Hello,

Excuse me, but I'm French and I do not speak your language. Just, I read you for 2 years with google translator.
Thank you to excuse me if I can not answer your questions.
I built a 460-square a short magnum on the basis of a CZ 550 Magnum (WM 458) and I present you. Good luck to all.

https://www.youtube.com/watch?v=v9bUNMsXEg0


460 SHORT A-SQUARE MAGNUM

Histoty (Historique)
Designer : Arthur ALPHIN
Designed : (date création) 1978

Spécifications (Caractéristiques)
Parent case (étui originel) .378 Weatherby Magnum
Bullet diameter (diamètre balle) .458 in (11.6 mm)
Case length (longueur étui) 2.50 in (63.5 mm)
Overall length SAAMI (Longueur totale ) 3.50 in (88.9 mm)
Case capacity H2O (capacité H2O étui) 115.5 gr (7.48 cm3)
Rifling twist (pas du canon) 1 in 10 in (254 mm)
Primer type (amorce) Large rifle magnum (CCI250)
Maximum pressure (pression maxi) 63,860 psi (4403 Bars)

Ballistic performance SAAMI (Perfomances balistiques)
Test barrel length: 26 inches (660 mm)

Bullet weight type (balle, poids et type) : 500gr (32,4g) A-SQUARE Lion Load
Vélocity (vitesse) : 2420 ft/s (738 m/s)
Energy (energie) : 6507,5 ft.ibs (8823 Joules)
Powers test : H4895, IMR 4065, RL12, RL15

Rifle (Carabine)

Action (boitier classe) : CZ 550 magnum (458 WM)
Barrel (canon) : PAC NOR twist 10' (stainless)
Stocks rifle : MPI STOCKS (for 550 CZ Magnum)
Weight rifle (poids) : 10,36 pound (4,7 kg)



MY RELOADING for 460 SHORT A-SQUARE MAGNUM

Bullet (balle) Hornady DGX
BulletWeight (poids balle) 500 grs (32,4 g)
Powder (poudre) RELOAD SWISS RS60
PowderWeight (charge) 95,37 grs (6,18 g)
Primer (amorce) CCI 250
Brass Make (étui) 460 Weatherby
Barrel Length (longueur canon) 26 inches (660 mm) – Twist 10'
C.O.L (LHT) 3.323 inches (84,35mm)
Velocity (vitesse) 2405 fps (733 m/s)
Group (groupement) 1,3 in / 3 shot / 109 yds ( 33mm / 3 tirs/ 100m)
Submitted Date (date) 08/17/2015 - 15:30:00 PM - 18°c
Submitted By (nom) Jeanmomo
Gun Info (carabine) CZ 550 magnum barrel (canon) PAC-NOR
Energy (joules) 6402 ft-lbs (8680 joules)
(Quantité de Mouvement) (23,62 kg/m/s)
(Densité de section) (30,50 kg/m2)

Comment (commentaire) : the ammunition should be able to go into a standard action Mauser (la munition devrait pouvoir passer dans un boîtier Mauser standard)

The barrel will be cut to 22', the sights are posed and the rifle will be painted black.

My goal is to do a reload 550gr 2300fps for outstanding section density and penetration

Any caliber who as case parent 375 hh ( Lott, Ackley, Watts ) can not reach 2300fps with 550gr.

Just the 460WBY and 450 Rigby, but the WBY as twist 14' and is brutal, and the Rigby request a longer-action

Very good.

By "target organs" do you mean internal parts of the rifle?

quote:

Originally posted by Dan416:
Very good.

By "target organs" do you mean internal parts of the rifle?

Excuses me for my bad english : "Rear and front Sights"

Welcome to Accurate Reloading. Looks like a very nice setup. What are you planning to hunt with it?

quote:

Originally posted by impala#03:
Welcome to Accurate Reloading. Looks like a very nice setup. What are you planning to hunt with it?

Thank you, I dream of buffalo.

c'est bon! Jean

Bienvenue à bord!

Welcome and very brave of you to go for such a wildcat caliber in EU!

Hello American friends, Here are my new reloaded . I am happy because I was able to reach 2300fps in 550grains

Bullet: Woodleigh 550 gr RN, Barrel 25 inchs, Power RS60 - 50 °F COAL: 3,33

94,95 g 2287 fps
95,32 g 2293 fps
95,32 g 2273 fps
96,14 g 2306 fps - filling 105,5% -

I have not yet finished my groups , but 400grains FN , they are promising, close to the MOA to 55 yards

Bullet : SPEER FN 400 gr - Power Vihta N560

92,6 gr 1977fps

It is a soft load for the wild boar by at my home

By