Manson reamer.

I can't imagine needing any freebore with a 270 thou long neck.

 

[Tommie]

I can't imagine needing any freebore with a 270 thou long neck.

Agreed. Bearing surface is .235” on the Berger. Freebore will occur naturally over time.

 

[Lefty2506]

I have 2500 of them on hand, bought them when they were being discontinued knowing I’d build a fast 20 at some point. Didn’t know Grafs has them, I’ll probably buy a few more. Thank you

That should be enough to get you through the first 2 barrels...

 

[Woollybugger]

I can't imagine needing any freebore with a 270 thou long neck.

Will see, Jammed with 55 bergers is just above the shoulder neck junction. If they like a .010 jump I might want to throat a bit. Won’t know where the donut is until this brass has been fully fire formed. All that neck is more useful if half empty.

 

[nakneker]

That should be enough to get you through the first 2 barrels...

Hopefully!

 

[Gabe22BR]

Hopefully!

Who’s barrels ya gonna use??….
I forgot to ask Zach last night…

 

[nakneker]

Who’s barrels ya gonna use??….
I forgot to ask Zach last night…

Not sure, I’ll probably try and land a Mueller. Not sure sure if Zack has any on hand, i need to get the details on that build worked out. It’ll be a priority after the New Year. What barrels have you been using for fast 20 cals?

 

[Gabe22BR]

Plinking=
Pacnor, Douglas, hart, shilen , etc….

Competition =
Kreiger, Bartlien, Mullerworks, benchmark…

Yet to try a Lija…..

I have 2 Preferred Barrels on my varmint rifles…

 

[L.Sherm]

The ogive is whats gonna contact the lands first isn't it, so if you take Bergers bullet dimensions its base to ogive is .449 take off .100 for boatail that leaves you .349 from junction to ogive.
On your print it says .016 from the neck to the lead, just crunching numbers don't know if its correct.

 

[Tommie]

This might help

Technical Notes​

• Caliber: 20 Caliber
• Bullet Weight: 55 Grain
• Product Line: Varmint
• G1 BC: 0.354
• G7 BC: 0.182
• G7 Form Factor: 1.037
• Minimum Twist (or faster): 1:8"
• Ogive Style: Tangent
• Base Style: Boat Tail
• Jacket: J4 Varmint Jacket
• Sectional Density: 0.189
• Bullet Dia.: 0.204
• OAL: 0.908
• Base to Ogive: 0.449
• Nose Length: 0.573
• Bearing Surface: 0.235
• Boat Tail Length: 0.1

 

[Gabe22BR]

This might help

Technical Notes​

• Caliber: 20 Caliber
• Bullet Weight: 55 Grain
• Product Line: Varmint
• G1 BC: 0.354
• G7 BC: 0.182
• G7 Form Factor: 1.037
• Minimum Twist (or faster): 1:8"
• Ogive Style: Tangent
• Base Style: Boat Tail
• Jacket: J4 Varmint Jacket
• Sectional Density: 0.189
• Bullet Dia.: 0.204
• OAL: 0.908
• Base to Ogive: 0.449
• Nose Length: 0.573
• Bearing Surface: 0.235
• Boat Tail Length: 0.1

Depending on lot #

I got some in the old (1999-2001) yellow box measure different than current ones, the orange box measure different than current yellow box….

It’s a good reference ….

 

[Gabe22BR]

Not sure, I’ll probably try and land a Mueller. Not sure sure if Zack has any on hand, i need to get the details on that build worked out. It’ll be a priority after the New Year. What barrels have you been using for fast 20 cals?

We get this done yet ??

 

[nakneker]

We get this done yet ??

No, reamer is in but I have 6 rifles in the queue ahead of it. Probably fall or winter I would guess. I’ll be sure to share it when I get it in my hands. Thanks for asking.

 

[Bugger Picker1]

I'm curious why people are doing the bigger 20cal wildcats. Not trying to pick a fight. I'm just generally curious on what the appeal is. I understand the benefits of some of the smaller cartridges like the 20 vartag and 20 practical, but I'm struggling to understand the appeal of the bigger cases like the 20ppc, 20BR, and even the 20-250 in comparison with their 22 cal counterparts.

Just curious
Mark

Well Lefty, Good point. If it wasn't for experimenters where would this sport br ? still muzzle loading?
Seriously, I think back about how I got started in this money dump. I read an article about PD shooting. I was always buying a new deer riffle every year or so. first was a 2506 because my neighbor had one back in 1980. My first was a factory Remington Varmint 2506. Never should have sold that one. First PD trip we did not find many PD's but I liked the idea. Deer hunting was great but, not much shooting. First PD trip I had a ruger VT 22-250 and a Rem 243 Varmint. Then mine is bigger than yours took over. Rotating shooting tables. 6-284 heavy bench rifle. 22-250AI very heavy Bench rifle. 222 for the close ones. 6BR & 223 window rifles. I finally got tired of replacing barrels and fire forming cases. 6MMRen AI 243W AI. Ok, I got old, retired, fixed income. Current Varmint arsenal the big rifle 20-223 from there 20VT 17 Ackley Hornet. Next two 20 Dasher to use up my 1,100 55 Bergers, 17 Squirrel. I am able to justify the smaller calibers because of the powder, bullet, barrel, right? Ok I lie! I like messing with new stuff. I did need to get away from the big boomers. I read an article on a water-cooled barrel using tension nuts. A quote from my smith " You need a larger cooling tank and an action that is belt fed! End result, somebody is always going to have something bigger than yours! The PPC will be dethroned one day! I just it comes from an American round.

 

[Bugger Picker1]

They are lasers and fur friendly but completely impractical to me. I don’t care anything about a rifle that won’t shoot .250 with regularity, and with 500 rounds of barrel life on a giant 20, regular is out of the question. I can see myself chasing seating depth into the abyss.

For what it is worth, I built a bench rifle with a no taper barrel and was able to set it back twice.

 

[Bugger Picker1]

If you ask why my immediate thought is “why not” - granted the big overbore 20 cals aren’t practical in any sense of the word but they are fun and very impressive as far as fast and impacts. When you get into anything overbore, no matter the caliber, practical or ”makes sense” goes out the window imo. Your just venturing in the land of the unpractical.

I’m currently having a 20GT reamer being made at JGS, Im building it just to shoot a pile of 55 grain bergers I have. I think it’ll be fun and don’t mind the impractical side of overbore cartridges. I think it’s fun, to each their own….

I just took delivery of 22-6.5 PRC this summer. I’ve only taken it out a couple times but the two coyotes it dispatched were memorable impacts, talk about a thump! 70 grain accubond at 3625 fps is stout medicine.

I am not a Yote hunter but. air PD's, Helicopters, doubles, triples need velocity.

 

[Lefty2506]

The PPC will be dethroned one day! I just it comes from an American round.

Between the 6BR (Remington) and 6.8 SPC it seems like the potential is there. Unfortunately everyone is more focused on the ARC cartridges instead. Not a lot of factory offerings out chambered in a BR variant, and I'm not sure I've ever actually seen 6BR factory ammo in person.

 

[Gabe22BR]

Left-6BRAI - 20BRAI- 20-221AI -

 

[nakneker]

Left-6BRAI - 20BRAI- 20-221AI -View attachment 1635290

Beautiful!

I do have a 20-222, gonna rebarrel a Ruger #3 to 20-222 next year too, very enjoyable cartridge.