Author Topic: .458 Choices  (Read 840 times)

steveoh

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.458 Choices
« on: May 10, 2018, 11:08:19 AM »
I have a package showing up today which will take advantage of the .458 ammo I have on hand. :)

Left to Right:
340 grain Hollow Point (Mr. Hollowpoint)
250 grain Round Point (Mr. Hollowpoint) Hollow Base
220 grain Round Point (Mr. Hollowpoint) Hollow Base
228 grain Hollow Point (Noe Mold with two sets of pins for HP, and one for flat point)
170 grain EPP type (Accurate Mold)
143 grain Round Ball (Hornady)
286 grain .575 Round Ball - (Hornady) for scale!

Purty aren't they?
« Last Edit: May 10, 2018, 11:10:23 AM by steveoh »


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rsterne

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Re: .458 Choices
« Reply #1 on: May 10, 2018, 11:22:49 AM »
I only have a couple of choices in .457 cal.... The Lee 457-340-F and 452-228-1R (which casts at 0.456" but only 216 gr.).... plus a .457" Lee roundball.... My Hayabusa can hit 550 FPE with the 336 gr. (860 fps) maxed out.... or I can tune it for 5 shots at 950 with the 216 gr. (450 FPE)....

Bob
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steveoh

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Re: .458 Choices
« Reply #2 on: May 10, 2018, 11:31:52 AM »
I only have a couple of choices in .457 cal.... The Lee 457-340-F and 452-228-1R (which casts at 0.456" but only 216 gr.).... plus a .457" Lee roundball.... My Hayabusa can hit 550 FPE with the 336 gr. (860 fps) maxed out.... or I can tune it for 5 shots at 950 with the 216 gr. (450 FPE)....
Bob

I will have to wait and see what works. I have three molds that might be good. I have a funny feeling I will be testing like crazy, and going through massive amounts of air.

228 grain Hollow Point (Noe Mold with two sets of pins for HP, and one for flat point)
170 grain EPP type (Accurate Mold)
143 Grain Round Ball - Lee Mold

I do have high hopes for the NOE Mold. Gotta cast some with flat nose. Perhaps in the morning.

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steveoh

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Re: .458 Choices
« Reply #3 on: May 22, 2018, 12:00:45 PM »
I only have a couple of choices in .457 cal.... The Lee 457-340-F and 452-228-1R (which casts at 0.456" but only 216 gr.).... plus a .457" Lee roundball.... My Hayabusa can hit 550 FPE with the 336 gr. (860 fps) maxed out.... or I can tune it for 5 shots at 950 with the 216 gr. (450 FPE)....

Bob

Bob, what kind of distances do you shoot with your Hayabusa?

What is your air consumption per shot?

My .458 DAQ is sucking down somewhere between 800-900 psi per shot. I get two shots. Wondering if this is typical air consumption, and if I can't get this thing to be a little more efficient, while still shooting reasonably at 100yards. So far my best bullet is around 230 grains in terms of accuracy. It's a short fat flat point bullet that I'm casting from a Noe Mold I mention earlier.

230 grain @3200 psi is traveling at 921 fps for an FPE of 433.31.

Erik Henderson was shooting this gun at 3600psi, and that makes me nervous. I did make one shot at 3600psi and it made 957fps for an FPE of 468.14. I'm way more comfortable shooting at 3200 psi, as okayed by Dennis to keep the gun from dumping all the air on the second shot.

Anyway, I appreciate your feedback.
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rsterne

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Re: .458 Choices
« Reply #4 on: May 22, 2018, 07:06:39 PM »
I had a DAQ .308 Exile, and it was WAYYYYYYYYYY oversprung.... Stock it got 3 shots of 836, 786, 742 on 1200 psi of air with 120 gr..... I compressed the hammer spring fully to "set" it, which shortened the LOA from 5.44" to 4.50" and reduced the cocking force from 28 lbs. to 20 lbs.... After ONLY than change I could get 5 shots of 833, 832, 824, 811, 792 on 1000 psi of air.... Both were with 3000 psi fills.... Note that my 5th shot was faster than the 2nd shot stock.... Efficiency went from 0.38 FPE/CI to 0.88.... It looks like your .458 suffers from the same problem.... Try setting the spring a bit at a time, check your shots, and if necessary keep going until it is completely compressed (coil bound).... Record the LOA each time in case you go too far, you can always stretch it out again.... If after setting the spring completely you still have a descending shot string, then shorten it a coil at a time....

I have never used my Hayabusa other than just in my shop during initial testing.... It has a 500 cc 250 bar bottle feeding a 140 cc plenum, so the total volume available is 640 cc (39 CI).... When tuned for a 7 shot string from 3620 psi I get 901-939-904 with a 216 gr. bullet, for an average of 408 FPE at 0.96 FPE/CI, ending at 2510 psi.... For 5 shots, same bullet, I can average 437 FPE (954 fps), for 0.86 FPE/CI, ending at 2680 psi.... With a 336 gr. bullet I can get 7 shots averaging 800 fps (477 FPE).... All strings with 4% ES.... It peaks at 551 FPE with the 336 gr., with a declining shot string....

Bob
« Last Edit: May 22, 2018, 07:13:17 PM by rsterne »
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steveoh

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Re: .458 Choices
« Reply #5 on: May 22, 2018, 09:02:44 PM »
Thanks Bob, this is awesome.

I have had this poweritus thing where I want big numbers for FPE. Now I see the errors of my way.

What I really want is accuracy at distance. I will not be happy until I’m whacking a 3” round target at a 100yards at will. 200 yards would be mighty awesome also. But getting two, three or more goods shots is a desire also.

I think my particular DAQ .458 maybe wants a long pointy bullet, or a long flat point bullet would make it happy also. The short fat squatty ones are not making it happy. Well at least with me behind the trigger.

I got an extra spring for the .58 DAQ. With the intention of having a spare so I could mess with one as you are suggesting.

Anyway, good stuff!

I had a DAQ .308 Exile, and it was WAYYYYYYYYYY oversprung.... Stock it got 3 shots of 836, 786, 742 on 1200 psi of air with 120 gr..... I compressed the hammer spring fully to "set" it, which shortened the LOA from 5.44" to 4.50" and reduced the cocking force from 28 lbs. to 20 lbs.... After ONLY than change I could get 5 shots of 833, 832, 824, 811, 792 on 1000 psi of air.... Both were with 3000 psi fills.... Note that my 5th shot was faster than the 2nd shot stock.... Efficiency went from 0.38 FPE/CI to 0.88.... It looks like your .458 suffers from the same problem.... Try setting the spring a bit at a time, check your shots, and if necessary keep going until it is completely compressed (coil bound).... Record the LOA each time in case you go too far, you can always stretch it out again.... If after setting the spring completely you still have a descending shot string, then shorten it a coil at a time....

I have never used my Hayabusa other than just in my shop during initial testing.... It has a 500 cc 250 bar bottle feeding a 140 cc plenum, so the total volume available is 640 cc (39 CI).... When tuned for a 7 shot string from 3620 psi I get 901-939-904 with a 216 gr. bullet, for an average of 408 FPE at 0.96 FPE/CI, ending at 2510 psi.... For 5 shots, same bullet, I can average 437 FPE (954 fps), for 0.86 FPE/CI, ending at 2680 psi.... With a 336 gr. bullet I can get 7 shots averaging 800 fps (477 FPE).... All strings with 4% ES.... It peaks at 551 FPE with the 336 gr., with a declining shot string....

Bob
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steveoh

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Re: .458 Choices
« Reply #6 on: August 22, 2018, 10:26:21 AM »
Two new molds:

.458 320gn hp and 330 GN

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steveoh

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Re: .458 Choices
« Reply #7 on: August 26, 2018, 08:12:48 PM »
Got a new 405 gn LEE mold. Cast lead today like a madman.

Interesting the average weight of this bullet is 420grains, not 405. I am running 100% lead, so maybe that's why.

I discovered today that these molds all prefer higher temperatures to fill out the mold. I was running the Lee Lead Production Pot - 20-lb. Capacity at #9 on it's setting of 1-10. Didn't measure the temp but is was zinging.  bullets all came out nice and shiny with a minimal amount of artifacts or frosting. I kept the molds hot, and that really made a difference also.

Tried recasting some of the Lyman hollow points that are advertised as 330grains. But like the the Lee molds this is casting on average 349 grains. Interesting.

Can't wait to shoot some of these.

« Last Edit: August 26, 2018, 08:15:14 PM by steveoh »
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steveoh

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Re: .458 Choices
« Reply #8 on: August 26, 2018, 08:43:34 PM »
Heh, just found this thread Bob:

http://castboolits.gunloads.com/showthread.php?201123-Casting-Pure-Lead-at-High-Temperatures

Good stuff! Once I cranked up the heat, I started getting decent bullets!

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