Sticky for Ruger PCC

Interesting experiment I ran today. Posted it on reddit but the gist of the experiment was POI does shift on the Ruger PC Carbine after using the takedown feature.

I feel like I have to go shoot more to verify the amount of shift as I only had enough target paper to try 2 takedown cycles. Since it went up in elevation 4-5 inches.

50 m zero verification
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100 m zero verification (rifle was not takendown after the 50 m zero)
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1st string (took rifle down after the zero verification)
FRslwvI.jpg


2nd string (took rifle down after the 1st string)
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I'm not so sure those targets tell us much. Did you shoot off a bench with a scope or just a red dot.

The gun is capable of tighter groups that those using decent ammo.
Take Care
Bob
 
Red dot off a "bench" the linked reddit post has the full write up as I didn't want to reformat it to CGN mark ups.

8A3KEWc.jpg


The most interesting tidbit was that it took 2 takedown cycles before the POI shifted, since the 100 m zero and the 100 m 1st string were in the expected locations, but the 100 m 2nd string moved. Also 2 strings isn't enough to make a definitive statement but it did show something funky happen that would need further testing.

Any further testing I would conduct at 50 m since I think that is a more reasonable expectation of range with a 9mm PCC red dot.

But if people want to prove me wrong they are free to experiment using a red dot or scope mounted to the receiver and take pictures of their target.
 
You are spot pm moving to 50 yards. The 9MM bullet has the aerodynamics of a fridge. I don't think the red dot is the sight of choice if you want to determine what your rifle will do. Iwould expect some movements of zero. Whether it has a practical affect might be arguable.

Take Care

Bob
 
true that was my initial hypothesis going into this experiment, any potential shift of POI would be minimal for a 9mm rifle and you don't need to spend extra money buying a rear sight picatinny rail replacement. But I wanted to publish my initial results since I spent the afternoon out there shooting. Next time I'll bring extra target papers.
 
I picked up a knockoff scope off off of Ebay it has proven to work well so far. I think it was around 75 US includes mounts, out of China. 1x5. It works pretty good. Pm if you want further details. I would not be surprised to learn they make. Bushnels low end scopes there as well.

Take Care
Bon
 
I'm very happy with my accuracy and consistency with my 2-10x 30mm FFP scope from VisionKing, a budget Chinese maker. Thing cost me about $180 and on my TNW ASR delivers very consistent results at 50 yards. I've only had it out once to shoot 100, and owing to crowds of hikers showing up that session got cut short, just as I'd managed to zero it for that range. But three shots before these last two were on the paper, I did some clicking, and this was the 'final' result, with 147gr Winchester JHP, the scope dialed up to 10x, bipod resting on my pack:

NorVan_Falls-March5-2022-9mm_100yds_sighting_in.jpg


I adjusted it 1 click down and 2 left, but haven't had an opportunity to go out shooting since. Lots of hiking last summer just all of it in places people are too plentiful, and with the cancer in October, well, I've been too busy healing from surgery then wiped out by the immunotherapy drugs for a lot of hiking, let alone shooting. But I hope to produce some decent groups this summer.

A friend who has a couple of the Rugers uses a Holosun tactical type dot/ring sight on one of them, a 1-4x Bushnell on the other. He's not shown me any groups on paper, but says they both hold zero just fine. He assembles/dismantles them every time he takes them out shooting. Tends to use the lighter, hotter stuff. Says they both cycle perfectly with whatever he feeds them.
 
Got the PC-9 brand new few weeks ago.
-Fun to shoot and accurate for what it is.
-Last week I had few FTE ( Failure to eject ) and this week same thing.
Using CC1 124 RN.
-Last week I throw the brass in the thumbler, and noticed the brass are damaged. ( you can see on the picture, the clean brass )
-This week, I just put the brass in the block for picture. ( dirty)
-The brass are all damaged, I would like to know Why ?
-The two picture I took from the FTE, I noticed in both case the brass is upside down and caught by the bolt.
-The other few FTE, the brass were sideways, didnt took any picture, I taught the brass perfectly caugh vertically by the bolt was funny.
-Not really funny anymore as its happening quite often (FTE), and the brass is damaged. thats really bugging me, would like to know why....
Is it possible the extractor is the issue, and if not....any idea
 

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If it were mine, I'd look at either lightening the bolt carrier somehow, or shortening the spring (or getting a slightly weaker spring and testing that). Seems the bolt isn't coming back quite far/long enough to let the brass get thrown clear, so it's getting clipped by the closing bolt, bending the cases or catching them completely. A lighter bolt would be thrown back slightly further - if that's safe in the gun's setup, not allowing it to bottom out at the back end and cause damage. A weaker spring might accomplish the same, and has the advantage of retaining the bolt weight to a) keep the case safely in the chamber for the duration of firing and b), allow the mass of the bolt to keep the spring compressed slightly longer, letting cases have a bit more time to fly clear.
 
A new extractor isn't going to fix an ejection issue unless it was slipping off the rim.
Take a look at the ejector and adjust as necessary. I remember mine needed bent slightly downwards to hit lower on the case head and "flung" the casing higher and out of the ejection port.
 
GimpyGolden said:
A new extractor isn't going to fix an ejection issue unless it was slipping off the rim.
Take a look at the ejector and adjust as necessary. I remember mine needed bent slightly downwards to hit lower on the case head and "flung" the casing higher and out of the ejection port.
Click to expand...

Thanks , did it and it improved a bit but not solving much to be honest
i will lowereed it few thousand see if it change.
 
Don't forget that you're using pistol ammo in a carbine barrel. Fast powder produces a short impulse which may not dwell upon the blowback bolt face long enough.
The inertia of the bullet also plays into the pressure curve. A heavier bullet will "push back" more to provide more action cycling force.

I once did a silly bugger reverse ladder with slow Blue Dot powder under 147 grain bullets out of a Kel Tec S2K.
At about 3.2 grains, it pushed the bullet about two thirds of the way down the barrel, but still successfully cycled the action.
I was anticipating this, so the "squib" didn't cause any problems. I just poked it out with a cleaning rod.

The Ruger PC Carbine's tungsten laden bolt loves the abuse offered by heavier bullets over slower powder.
My hottest load so far is 158 grain bullets over 6.8 grains of VV 3N38, who's brass gets dented, but for an absolutely different reason!
I backed it down to 6.5, saving more brass with little loss in velocity.
BTW, I would never use such hot loads in a S2K, JR, FX9, etc.
 
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