I think cast bullets for elephants is a fool's errand unless willing to try something like this:
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Those poor-quality images are screenshots from our hero's Youtube.
I have never tried it, but I might want a mould like Matt's Bullets used,
and I recall Ranger Rick brand associated with that sort of bullet too.
Then I would cast them in BHN25 that would stay that hard longterm.
54.0 grains of H4895 gave 1518 fps chrono from a 22"-barreled .458 WIN MAG M70 pushfeed Dirty Harry rifle.
Pushing BHN25 through a 0.460" sizer gives spring-back to 0.461",
and that is the best performing bullet in all my .458" to .459" grooves.
Gas-checked and PC-painted and aged 2 weeks on the shelf and they are back to BHN25 for good.
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Above is from a slim-barreled .458 WIN MAG, McGowen No. 4 Sporter trimmed to 23" barrel length. No lead fouling, no paint fouling, just powder fouling.
Eastwood Ford Light Blue is my favorite PC-paint now.
Even better than Harbor Freight Red.
No "high-tech" coatings needed.
Your 458 has .459 groves ? more like SAMI specks of .450 bore and .458 grove can be +2 thousand over but not often run into on 458 win mags they just did not make enough 458 win mags.
and you are using a custom barrel not a mass produced factory barrel ?
yes your 730 gr bullet is the same shape as my 695 gr bullet depends on the lead mix on the bullet weight out of mold .
My mold with 5% tin 95% lead mix ( called 20 to 1 mix ) drops 705 grains and makes a perfect 2.5 inch flower at 100 yards on a steel plate shot from a custom air rifle at 750 fps at 100 yards .
See photo
And yes you can't push your shown very long bullet fast enough in a 458 win mag to achieve the speed needed with this very long bullet. IMR 4895 is to bulky AA 2230 or Win 748 would help a little on the precious case space with this bullet design in the 458 win mag .
This is why the 458 Lott was invented powder space behind bullet compared to the 458 win mag.
Now the 458 win mag really shines with barnes or cutting edge 450 gr bullets at 2350 fps
cant deny this fact.
But we are talking about a lead bullet for elephant which will have to be over 500 grains to
achieve the penetration needed in a frontal brain shot.
I will cast up the lead mix I have told you about and will shoot in a savage push feed 22 inch barrel
model 116 Safari SS 458 win mag in the up coming testing . On lone from a friend .
My 535.68 gr bullet is looking as the best bullet nose for a straight line penetration my 695 and your and your 730 gr just will not stay on a straight line and give the penetration needed to blunt of nose for the speed genotrated in 458 win mag
TESTING WILL TELL THE TROUTH ON NOSE DESINE for a lead bullet.
My model 70 is being converted to a 458 Lott.
In my model 70 win control feed I could extend the bullet OAL another 100 thousand over what you I am seeing in your ammo from your photo I was seating on the first grease grove not the bullet crimping grove .
I was able to reach 1836 fps with this bullet in 6 2 92 15 BHN lead in my model 70 458 win mag.
Not fast enough for elephant frontal brail shot with this very long blunt nose bullet .
Yes my lead has arsenic in it already , all of my lead is certified lead straight from a US foundry .
I know every small particle in my lead mix.
I have water quenched my bullets and can reach 30 BHN ( 6 2 92 15 BHN ) in one week no problem I just do not trust water quenching that much it will go back to 15 BHN around the one year mark .
The new lead mix will have 7% TIN AND ONLY 6% ANTIMONY the tin is needed to add strength to the lead mix the common mistake is adding antimony to increase lead hardness
and yes you will be brittle adding more antimony than tin .
I can see your photo of the end of a barrel there is no threading on your barrel so I am supposing you have no way of seeing what is expelled out of the barrel with any bullet no mater the bullet metal being used.
Here is a simple test for you to use on your barrel take a pice of 8x11 paper wrapped around the end of your barrel and tape it securely behind the muzzle only stick past the end of barrel may be 1 inch max and shoot you will see what is imbedded on the paper
please shear with us the photos showing your powder coated lead bullet is not blowing out lead dust from the muzzle .
All lands in the barrel will cut through the powder coating with the lands cant stop this unless you paper patch the lead bullet . all lands are over 1000 deep ( thickness of powder coating usually 1000 ) or you could not get the spin on your bullet the lead would strip and never give a grouping even at 25 yards.
Yes all lead bullets have spring back may be you should try a lee push through die at .457 for the spring back of .4575 or.458 ( depends on your lead mix ) you might be surprised what diameter bullet really shoots in your custom 458 win mag barrel the best , just a friendly suggestion .
I have no idea what your max speed of testing with a lead bullet in a 458 win mag is ?
I have taken a 350 gr lead gas checked bullet over 2600 fps ( 458 win mag ) and yes you need a muzzle break or a silencer to help on sight recovery for the next shot unless you are Mr Universes body builder ?
I am a 64 year old man with both shoulders being rebuilt many years ago and my knees have been bone on bone for many years thanks to being a bull doggier and playing football in my younger years.
Knees are coming along very well with a special therapy no need for replacement .
I am up to 3.5 miles with a 12 pound rifle and shell belt holding 20 458 rounds in 2 H and 30 min a couple of times every week around my outer fence line on my ranch .
My back is not as it was when I was 20 years old really hurts shooting over 200 rounds off a bench
or shooting sticks of big bore ammo 375 H&H 416 'S and 458's . I do not own a 500 or 600 nitro double rifles .
I have been shooting the big calibers every month for many years this is being address with inversion table and hot tub and a nerve block on lower back . Working very well now.
Keep up with your postings maybe you and I can come up with lead something that works in the 458 win mag for elephant frontal brain shots .
I have decided to take the easy way around and switch to 458 Lott
Davidjr