.270 Parker & hale


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sureshot
July 22, 2010, 10:57 PM
my Grandfather and I where recently sighting in his .270 Parker & hale (circa 1960 - 70) (not Sure of the exact year) and we only shot three shots because 2 out of 3 primers fell out. My initial though was that the ammo was faulty, but my grandfather told me that the gun has a history of this. he took it to a gunsmith but this was before my time so over 16 years ago.
My question is what would cause this? Could it be the firing pin?
Your answers are appreciated!.

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Cypress
July 22, 2010, 11:07 PM
Excessive headspace can cause primers to back out. Was the one that stayed in flush with the case or backed out some? Someone will be along shortly to throw more ideas.

sureshot
July 22, 2010, 11:08 PM
thank you
i will go check

375shooter
July 23, 2010, 12:29 AM
I've never heard of primer falling out before. My first guess also would be faulty ammo. If it's not the ammo, the only thing I can think of also, is excess headspace, but I would imagine it would take a lot of that for the primers to fall out. I've seen primers backed out sightly, before.

fireman 9731
July 23, 2010, 12:36 AM
If you are shooting reloads it could be due to worn out brass.

Runningman
July 23, 2010, 01:25 AM
If it is doing this with factory loaded ammo than excessive headspace would most likely be the issue. Considering the pressure the 270 Win runs at, I wouldn't shoot that rifle.

The headspace issue may have been faulty from the factory. Or the receiver locking recesses or bolt locking lugs may be to soft and set back is increasing with each shot.

sureshot
July 23, 2010, 02:42 PM
Thank you we did immediately stop shooting the rifle and will take it to a gunsmith somete this week. The ammo was factory load federals.

rcmodel
July 23, 2010, 02:53 PM
Excess headspace does not cause primers to fall out.
It only causes short case life for reloaders because the cases will break in two from excess stretching. On high-pressure rounds like the .270, the case expands and stretches to fit all the excess headspace, and stays that way with the primer still seated correctly.

Primers falling out can only be caused by excess pressure expanding the casehead & primer pocket beyond it's ability to recover. Or reloading the same case over & over so many times the primer pocket just wears out and gets loose.

The first thing I would do is inspect the rifles bore for excessive copper fouling.
See if there is still rifling visible, or if it is completely filled with copper fouling from bullet jackets.

The next thing I would do, after a very through cleaning with copper solvent, is slug the bore.
Driving a lead slug through the bore and then measuring it with a micrometer will tell you if the bore is actually .277" or not.

It could be Parker-Hale screwed on a .25-06 barrel and chambered it for .270 Winchester.

The third thing I would do, if the bore is in fact .277" is make a Cerro-Safe chamber cast and see if the throat or leade is cut properly. A too short leade will cause the bullet to jamb into the rifling before firing and pressure will be much higher then normal.

You can also check it at home by coloring a bullet with a black Magic Marker and then chambering it.
When you eject the round, look at the bullet and see if the rifling scraped off the black ink.
If it did, you have a too short chamber throat or leade.

Should that prove to be the case, a gunsmith can run a .270 chamber reamer in the chamber and cut the leade properly.

rc

Cypress
July 23, 2010, 08:38 PM
I revoke my previous statement. rcmodel is usually (if not always) dead on. I didn't consider the pressure. The primers I have seen back out were all low powered rounds in rifles with excessive headspace. The .270 is NOT a low pressure round.

I always learn something here!!!!

Float Pilot
July 23, 2010, 09:02 PM
What RC said...
Can you post a couple photos of the brass? How did the necks look?

I just had some rounds do that this last weekend because I was loading them super hot....
But that was expected...

You also need to double check the ammo.
I had to fix a rifle for a local guy last winter due to pawn shop ammo. Somebody had loaded up some crappy hand-loads and re-boxed them into a factory box. The rifle owner bought a couple boxes of this junk at a pawn shop and was shooting them until one jammed into the chamber.

I was 300 H&H ammo, but somebody had seated a few 8mm bullets into the 300 H&H cases...So he had a few that were 308 caliber and a few that were 323 caliber.
He actually shot a few of the over-sized bullets before he brought it to me with a jammed up action.
It used to be a very nice Belgian made FN supreme. But now it is a rust bucket on a fishing boat...Anyway, I ended up chucking his pawn shop ammo and he finally bought some real ammo...

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