Let's talk about 2 mile cartridges

[hubel458]

I was thinking of 550 gr 416 bore rider drilled out enough

to be about 470-500 gr in our 416 HSM ,which can get that

faster than others can get 380-400 gr.Ed

 

[Milepost]

Hi,

The "novel" idea is already in production for various calibers.
David Tubb and others have been testing some 338 and 6.5 projectiles designed by Jim Boatright with the bases drilled out. He also already has the projectile design with bases drilled for the 375, 408, 416 and 510 but that design is purely a "gap fill" for people not wanting to rebarrel their rifle with the 6 and 7 twist needed to achieve hyper-stabilization with non based drilled solids.
The concept really comes to life with Jims research paper on Hyper-stabilization of Projectiles and the Coning Theory of Rifle Projectiles.

Sincerely,
Theis

But if you drill out the bullet aren't you effectively changing its SD and thus actually lowering the BC of the bullet?

Yes, the C.D.( coefficient of drag ) will stay the same but the mass of the bullet is deceased and thus so is the kinetic energy. So, although the bullet would exit the barrel faster it would slow down quicker too.

Also, the reduction in mass would slightly decrease the gyroscopic effect to some degree.

 

[Cote0321]

I thought if it said Cheytac it could go as far as it wants to accurately. no? haha

 

[hubel458]

Make bullet longer with hollow base, which is why we said
make it 470-500 gr as the desired weight we want, but start with 550 and drill base, then being nose heavier a slower twist will work.Barrels easier to get.Ed

 

[hubel458]

About 416 cal bullets............

The heaviest 550 gr for Extreme ELR probably be best 8 to 1 twist , in 416 caliber bullet,
and 520 gr 9.5 to 1, and 470gr 10 to one, Some barrels I picked up are 10 to 1.......

Now a novel idea is to lighten rear of bullet with small shallow hole drilled in base, might do better
long range.which would allow 10 to one barrel stabilize the heavier 550 gr bullets for ELR.
Making bullet nose heavier makes it more stable in flight, needing less spin,
like our hollow base 585 cal minie bullets only need 48 to 1 twist, or less
while out regular 585 bullets need about 24 to 1 to stabilise them..............

The winner of the King Of 2 Mile shoot last week was using 416 Barrett with a 1 to 10
twist, with a 500 gr CEB Lazer bullet, ...Robert Brantley, with Manners Stocks....

Paul Philips was third with a 416...

GOOD NEWS-- There is now an importer and seller of our 585 HE brass getting set up here,
in US, hopefully will be in stock, few weeks........ http://bertrambrass.com .. .. Caleb Hallet..

Have got another intermediate size action besides the Montana PH our guys working on,
to do speed testingwith. It is big long REM style action that can take our 416 HSM, ED

 

[hubel458]

Experimental intermediate size action with the Montana PH, for comparison.

It is an experimental action for our 416 HSM, to do our speed testing with

and get a better action than Cheytac size actions, for bigger case ELR use,

without going all way up to more expensive, huge actions.

It is big long round style action that can take our 416 HSM, almost

1.6" diameter and .800" bolt, with locking lugs nearly as big as most BMG actions.... ED

 

[Deleted member 71114]

Nice looking action, good luck with the project Ed

Oneshot
JH

 

[hubel458]

Here is picture of the bolt from the experimental action,

with our 416 HSM case in it. Note the amount of the

base size of locking lugs, the amount of area on the bolt...ED

 

[hubel458]

Spearpoint ELR Roundup
Ride the wind in Kansas
August 11 & 12, 2018

ELR match will be held at Spearpoint Ranch near Lincoln, Ks.
Spearpoint $1000 Three Shot Challenge will be held Saturday Morning.

ELR match will have 7 steel targets from 1500 yds out to 2900 yds.
Competitors will fire 4 rounds at each target on each day for a total of 56 rounds.
Scoring will emphasize first round hits with declining point values per attempt.

Calibers up to and including .50 BMG welcome.
All shooting will be from a prone position.

Cost is $80 per shooter.
An additional $20 for those wishing to try the Spearpoint Challenge

 

[Hatrick]

Spearpoint ELR Roundup
Ride the wind in Kansas
August 11 & 12, 2018

ELR match will be held at Spearpoint Ranch near Lincoln, Ks.
Spearpoint $1000 Three Shot Challenge will be held Saturday Morning.

ELR match will have 7 steel targets from 1500 yds out to 2900 yds.
Competitors will fire 4 rounds at each target on each day for a total of 56 rounds.
Scoring will emphasize first round hits with declining point values per attempt.

Calibers up to and including .50 BMG welcome.
All shooting will be from a prone position.

Cost is $80 per shooter.
An additional $20 for those wishing to try the Spearpoint Challenge

Are these matchs spectator friendly? ( a place to stay out of the way but still see shooters and targets)

 

[hubel458]

Check with them, I just posted what I saw,

never been there, Ed

 

[Deleted member 71114]

If I were you I would go to Spear Point and watch, you will be able to visit with folks and in one way or another find a place to stand a watch.

Osoh
JH

 

[hubel458]

Here is link to guy doing special 585 HE in the EU, Good pictures., Ed,...........www.585he.cz

 

[hubel458]

We tested intermediate action with a 700HE barrel we had here.

Just temporary to test strength. 1000 gr over 3100..

Action worked fine.. Ed.