QB .224

[Ribbonstone]

Yes..lathed them shorter, so they are lighter (more like +35gr. than +40gr) and  "sized" them to .2225" (which turned out to be a touch too big).

Knurling as just a way to experiment for free.  Pretty well figured out this rifle is going to want .2223-.2225" if I'm going to close the bolt by hand.

The commercial swaged bullets (although thy do have a hollow base, so can call them pellets and I'd not be offended) sent for a test have a large base band (like .224' or a touch larger), but the driving band is short and the base a little hollow, so that compresses down easily on seating. The main body of the pellet runs closer to .218-.219".  Those I can seat with hard hand pressure.

So the last I'll be doing with this rifle and cast bullets will be making a more or less traditional sizing die.

Considering how well that particular rifle shoots the 25.4gr. JSB's, don't think I'm gaining much with the rifle tuned to this point.  MAy be able to get those 35gr. pellets up in speed by another 100fps....something like 915-920 and about 65 foot pounds.


Then again, may just finish all this fooling around and go back to the JSB 25.4's, as it really seems to have a taste for them.

[Prouzy]

Finally getting back to this!  I was expressing air thru the TP area, dont have a good TP just the hose.  I recessed and it works much better, but still losing air.  I tried some pellets (JSB 25gr .22) and very little, but still some loss.  The NOE 37gr .224 obviously creates more resistance, so greater loss, very noticeable.  Nonetheless, I continued.  I still with stock spring, so only can fit 3 shims (washers) and enough force to not bother going beyond 2000psi, which is fine as Im just beginning this.

2000psi fill (closer to 1900)
652
658
709
724
731
707
672
1400psi

It peaked around 1650-ish, after trial and error, so I started filling to 1700psi to obtain some semblance of a curve for three shots.  Just messing around, threw on a 3-9x scope and was just launching in the shooting area at 50yd, didnt think I was going to sight it in at this velocity.  I noticed I could hit the 2" spinner with all three shots repeatedly.  So I attempted some paper.

First group, 53yd


I use my index finger as its exactly 0.5" width inside cuticle

Second group on paper, $%^&#(+@ horsefly bit me on leg just as I was shooting that last shot down low!



Im pleased so far, will use stronger spring and figure out some better tune port options.  Ideas?

[Prouzy]

From 2100psi with 39gr NOE

750
755
762
755
749

I installed a new TP and has done a better job with air, no leaking.  Im still peaking velocity at 1700ish psi so Im ready to begin work on more spring.  Any suggestions on where/what other stronger hammer springs?

[Horatio]

At that point it gives up hardly anything to a 22LR. Pretty neat.

[UCChris]

You can also get ready made bullets at North American Arms. Yep, the same people who make the cool little Pocket Pistols!

They make a Black Powder version of their little gun, and sell .22 short bullets for it. Very similar to what was sold in Europe for years, but now unavailable.  The NAA bullets are very inexpensive.

Enjoy your new toy!

Knife

What diameter of barrel do you need to shoot the NAA ammo? I've been told that .22 airgun barrels won't work with .22 rimfire slugs.

[Prouzy]

At that point it gives up hardly anything to a 22LR. Pretty neat.

Not sure what that means?

[rsterne]

The NAA bullets will NOT work in an airgun barrel, they are too tight.... In case you missed it, I recently worked with Jared at Arsenal Molds to scale down the Lyman 257420 to .224 cal, at 47 gr.... This was designed to work in the TJ's 14" twist barrel....



The molds are now available from Arsenal, at a very reasonable price....



They may be a bit heavy for the power of your gun, but give another choice for those considering a .224 cal conversion....

Bob

[Prouzy]

They may be a bit heavy for the power of your gun, but give another choice for those considering a .224 cal conversion....

Bob

I am interested in those 47gr (55gr will be too long and heavy, but I may attempt to modify what I have cast and/or get the mold altered).  Im working on this rather slowly and small increments in performance enhancement, as a method to further my knowledge in this process. Current power is with little effort, including low pressure.  Parts for me can be challenging, as I make my way through networking, not being in this very long nor being in a comparable industry, including custom components needing to be outsourced. 

But, its coming along!