Loads for a 50 Alaskan?

[Coloradoyaler]

Hello

I have a 50 Alaskan built by WWG. I am having trouble getting it to shoot Cast Performance bullets of any weight better than 3-4" @ 100yds.

I looking for cast bullet loads for my 50 alaskan to include powder and bullet. Thank you in advance.

Thanks
Mark

[stubshaft]

56.2 322 - 580gr LFN
52.0 4198 - 580gr LFN (1650fps)
55.0 RE7 - 390gr LBT Arcane (1750fps) <1/2"@50yds.
51.0 4198 - 515142
54.0 3031 - 512500LFN (NOE)

Loads shot out of a 16" Encore with a MGM bull barrel. Loob with BAC or Felix. Velocities are chronographed not estimated. Recoil with the 580's is pretty stout. I have broken 3 Weaver 2X scopes and had one Leupold 2X sent in for reticle repair.

[JJC]

I need one of these

[stubshaft]

It is definitely a HANDFUL.

[BerdanIII]

From: A Big Bore on a Budget, TFS 110-10
RCBS 515-gr - 45.0 - RL7 - LDPE wad
LBT 600-gr - 25.0 - SR4759 - 2.5cc Precision Reloading shotshell buffer
NEI 715-gr - 35.0 - SR4759 - No GC - LDPE wad
The author's standard of accuracy was 2.5", 5-shot groups for four consecutive groups at 100 yards. Rifle based on Model 28/30 Mosin-Nagant.

From: The .50 Alaskan, J. Kronfeld, Big Bore Rifles and Cartridges
LBT 485-gr - 58.0 - IMR4198 - 1983 fps - 1.25" at 50 yds. (55.0 to 61.0 grs.)
OR 53.0 - RL7 - 1711 fps - 0.75" at 50 yds. (53.0 to 59.0 grs)
Rifle was a Winchester Model 71.

The author states that a consistent case length is important for good accuracy and wrote that it could affect point of impact by as much as 2 inches at 50 yds.