458 SOCOM: the journey begins!

[Spook]

I'm looking for a way to backbore my 16" down to 12" of rifling and crown,with 4" of "free bore" to the muzzle.
MartyTW has had this caliber functional in 8" of barrel.

[Rikky Lee]

Thanks Spook, I have read on Marty's board that too much pressure wastes these cases and I think that with 18 inches to start with I can then trim a few inches in a few months when I have got the hang of things.

I really am interested in trying the heavy 500 plus grain VLDs at longer than usual range and part of me thinks that 18 inches would help get that accuracy.

Anyone done this yet?

[d-mon]

Hello,
I got my gunsmith on the phone last week.
He is working on the winchester action (blueprinting) and the pacnor barrel next week.
We have agreed to cut the barrel to 14". The muzzle will be threaded at 22mm diameter with a 1mm picth for 15mm long.

The barrel being a 1 in 13" I will not launch pills heavier than 500gr. Probably conventional lead cast bullet actually, as the flash jacketed boat tail bullet from US of A are not available here in that caliber.

I will have to work on the can next.
I posted on another forum for ideas of internal design that may work with the socom, but it seems that they do not know much about the subject and are more interested by pistol cans.(or they have terrible secrets to hide: fair enough!)

Soon, the 458 socom will be mine! I can't wait!

ND

[HUNTER2]

Have seen some AR barels that were short with a permanately pinned flash suppressor. Cut off, rethread and tap, bore out, screw back on and silver solder, or pin ????

[Rikky Lee]

The trick is to permanently bond the barrel extension with either super expensive two part glue (I had access to someone once - he told me the price per unit of this stuff) or silver soldering. Easier than back boring which can sometimes leave a little to be desired in Target Rifles for example.

I have asked my guy to turn the (simply massive 1.2" diameter) barrel down to 0.9" (at least) straight taper. I'm hoping to persuade him to go 0.8!

[Rikky Lee]

The rifle is nearly complete and I am thinking about starting loads.

Is it true that only Large Pistol primers are recommended? Why not Large Rifle primers?

[d-mon]

Hello Ricky,

The lrge rifle primers do not work simply because the primer pockets are just deep enough for pistol primer and not deep enough for rifle primer.
Maybe you could ream the primer pocket deeper with a special tool like the one sold by K&M but I am not sure if there would be enough material left at the base of the case.

I called my gunsmith this week and he has still not finished to builmy 458 socom.
At least I got a cheap lyman mould to cast 405gr bullets for later on.

ND

[Rikky Lee]

Ahhhh.

Well I think I will be visiting some gunshops in the next few days.

I "need" to get my fingers on the 500 grain RNs and then some 500 plus grain VLDs in the next few weeks...

[Fritzcat]

Show us a pic of your rifle so we can drool over it.

[thehouseproduct]

Originally Posted by Spook

I'm looking for a way to backbore my 16" down to 12" of rifling and crown,with 4" of "free bore" to the muzzle.
MartyTW has had this caliber functional in 8" of barrel.

Is this so you can develop a SBR load while waiting for the stamp?