Unburnt powder .458 socom

Low pressure 4227 can (will) be inefficient... especially w/ shorter barrels.
(1) Try to remember... what load are you running?
(2) Try Lil`Gun.....

You try 2400? Or even 4198?

... thinking 16.5 [IMR4227] it's published data it's on the can....

Click to expand...

You might want to check that. **

458SOCOM/350gtBullet/16.5gr/IMR-4227 won't even produce 9,000psi,
and would dump 40% of the powder out the end of a 16" barrel.









** Consider in fact you might want to double that.
SEE: https://www.barnesbullets.com/files/2016/03/458-Socom.pdf


.

If you can tell me what molds your using I can see if QL has them in the system. It does have most commercial bullets.

Ive used 4227, but not alot of it, and all with jacketed bullets.

I shoot a lot of magnums and have used IMR 4227. I some times have unburned powder using it also. I've used H110 , 2400, LIL'GUN , N105 and Enforcer and haven't had any unburned powder with any of them.

I use IMR4227 (34gr.) in my .458 SOCOM w/ 300gr lead. Mild load, no feed or unburned powder problems.

Using a reduced load just to keep recoil down is not the answer. You need to keep the pressure high enough to burn the powder or use a faster powder. If you change powders your rifle may not function.
Your choice of light rifle, heavy bullet, large bore and desire for low recoil in an autoloader may not have an acceptable compromise.

Ireload2 said:

Using a reduced load just to keep recoil down is not the answer. You need to keep the pressure high enough to burn the powder or use a faster powder. If you change powders your rifle may not function.
Your choice of light rifle, heavy bullet, large bore and desire for low recoil in an autoloader may not have an acceptable compromise.

Click to expand...

jeeptim said:

The unburnt powder is with Barry's plated 350gr and is 34gr 4227

Click to expand...

Thats not a light load.

You may need to size your brass a little more than you currently are. I ran into similar issues with some reloads that i thought was bullets being off center, but it turns out i was JUST barely sizing the brass enough, so any fouling, or a case that sprung back a little more than the rest would either fail to chamber completely.

Good luck on your new loads, let me know if theres any quickloads info you want.

For reduced loads I use powders like HS-6 and HS-7. For warmer loads I like H110/296, 1680 (4227 is in this burn rate area) and 2400.

I run the GL-Shock stock on my SOCOM. This stock has a spring to help absorb the recoil and it works very well. Makes the recoil like shooting a shotgun so you get more of a push and not a hammer blow.

Of all the powder I have tried in my 458 they all have a decent amount of unburned powder as it is designed for low pressure but I must say there is no accuracy problems so I am not going to worry about it too much.