Discussion in 'Reloading' started by Quaticman, Nov 7, 2019.
What is your "go to" powder for the .458 Winchester Magnum with 500 grain bullets?
I heard that some factory ammunition gets good velocity by either blending powders to a secret recipe, or using some kind of secret powder. Any thoughts on this?
I’m not too worried, I’ll cheerfully use 2206H and am happy with the results.
IIRC, ADI AR 2206H is equivalent to 4895 and AA 2460
I've tried them all...nothing impressive-always in the 2,000-2,150ish fps range (even w/ longer 450 gr Barnes bullets.) Traded in favor of the PERFECT .416 Chatfield-Taylor.
450 Barnes Ramshot TAC
500 Federal Ramshot TAC
I do recall the great Woodleigh bullets being the shortest, so try those with the max, compressed powder loads and you'll prob have slightly better success. Kevin Robertson is dead-on about this short mag's limitations. Use the 450 gr bullets to get the velocity up to the effective minimums. My son shot a buff with one once (after we got to within 20 yards!) Ok as a stopping round, only because those sorts of distances are ok with it. (TAC is made by the same co. as Western, AA-all very similar, denser, more compressible grain-sized powders).
Not surprisingly, the gun was very accurate and a pleasure to shoot relative to most big bore carridges!!!
From powders that are easily available to me, I'd try Vihtavuori N133 or N530 first.
I use H335 and Accurate 2230 in my Zastava .458 WM. At near Max loads I get an average, 5 shots, 2140 fps shooting Hornady 500 grain DGS and DGX bullets.
H335 and RL7
A few books, including Hornady (possibly Nosler as well?), indicated H335 as ideal, so that's all I've ever used. Starting load in Hornady is 67.5, maxing at 76.3.
Does anyone have any good data for a 500gr Gas Checked cast bullet load for the 458WM or 458Lott??
I also have a Zastava M 70 and will be using the same Hornady bullets.
Using the Accurate Mold 46-500L2 I have tried the following:
65.0 gr IMR 3031 for 2038 fps
69.0 gr IMR 3031 for 2150 fps
65.0 gr IMR 4064 for 1940 fps
74.0 gr H4895 for 2218 fps
72.0 gr Ramshot X-terminator (Belgium production) for 2116 fps
74.0 gr Norma 202 for 2093 fps
74.0 gr RL-15 for 2044 fps
76.0 gr. RL-15 for 2096 fps
64.0 gr RL-7 for 2010 fps
all velocities taken @ 15 feet from chrony out of 24" barrel
Check out the Accurate Mold website for dimensional drawing of the bullet. It has two crimp grooves and a full diameter nose to help fill the 458WM throat. IMR 3031 really shines on 1900-2000 fps practice type loads. I use data for the old Hornady 500gr RN soft point as a reference when working on loads.
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