Help

[kenbro]

Can anyone with the right equipment tell me if, an 18 inch barrel will burn all of 17.5 grains of Vhit N120 and also (But not at the same time) 14.7 grains of Lil’gun.
This is using 52 grain Berger Varmint bullets in a 221 Rem. Fireball.
Thanking you, Ken.

 

[fizzbangwhallop]

Stick it in P-MAX Ken… iirc that tells you what you want to know…

External Ballistics form

Ballistics Programs

www.geoffrey-kolbe.com

Cheers

Fizz

 

[kenbro]

Stick it in P-MAX Ken… iirc that tells you what you want to know…

External Ballistics form

Ballistics Programs

www.geoffrey-kolbe.com

Cheers

Fizz

Hi, unfortunately they don’t list Lil’gun but one powder i tried (Because I had some) showed I was 18500 ft lbs over safe limit.
Considering everything, I don’t agree with that figure.
Cheers, Ken.

 

[Smellydog]

If it doesn't burn it all Ken I don't think you'll be able use it again anyways.

 

[kenbro]

Hi, unfortunately they don’t list Lil’gun but one powder i tried (Because I had some) showed I was 18500 ft lbs over safe limit.
Considering everything, I don’t agree with that figure.
Cheers, Ken.

Shoulda said 18500 PSI over pressure.
Kb.

 

[kenbro]

If it doesn't burn it all Ken I don't think you'll be able use it again anyways.

Why not?

 

[billgatese30]

Waaay over pressure with N120. Lilgun is overpressure too at 14.5gr but not by as much, and its all burnt by about 7 inches or thereabouts.

 

[fizzbangwhallop]

Hi, unfortunately they don’t list Lil’gun but one powder i tried (Because I had some) showed I was 18500 ft lbs over safe limit.
Considering everything, I don’t agree with that figure.
Cheers, Ken.

What data did you use to get that?

221 Remington Fireball Load Data

Explore the world of Nosler, renowned for crafting the finest bullets, ammunition, rifles, and brass. Discover our extensive lineup, including Partition, AccuBond, E-Tip, Ballistic Tip, Custom Competition, and more. Experience superior quality and performance with Nosler products.

www.nosler.com

From the cartridge data in the Nosler online manual:
.224 cal;
case capacity 19.9grn h2o
Case length 1.4”
and using your 17.5grns of N120, 18”, 52grn pill I got the following…

Nb it doesn’t show my input variables… but the pressure of 62117 came up in Amber rather than Red ….looks like N120 is too quick for it…

The BBT "P-Max" internal ballistics simulator

DECLARED INPUT DATA​ The powder used was N120 by Vihtavuori To change the powder, check this box and click re-submit​ Powder space:​ cc grains of water Powder weight:​ grams grains Bullet weight:​ grams grains Bullet type:​ Copper jacketed, lead core ( moly'd) Lead Bore rider with drive band Monolithic solid Calibre:​ 17 20 224 243 (6mm) 25 (250) 264 (6.5mm) 270 284 (7mm) 7.5mm 308 (7.62mm) 303 32 8mm 338 38 (9mm) 375 40 (10mm) 416 44 45 (450) 475 50 577 Barrel length:​ millimetres inches Case length:​ millimetres inches Pressure output:​ bar psi (piezo) Velocity output:​ metres/sec. feet/sec. Muzzle energy output:​ Joules. ft-lbs.

RESULTS SUMMARY​ Load density:​ 102 %​ Pressure P-Max:​ 62117 psi​ Bullet travel to P-Max:​ 1.1 in.​ Muzzle velocity:​ 3010 ft/sec.​ Muzzle pressure:​ 6365 psi​ Muzzle energy:​ 1046 ft-lbs.​ Barrel time:​ 0.75 msec.​ Powder all burnt at:​ 7.5 in.​ WARNING​ This program does not take the place of a reloading manual published by the relevant powder company for estimating starting loads or maximum loads.​

Fizz

 

[billgatese30]

What data did you use to get that?

221 Remington Fireball Load Data

Explore the world of Nosler, renowned for crafting the finest bullets, ammunition, rifles, and brass. Discover our extensive lineup, including Partition, AccuBond, E-Tip, Ballistic Tip, Custom Competition, and more. Experience superior quality and performance with Nosler products.

www.nosler.com

From the cartridge data in the Nosler online manual:
.224 cal;
case capacity 19.9grn h2o
Case length 1.4”
and using your 17.5grns of N120, 18”, 52grn pill I got the following…

Nb it doesn’t show my input variables… but the pressure of 62117 came up in Amber rather than Red ….looks like N120 is too quick for it…

The BBT "P-Max" internal ballistics simulator

DECLARED INPUT DATA​ The powder used was N120 by Vihtavuori To change the powder, check this box and click re-submit​ Powder space:​ cc grains of water Powder weight:​ grams grains Bullet weight:​ grams grains Bullet type:​ Copper jacketed, lead core ( moly'd) Lead Bore rider with drive band Monolithic solid Calibre:​ 17 20 224 243 (6mm) 25 (250) 264 (6.5mm) 270 284 (7mm) 7.5mm 308 (7.62mm) 303 32 8mm 338 38 (9mm) 375 40 (10mm) 416 44 45 (450) 475 50 577 Barrel length:​ millimetres inches Case length:​ millimetres inches Pressure output:​ bar psi (piezo) Velocity output:​ metres/sec. feet/sec. Muzzle energy output:​ Joules. ft-lbs.

RESULTS SUMMARY​ Load density:​ 102 %​ Pressure P-Max:​ 62117 psi​ Bullet travel to P-Max:​ 1.1 in.​ Muzzle velocity:​ 3010 ft/sec.​ Muzzle pressure:​ 6365 psi​ Muzzle energy:​ 1046 ft-lbs.​ Barrel time:​ 0.75 msec.​ Powder all burnt at:​ 7.5 in.​ WARNING​ This program does not take the place of a reloading manual published by the relevant powder company for estimating starting loads or maximum loads.​

Fizz

62k PSI is way over the top though. CIP states 46K for Pmax, CUP pressure (which is typically higher than CIP), is only 52K according to Google which again is well lower than 62K this load supposedly offers according to the ballistic predictors (GRT/Quickload etc.). Either way I wouldn't want to be jumping straight in to a load that over pressure as thats a sure fire way to put my fingers/face at risk when I pull the trigger!