HTC .459 600 grain PB HP mould.

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I’ve been casting the HTC .459 500 grain projectile for a 458 socom. I love heavy bullets and got to thinking…I would love a 4 pin set 600 grain(with the flat nose pin installed) hp mould for 458 socom. I think the heavy bullet would be amazing for expansion. I know most moulds have 3 pins included flat, short and long. I would like to see this mould with 4 pins. Flat, short, long and longer for a deep hp cavity. I would like to see a similar profile to the 500 grain bullet. I posted this on the 458 socom Facebook page and have 5 guys interested already. I will urge them to sign up here on this forum so they can get in line. Anyone here interested in this? I have a name picked out as well MOAB (mother of all bullets). Thanks!
1.darksoldier300-no groove
2.bsev81-either
3.magnum mike-no groove
4.hayfieldfarm-no groove
5.bullseye baldee-crimp groove
6.raffica 762-crimp groove
7.bmike-crimp groove
8.cornmastah-no groove
9.jamesbousman-crimp groove
10.intel6-either
11.dreg-prefers groove but good with none.
12.akfshmn-crimp groove will accept no groove
13.andarxx-prefers no groove will accept groove
14.daviscustom-no groove
15.arwildcat- no groove
16.schizm-
17.dreg-no groove
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[Raffica762]

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Crimp groove ..I have both socom and, 45/70

[timshilling]

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I am definitely in for one! I prefer the crimp groove, however I’ll still get one if it doesn’t have the CG.  I anticipate I will primarily be using this in a 45-70, and occasional use in the SOCOM.  Thanks for putting this together!

[kodydowneyParticipant]

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No problem glad it’s coming together so quick! I’ll update the list.

[Full.Lead.TacoKeymaster]

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I will try to get the two group buy signup posts ready with drawings for both options today if possible so people can sign up for the one(s) they want and make it official and one step closer to happening.

[kodydowneyParticipant]

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Sounds good mike. Looks like 8 are good with no groove a few of that 8 could go either way, pretty sure the other 2 guys that we haven’t heard back from are 458 guys and will want no groove.

[andarxxSpectator]

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I’m in, prefer no crimp grove, but would take either.

[kodydowneyParticipant]

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I’ll add you in

[Full.Lead.TacoKeymaster]

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Because of the length of the bullet, Al is going to have to use the larger mould blocks to build this bullet mould.  The cost will be a little more because of that.  Anybody interested in a shortened version of it?  Like at 500 gr?  Not sure how much case capacity will be left with that long of a bullet shoved into the 458 socom case.  I might try to seat one of the 354’s into a socom case and measure the length of where the 600 gr bullet would end up and mark it on the outside of the case so you guys can see roughly how much case capacity is left.

[kodydowneyParticipant]

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If the 600 grain wont work in the socom that was going to be my next thing. A 500 grain hp. I dont mind spending more to make the 600 grain work if it will actually work. How certain are you that we will have enough room left in the case?

[Full.Lead.TacoKeymaster]

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I’m going to try to seat a 354gr into the case and measure how deep the 600 would sit and mark it on the outside of the case to get a rough estimate of how much case capacity is left.

If the 600 grain wont work in the socom that was going to be my next thing. A 500 grain hp. I dont mind spending more to make the 600 grain work if it will actually work. How certain are you that we will have enough room left in the case?

[kodydowneyParticipant]

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I’m down for the 600 with larger blocks if we think it will work. If not then shave it down to a 500 grain hp and we can restart the process.

[Intel6Participant]

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I honestly was concerned about case capacity, it is why I asked about the nose specs earlier.  When I coat the 354 HTC in HiTek I can seat it long with the crimp groove out of the case. But when I coat with powder it is thicker and so I have to seat it deeper to the crimp groove to get it to let the AR bolt lock up correctly. No big deal with the 354 HTC since it is short it just protrudes slightly below the shoulder but I am concerned if I have to seat this long bullet at the crimp groove depth (whether it has one or not)  it will stick way into the case. The nose of the 500 SP is shaped different and I can seat that out longer even with powder coat.

The current design seems good for the 45-70 but for the SOCOM it would seem better to start with the 500 SP design and modify as desired since it is able to be seated out further to mag length. And now since we are talking two different moulds and cutting two different tools we don’t need to try and make one work for both because we aren’t saving anything.   

[Full.Lead.TacoKeymaster]

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Another option is to do the one with the crimp groove as designed and then the one without the crimp groove we can start to taper the nose a little.  But if the nose is very bulky, feeding might be more difficult with some of the magazines.

[brettsevertParticipant]

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I started off seating my 354 grain in 458 socom with an OAL of 2.14″ which was the longest it would go in my tromix gauge.

Picture of 2.14″ OAL just for visual reference

I have started to seat it deeper in my load work ups, so for realistic purposes in MY barrel lets say 2.10″ cartridge OAL. Case length of 1.575″ leaves roughly .525″ of bullet outside of the case which would mean the new 600 grain design would have .905″ inside of the case. I have loaded the 500 SP bullet with the case mouth even to the body/nose ridge on the bullet which puts about .725″ inside of the case. I have not run into any problems but I have only loaded Accurate 1680 (to 1000 fps in a 10.5″ barrel) so far which is very dense and takes up minimal case capacity. I believe the additional .2″ of bullet and lowering the charge weight accordingly will have enough room. I don’t know how other common 458 socom powders like IMR 4198 will compare as I haven’t yet tried any others for subsonic.

If I find some time this evening I will experiment with charging a case and attempting to make the 500 SP bullet contact the powder to see how much room there is. Then proceed to drop the charge a grain at a time and compare the differences. It’s not the best way of doing it but should at least give another reference as to whether the 600 grain will even be feasible.

[jamesdavis]

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So if we are using an oversized mold block, what are we looking at for a final cost?…..This is something I am very interested in but the cost is not going to be insignificant.  Do we have a guess as to how soon we would have to be prepared to pay for it?

[Author]

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