Higgisons powders 30-06 brass. Imperial, Browning, metallverken

[prairie lover]

Dogleg, I still may need some more mentoring / coaching about the firing pin spring in my M70 Alaskan .375. I seem to have eliminated the misfires after installing the new factory warranty replacement, but the bolt lift is still kinda weak and firing pin dents in spent primers are "minimum" in my opinion. Because this rifle may be used for dangerous game at some future date, I want more confidence that it will always go boom. I'll send you a text, let's have a visit some time.

The firing pin in both my new production model 70s are kinda pointed. More so than other guns. I could see that giving a smaller impression on the primer. A very different shaped pin than a vanguard or remington.

If I decock my bolt and push down on a very accurate scale with the firing pin, any idea on the pounds required to move the pin let's says 40 thou?

 

[Dogleg]

The old style M70 factory spring was 23 pounds. I would imagine the new ones are supposed to be about that. I tested a new one the other day to see the difference between cocked and un-cocked pressure because of another thread. 18 pounds to make it move and 21 pounds at the cocked position.

There’s 30 pounders available.

 

[prairie lover]

The old style M70 factory spring was 23 pounds. I would imagine the new ones are supposed to be about that. I tested a new one the other day to see the difference between cocked and un-cocked pressure because of another thread. 18 pounds to make it move and 21 pounds at the cocked position.

There’s 30 pounders available.

My tikkas and new production model 70s start to move at around 18 lbs. Rem 700 and 783 22 lbs. A bad tikka and weatherby vanguard 14 lbs. The one tikka has only fired 500 rounds and started having issues. Bad spring. The vanguard is a varmint rifle and is in need of its 3ed barrel so it's got a reason of needing a new spring.

Comparing numbers across brands and even different build generations could be tricky cause one would have to take into account the weight of the striker/firing pin and the spring tension combined.

 

[Longwalker]

Put on a digital scale, with a strip of steel contacting the protruding firing pin of my new M70 Alaskan, compressing the pin almost to the bolt face requires 18.4 lbs. of pressure.
Like I said, it works so far, but is not confidence inspiring.

 

[Dogleg]

I wouldn’t put it past Winchester to put light springs in their rifles to make them smoother when potential customers work the bolt at the gun counter. Makers have reworked magazine followers to make them smoother when people work the bolts on their empty rifles and get giddy when they don’t feel the follower dragging on the bolt. Never mind that what it does empty makes zero difference when it’s loaded.
It’s not just guns; think about vehicles. The designer/engineer could make a great handling suspension, then marketing will ask for it smoother and the bean counters will ask for it cheaper.

Striker spring weights are measured in the cocked position, at least according to Wolff. They are pretty good about giving the stock weight as a reference; not that great at shippng to Canada anymore. PTG sent me 11 springs for 100 bucks the other day, but that just helps the Remington guys.