458 SOCOM

[cjensen]

Veral, have you made a mold that is good for the 458 socom?
What bullet would recommend  I use for the 458 socom?

Thanks, Carl

[Veral]

  Yes I've made quite a few molds for that chambering, yet I don't recall whether it's that hopped up 45 ACP or a rifle handgun cartridge. 

  No matter though, as I make molds to fit anything anyone wants to shoot lead through, from 22 up to 8 bore.  For the 45 ACP hotrod, I normally make the LFN in whatever weight the customers wants, for all the long list of 45 rifle  chamberings, any weight you want, and my normal recommendation is the LFN.

[cjensen]

It's a .458 short neck bottleneck, so I am concerned where the gas check sits, and the COL is restricted by the magazine length. So ordering whatever weight I want is really not the answer I was looking for. 
Thank you,
Carl

[Veral]

  I can still make about any weight you want if I fill the throat with body and cut the nose to bore ride.  I'll need a swaged throat slug to do this, and to hold the tightest precision on the bore ride nose section, you should order only a two cavity, not four cavity as it difficult to hold all four noses to the close fit needed for best results.
  When I have a throat slug I fit bullets so the check will stay inside the case neck a little, so it doesn't get inverted and ruin accuracy when loaded hot.

[cjensen]

I guess I must be using new math with all it's problems. Since the cartridge neck has about .325" before the gas check is down in the powder and the bullet only has another .675" to stick out of the case and still fit in the magazine, there might be some other restraints  on the the length of what I would call the shank and the tip.

[Thebear_78]

Most 458 socom throats dont allow you to use a lot of longer nosed bullets.  We have had to throat out several of them to accommodate heavier bullets, like 500gr hornady rn bullets in suppressed socom used for moose control at the airport.


Feeding has also proven hit or miss with most cast loads.  I'm guessing a 280-320 gr Lfngc or WFNGC would probably Orkney best.  Anything much heavier might prove difficult.

[cjensen]

I was leaning towards an 350 grn GC marlin profile, but I don't know how far it would extend into the neck and if it would have a COL to fit in the AR magazine. I just bought a RRA 458 Socom upper. It's not looking like I'll be gambling $185 on a mold unless I know for sure.
Carl

[Veral]

  Smart man.  I wouldn't take a chance either, because there is no good reason to take a gamble.   If I  sell anyone a mold that doesn't make them happy, I'll feel worse than they do, and will probably lose their business indefinately.  So I make sure I sell what will work if at all possible.

  Email me at LBTisAccuracy@localnet.com and I'll give you some assistence here, with measurements or with bullet samples which you can test to be sure they work.   Ditto to all readers who are concerned about getting a proper bullet.  I specilize in giving the optimum bullet, and to do that need to have a swaged throat slug, along with proof dummies as follows.

  I often send samples and have the customer seat at max length which will cycle through the action, and or at max length which will chamber.  With two such dummy rounds I can supply a bullet which fits and cycles perfectly, and a fit to the throat and bore which makes them outperform any other offering you can find.