.204 BT angle and length

If I have pushed the right buttons, and if you can get enough of an answer by scaling from a photo, here's the Berger 40 and also the BIB 40 in .204 dia.

Harold
 

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Thank you, guys. All I know now is the the axial length of the BT is 0.1" but I could roughly measure the angle at 9 degree. Just used a internet pic. This new pic will help me.
BTW, I will make the dies, so I just need to give the company that is EDMing the hole of the carbide insert the dimensions.
Thanks again.
Cheers
 
Tks again for all the info, guys.
George, if you're saying its not 15 degrees for the left one, its definitely not!!!! :eek: - Thanks

Harold, yes, I am having good experience with the vartarg. And being frank, the best thing is the wallet doesnt get damaged :cool:

Cheers
 
Response to Wilbur's request

Harold M said:
Best of luck with a BR VarTarg. I'm pleasantly surprised by what ours has done in competition.

Harold

Elaborate a bit if you will.
Click to expand...

Wilbur, I have shot the 20 VarTarg cartridge in an LV rifle at the Dunham's Bay matches for the past 3 seasons. Although I missed two matches this winter and one last year for personal/health reasons, I was nonetheless pleased with the results. Details can be seen on the IBS site. The gunsmith who built the rifle fired it at the Charity Classic and the IBS Nationals in 2014, with encouraging results. The exception was two matches fired with a bullet inappropriate for the twist of the rifle in the last two matches of the 2013 season.

The best way to evaluate any new concept is to enter into open competition against championship-quality shooters and equipment, so that's what we've done with the VarTarg.

From other sources: "This was the very first cartridge Todd A. Kindler ever designed. It was designed over two decades ago for precision varmint and target shooting. It has been very well received by the varmint shooting community and is now one of top selling wildcat cartridges on the planet. With less than 20 grains of powder varmint shooters can reach to 400 yards and beyond with very little recoil, barrel heat and less noise. The cartridge is made from 221 Fireball brass. We now have precision 221 Fireball brass from Lapua and Norma. In fact Lapua even mentioned the 20 VarTarg in their introductory 221 Fireball ad. If you’re looking for a very small and efficient cartridge that has ballistics very similar to the 223 or PPC’s but uses much less powder then this may be your choice. Less expensive powder equals less recoil, less noise and less rifle disturbance is what makes this 20 VarTarg loved by so many! Todd Kindler is the owner of The Woodchuck Den Inc. and has a great twenty caliber 4th Edition manual called The Terrific Twenties and has all the dies and knowledge to help anyone get their 20 VarTarg going!"



Thank you for asking. If additional information would be helpful, I will be happy to supply same by posting or private communication.


Harold
 
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Just for curiosity, 20VT at 100 m doing some test loads. ADI reformed brass and 32gr Z-Max, 18gr of 2207 and .001" neck tension. Just cant remember how much the bullet was off the lands. All 5 shot groups. Cheers

marcos_godoy_20_VT.jpg
 
My experinece

The barrel on the BR rifle is a Hart one in twelve. The best bullet so far has been the Berger 40. It is seated with a healthy jump. Care must be taken to not press a ring into the bullet as it is seated. I use a Wilson seater, but dust the ID of the case necks with graphite. The chamber is standard. Necks of the Lapua cases made from .222 brass are 0.013 and I use a 0.228 bushing in a Redding "S" FL die.

Again, best of luck and let me know how you are progressing.

Harold
 
data on bullet

The bullet in the link is a Berger Bullet 20cal. 40 grain varmint bullet. It has a 7 degree BT with a length of .100 and the over all length (estimate) is .675
 
David Hamilton said:
The bullet in the link is a Berger Bullet 20cal. 40 grain varmint bullet. It has a 7 degree BT with a length of .100 and the over all length (estimate) is .675
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well .100 is correct , not so sure about the 7* though. if you are referencing the quick reference sheet you do realize the ogive is not the b.t. angle ..I wouls say closer to 10* area, but I have not checked as for bib's those I know but if Randy wants it known he will join in...
 
bt

The BT angle is a 9 degree not a 7 degree. We will be going to the 7 degree on our next seater die. I forgot we have not made the change.
 
David Hamilton said:
The BT angle is a 9 degree not a 7 degree. We will be going to the 7 degree on our next seater die. I forgot we have not made the change.
Click to expand...

I HOPE you aren't saying the Berger 40 is changing. Say it isn't so. If it is, I need to buy a few thousand of the current configuration.

Harold M.
 
We are going to change the BT degree from a 9 to a 7. The change is moving forward but the die will not be ready until next year.
 
I grabbed three bullets from a box, OA length for them is 17.15mm, 17.18mm and 17.25mm. The angle that I measured is 19* included angle. At 18* and 20* I thought I could see light on the edges of the protractor (sorry, I don't have an optical comparator), so if David says 18* IA he ought to know, but I was was darn close anyway:eek:.
 
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