What in the world is 22 HS?

[thx997303]

My Father in law was just given a Sears 22 that says it can take 22 HS, 22 Short, 22 Long, etc.

So, what is 22 HS?

[frankenfab]

High Speed!![smilie=l:

[Mk42gunner]

High Speed!![smilie=l:

What he said.

Probably made shortly after the high velocity loadings for the .22LR came out. A lot of the smaller boys rifles weren't safe to use with the high velocity loads, so some rifles were marked that they were safe with them.


Robert

[pietro]

Many new shooters don't realize it, but older .22 rimfire guns can, and will, break - IF HS ammo is used/fired in them - the reason for the marking.

Even as good a quality a rifle as a Marlin 39 needed a bolt change (with appropriate markings) to accommodate HS ammo - or the bolt (close to unobtainium) would crack.

Just because a particular firearm might look like new, and additionally look modern - it's not necessarily so.

.

[Mk42gunner]

Many new shooters don't realize it, but older .22 rimfire guns can, and will, break - IF HS ammo is used/fired in them - the reason for the marking.

Even as good a quality a rifle as a Marlin 39 needed a bolt change (with appropriate markings) to accommodate HS ammo - or the bolt (close to unobtainium) would crack.

Just because a particular firearm might look like new, and additionally look modern - it's not necessarily so.

.

pietro, another quality gun that needed modifications to work with HS ammo was the first model of the Colt Woodsman. I don't recall just what was changed, the mainspring housing, maybe?

Robert

[thx997303]

Well, his rifle pierces rimfire primers.

This one has me scratching my head.

[johnlaw484]

Head Space!

[thx997303]

Hmm, I wonder.

How can I check the headspace? Are there go- no go gauges for 22 rimfire?

[thx997303]

Here is a picture of cases fired in the 22.

http://i312.photobucket.com/albums/ll331/thx997303/100_2361.jpg

The one on the left is pierced and the one on the right is not.

[pietro]

If a RF's been dry-snapped enough, two things can happen, from the FP striking the edge of the empty chamber.

The FP tip can either break or develop a sharp edge - sharp enough to pierce the case rim.

The chamber wall can develop a bulge, from the metal swedged out from the cartridge rim recess into the chamber area, which (when it becomes advanced) can cause hard extraction of fired cases.

Slight bulging is hard to see - and the only true cure is to swedge the metal back into the chamber wall with a $22 tool (Brownell's) - no filing.

A slight bulge can also keep an unfired cartridge from fully seating, allowing easier piercing by a sharp FP.

I would pop the FP out of the gun and hit the forward egdes with an India stone to round off any sharp edge(s), and also check the chamber wall in the area where the FP would strike.

.

[Three-Fifty-Seven]

So what is the magic number? What is High Speed (or Velocity) I see some listed around 1250 fps, but then again, still same label at 1650 fps . . .

I just bought a Remington 511P . . . do you think that it will handle the 1250 fps loads? Or do I have to shoot only the sub-sonics?


[smilie=s:

[Mk42gunner]

Shawn,

Going from memory here

~1150 is standard velocity, i.e. subsonic and match ammo.

~1250-1300ish is high velocity, used to cost more than the standard velocity, now it is the cheapest you can buy.

1500+ is the hyper velocity stuff that was started by CCI with the Stinger in the 70's. Some examples besides the stinger are/were

Remington Yellow Jacket

Winchester Expediter

Federal Spitfire

I am sure there are more.

Your Remington should be fine with high velocity .22 Long Rifle ammo; assuming it is in good shape.

Robert

[thx997303]

Tried firing the gun today.

It absolutely refused to feed the rounds. Seems the FP protruded when it should have retracted.

The rim of the round would become firmly held between the feed lips (I think) and the firing pin. The bolt could not move forward because of this.

[DLCTEX]

The view of the fired cases shows the rim portion under the firing pin is not supported, possibly due to dry firing damage. Most modern guns have a limited travel of the firing pin to prevent impacting the barrel face when dry fired, some older ones did not. Check the barrel face for damage, and see if the firing pin is protruding too far when fired.