Update May 9th My best group yet from my cz858 !! with pics and video.

sniper762

sniper762

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Thanks, great groups again., I was out sunday shooting at 103m on the range finder with an aimpoint, I will try and get a pic, but your groups are alot tighter.lol
 
I have tried various optics from an Eotech to a Leupold. The scopes have been mounted to the rail on the upper handguard so I have also tried different handguards in case the mount was loose. I recently bought a scout mount so this will be my last attempt to get better than 12" groups with this rifle.

sniper762 said:
Do you have a posp scope on it ?
Click to expand...
 
A side reciever rail will get you the most stable scope mounting solution. A upper rail mount will not get you the best accuracy as it gets very hot around the gas port/piston.

What I found causing most accuracy drifts are the thin long barrel heating up. The barrel flexes alot when its hot and causes the POI to shift. Take careful notice on how you rest the rifle also.

Believe it or not, the 15.5 inch military barrels gives me the best results, and the 11.7 inch ones are also very accurate. The shorter barrels have ideal harmonics vs the wobbly 19 inch.
 
Thanks for the info.

twyeh said:
A side reciever rail will get you the most stable scope mounting solution. A upper rail mount will not get you the best accuracy as it gets very hot around the gas port/piston.

What I found causing most accuracy drifts are the thin long barrel heating up. The barrel flexes alot when its hot and causes the POI to shift. Take careful notice on how you rest the rifle also.

Believe it or not, the 15.5 inch military barrels gives me the best results, and the 11.7 inch ones are also very accurate. The shorter barrels have ideal harmonics vs the wobbly 19 inch.
Click to expand...
 
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