PTG Bolt Head-- too long?

[kuduman]

Just got my PTG bolt head (LH, LA, .308) after a two month wait. Very well machined. Except... the lugs are 60 thousands too long front to back. So it won't close.

IIRC, .560 vs. the correct .500.

I'm new at this: Can I correct this by screwing the barrel out, and re-headspacing? Or do I need to return the head to PTG?

Thanks.

[palerider338]

Should ALWAYS re- head space when installing a new bolt head and/or barrel. That would fix the bolt oversize issue.

[kuduman]

I was going to reheadspace-- I'm not _that_ new. But the bolt won't turn. Is there really an extra 60 thousandths space in there? Seems like an awful lot. I recognize that if it fits, the barrel's going to need to come out 60 thou. But I don't want to pull the barrel for nothing.

Am I overreacting here? I measured three other bolt heads-- they're all effectively .500.

[palerider338]

Just put the mic on my Manson head space gauges: GO measures 2.245........... NO GO measures 2.254 ....... .009 difference.

Not much room to work with..... turn the barrel out. Head space is too tight right now to turn the bolt...back the barrel out. NBD

[mnbogboy2]

If I remember correctly there is usually about .010 between a Savage bolt head & the barrel face when the barrel is chambered according to SAMMI and a go gauge is snug....So with the longer bolt head the barrel will have to move forward accordingly...Like Palerider338 said you should always re-headspace when changing bolt heads...
Good Luck,
Randy

[stangfish]

9/16 bolt head is for the WSM's. There is a picture of it on here somewhere. Is the boltface .473?

[stangfish]

Found it.
http://www.savageshooters.com/content.php?131-Savage-Bolt-Head-Configurations
http://www.savageshooters.com/attachment.php?attachmentid=635&d=1341581420

L to R
short action (7/16" lugs)
short action controlled round feed(1/2" lugs)
long action (1/2" lugs)
new short action heavy magnum (9/16" lugs)

[stangfish]

I would call PTG and ask them. It should work by moving the barrel out .060 +or- to get headspacing.

[scope eye]

Hi 60 thou in head space adjustment is nothing, when you have a barrel nut setup, it's like 1/8 turn of the barrel not even, for you visual folks, it's like having the barrel stamping at 12 O clock, and then add .60 thou longer bolt head so turn the barrel out, then the stampings would be 12:30, not even an issue, I have seen factory total bolt assembly's vary almost as much, when swapping them from gun to gun.

Dean

[BillPa]

Hi 60 thou in head space adjustment is nothing, when you have a barrel nut setup, it's like 1/8 turn of the barrel

Dean


One turn of a 20 pitch thread is .050". An eight of a turn would get'cha about .002".:p

Bill

[scope eye]

Sorry your right, I was thinking 6 thou not 60 thou, but there is still plenty of threads to still set it, "note to self do not post until you have had your morning coffee"

Dean

[stangfish]

One turn of a 20 pitch thread is .050". An eight of a turn would get'cha about .002".:p

Bill

Bill, .050/8=.00625

[scope eye]

No one likes a show off. LOL

Dean

[stangfish]

How can you show off if you have that black and blue ring around your eye. Seriously, the cool thing about the 8th turn is that the barrel nut has 8 notches. If you use a torque wrench with your barrel nut wrench, you can use the notches and a index mark on the barrel(and or the action if you dont have a torque wrench) and make minor headspace adjustments using the notches to gauge the rotation allowing you to have an idea how much you have changed the headspace. Half the distance between the notches is .0031 linier movement. Center to center being .0062.

[scope eye]

I'm not worthy, I'm not worthy. LOL

Dean

[BillPa]

Bill, .050/8=.00625


Speak'n of not enough coffee........I think I thought I meant "one eighth of "AN INCH" rotation will get'ya .002" . :p

We need a rule.....NO posting until working on or having consumed the 10th cup!!!!

Bill

[stangfish]

We need a rule.....NO posting until working on or having consumed the 10th cup!!!!
Bill

I need a rule....Stangfish cannot post unless he personaly is asked a question.

[scope eye]

Works for me. LOL

Tanks Spanky

[stangfish]

Rule # 2......http://www.steephill.tv/entries/euclid-spill/black-eye-close-up.jpg

[scope eye]

It was a lot worse than that, oh man you have no idea, imagine 50 BMG, but with no muzzle brake, I still have the scar to this day.

Dean