Home Forums Reloading Big Game Rifles pet loads for the 458 win mag??

Can you please give me some ideas for loading the 458 win mag with bullets in the range of 300, 325, 350 grains,,,for powder on hand , I have IMR 4895. thanks ahead of time.

.458 Winchester Magnum

Bullet Load Powder O. A. L. Velocity Energy Comments

300gn Remington 70gn Rel 7 2308 24 inch barrel Mark X Mauser
71gn Rel 7 2386
68gn IMR 4198 2491
69gn IMR 4198 2514 Compressed load

300gn Hornady 73gn AR 2207 2571 4372 22 inch Barrel Model 70 Super Grade
74gn AR 2207 2595 4487

300gn Barnes X 75gn AR 2207 2640 4644 Best all round loads for medium game

350gn Barnes TSX 75gn H 4198
78gn H 4198 2582 5182 Mild E-01
AA2230
76gn H 322

400gn Woodleigh 75gn Rel 7 2244 4475 1 hole accuracy Model 70 Super Grade
77gn Rel 7 2283 Very good load
74gn H 322 2336 4847 Mild good load
74gn H 4198 2454 5350 Mild E-32
74gn AR 2207 2417
75gn AR 2207 2437

400gn Barnes X 74gn H 4198 2434 5263 Big Game Load
74gn H 322 2363 4961
76gn H 322 2380 5032

400gn Speer FP 58gn AR 2207 1857 .45/70 Marlin Duplication load
70gn AR 2206 2101 .45/70 Ruger Duplication load

405gn Remington 75gn Rel 12 2011 24 inch barrel Mark X Mauser
77gn Rel 12 2071
72gn Rel 7 2286
73gn Rel 7 2328
67gn IMR 4198 2233
68gn IMR 4198 2271

450gn Barnes TSX 70gn H 322
72gn H 322 2381 5666 MAX - Not Compressed
AA2230
67gn H 4198 2292 Mild E-242
68gn H 4198 2359 Mild E-208 1.196" @ 50 yds open sights

500gn Barnes TSX AA2230




Bullet Load Powder O. A. L. Velocity Energy Comments

500gn Hornady RN 65gn IMR 4198 2065 22 inch Model 70 Super Grade
66gn IMR 4198 2078 Top load
73gn IMR 4064 1960 Compressed load
65gn Rel 7 2032
66gn Rel 7 2041
75gn Rel 12 1981
76gn Rel 12 2034
65gn AR 2207 2093
66gn AR 2207 2119 Top load
68gn AR 2206 2009
69gn AR 2206 2024

500gn Hornady Solid 72gn IMR 3031 1980 4354 22 inch Model 70 Super Grade
74gn IMR 3031 2065 4736
76gn AR 2206 2126 5019
77gn AR 2206 2154 5152
78gn AR 2206 2178 5268

510gn Winchester Factory 2010 4576 CZ 550 Test Rifle


550gn Woodleigh 65gn H 4198 1998 4847
65gn H 322 1918 4494
67gn H 322 1975 4765
68gn H 322 1973 4753 Open sighted @ 50 yards
69gn H 322 2020 4984
70gn H 322 2048 5124 Heavy Recoil
74gn AR 2206 2027 5019 Great Dangerous game load

600gn Barnes RN 72gn AR 2206 1978 5214 CZ 550 Test Rifle


JW

AGW,,thanks for the fast reply...I will work up some loads,,, best I can get (within the last 6 months) is 2.5 inches at 100yds. I was hoping someone would have a load that would produce better than I can make...seems like I am stuck with a poor set up. I like this rifle (CZ550) but I want it to shoot groups in the range of 1.5 inches.

I don't think I ever saw a .458 that would not shoot under MOA for 3 shots if it was properly set up. Saw a lot of riflemen who could not shoot that well but the rifles seem most capable.

Cloverleaf groups are exceedingly common at 50 yards in my experience.

JW

AGW,
Thanks for the info. I enjoy your posts. Please keep them comming! Would you explain what you mean by the "Mild E-XXX" comments that follow some of your data? Also, it appears that you might have intended to include AA load data but if so it didn't make it in. Finally, what is your thinking about using the 450TSX as the soft/solid combo for Buff. My results in use of the TSX in .338WM 225gr on animals as large as Eland has been surperb. Finally, finally, do you have a favorite load for the 450 TSX? Thanks for your time!

In my CZ, I get 2225 fps. from 72 grns. of H4895 and Fed.215 primers with the 450 grn. TSX. 1 1/2" groups are common for me with this load.

I'll look up my load tonight for Hornady 350 grn RN's tonight. Cloverleafs @ 100 yds, about 2550 fps. Pretty sprightly pig load

350 grn Hornady RN, 68grns IMR 4198, crimped on the cannelure in my BSA. No pressure signs but follow the usual precautions, work up to it, etc.......

30mm,
I have a CZ550 in 458WM that will shoot an inch consistently with 450 or 500 gn bullets but throws 400gn or lighter all over the place, 3 inch groups or larger (some much larger with terrible fliers). Lighter bullets also group 12 to 18 inches higher than the 450 and 500's. The long WM tapered throat will allow a short bullet to come free of the case neck before it has engaged the rifling, mine must have been cut with a new reamer as it seems to allow a short bullet to mis align before it hits the rifling. My intended solution is to have the chamber reamed to Lott length but am concerned about ruining the accuracy with heavier bullets. Don't forget the mag is long enough to load some bullets (450 TSX) to 3.6+ inches overall which helps minimize powder compression using longer bullets. Hope you get the lighter bullets to cooperate.

"MILD" is my impression on whether the load is approaching top end pressures.
"E" numbers are the extreme spread recorded on my Oehler 35P chronograph.

I don't always take these numbers too seriously as I find that some pretty decent accuracy can be seen on occasion with lousy, meaning wide variation and the opposite where bad grouping can be noted with very small variation in extreme spread.

Because I hand weigh every charge, I have attempted to control the loads as much as humanly possible so that is the extent of my obligation to the load.

At that point, it will shoot well in the given rifle or not.
John

I use enough H-322 to power the 500 gr Woodleigh PP bullets to an easy 2150 fps, that load rocks on accuracy in my old tang safety Ruger African 458.

Haven't hit anything big with it either, but strongly suspect bullet performance to be stellar.

Gunner