Sks & cz858 ammo test results

Ganderite

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Range Report – CZ858
I repeated much of the testing I did two weeks ago. The Red Dot base broke near the end of the last test while I was testing muzzle brakes, so I used the opportunity to install a 7X Long Eye Relief scope. I thought a 7X scope would be more appropriate for accuracy testing than a Red Dot.

The results were almost identical. I shot 4 groups (a handload and 3 flavours of Milsurp) all shot about the same (about 3.5”), similar groups to the last test.
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I like this rifle. It shoots everything quite well and is measurably better than a SKS.

I have 3 of these rifles. The short barreled one has no optics, and at my age the opn sight is almost invisible, so it got a peep sight too. This is the L sight out of a AR15. The vertical rivet at the rear of the action cover has been replaced with a bolt that holds the sight in place.

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Range Report – SKS with 4X scope
I repeated much of the testing I did two weeks ago. There is a general belief that the scope base integral with the action cover is too wobbly for any kind of accuracy. My rifles have been modified since the last test by running a ¼ x 20 tap through the cover pin channel. A bolt now holds everything solidly in place.

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I added another SKS to the test. This one has a peep sight fitted to the cover. The peep off a Lee Enfield L sight.

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The bayonet was removed from the SKS rifles for this test. My theory is that hanging a wobbly lump of steel on the end of a barrel does not help accuracy. I found that groups were rounder this time and a bit smaller.

The ammo was also shot again in my heavy barreled Remington 788. I made some Mexican Match (substituted a quality bullet for the milsrp FMJ. Various powder charges were tested. Best was 25.5 gr, which is about a half grain more than the factory charge. It grouped 1.030”

The approximate average group size of the rifles was:

Rem 788 – 1.25”

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CZ858 - 3.6”
SKS – 4.0”
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The nut on the end of that bolt is superfluous. I am looking for a blue bolt, or a bolt I can blue. It will be trimmed to 1 1/4" and be flush with the receiver. No nut is needed, since the cover section and both wall of the receiver are threaded, so everything is kept in the same relative position.

The nut is ugly, but I suppose it does prevent the bolt from getting loose. Some blue locktite would do that.

Crappy Tire only has these bolts in stainless. Looking for them in blue.
 
Yes, that was milsurp powder pulled and re-measured.

I have a quantity of commercial brass and have used 4198 for some testing, but have not yet run any over a chrony. I will also try some 1680.

The only reason for the Mexican match was to see how accurate the Remington was, so i would know how much of the big milsurp group to blame on the ammo. I am going to try pure handloads in the rem with some 155 gr match bullets.
 
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