Fitch
New member
The accuracy of my CZ527 .223 has been remarkably good up until a few weeks ago when it began to fall off. I suspected it was deteriorating based on where I was hitting ground hogs so took it to the range. Three shot groups had opened up from around 3/8", which it did group after group, to noticably over an inch. Not good.
I swapped scopes, same thing. Borrowed my buddies borescope to peer in the barrel. Muzzle crown looked a little rough,
oo I took the action out of the stock to re-crown it and was surprised to see the rear pillar fall out! It had some how gotten loose in the stock, it was longer than the wood so the action screw was clamping the tang to the bottom metal but not to the stock. Bottom line, the tang was effectively unsupported and free to move around. Not a feature.
The CZ527 only has a rear pillar as it comes from the factory.
I was almost relieved to see this because it looked like it would explain what was happening, "and" I could do something about it. Finding a plausible and fixable cure for a vexing problem feels pretty good truth be told.
I bedded my CZ527 Hornet earlier in the summer. I made it two pillars (I clanged the can with the roll pin because it wasn't going to glue in well), hogged it out from the front of the receiver to the front of the mag well and after gluing in the pillars with the rear pillar slightly proud of the stock wood, epoxy bedded the front of the action. That worked well. The Hornet is shooting 1/2" groups one after the other.
Note, the front pillar has to be long enough (but not more than .005 to .010 longer) that the bottom metal/magazine well doesn't bottom on the receiver - it's better to have the glued in front pillar as the tallest pole in the tent so to speak.
So I am in the final stages of doing the same thing for the .223. I re-crowned the barrel just to be sure and the crown looks really good now. I made it two pillars, glued them in yesterday, and this afternoon went ahead and epoxy bedded it. The action is in the stock with the epoxy curing. I'm hoping to get it to the range late this week to see if that cured the problem.
If you have a CZ527 I hope it is shooting well, but if it isn't, you might look for a loose rear pillar.
I'll post a range report after I shoot it.
Fitch
I swapped scopes, same thing. Borrowed my buddies borescope to peer in the barrel. Muzzle crown looked a little rough,
oo I took the action out of the stock to re-crown it and was surprised to see the rear pillar fall out! It had some how gotten loose in the stock, it was longer than the wood so the action screw was clamping the tang to the bottom metal but not to the stock. Bottom line, the tang was effectively unsupported and free to move around. Not a feature.
The CZ527 only has a rear pillar as it comes from the factory.
I was almost relieved to see this because it looked like it would explain what was happening, "and" I could do something about it. Finding a plausible and fixable cure for a vexing problem feels pretty good truth be told.
I bedded my CZ527 Hornet earlier in the summer. I made it two pillars (I clanged the can with the roll pin because it wasn't going to glue in well), hogged it out from the front of the receiver to the front of the mag well and after gluing in the pillars with the rear pillar slightly proud of the stock wood, epoxy bedded the front of the action. That worked well. The Hornet is shooting 1/2" groups one after the other.
Note, the front pillar has to be long enough (but not more than .005 to .010 longer) that the bottom metal/magazine well doesn't bottom on the receiver - it's better to have the glued in front pillar as the tallest pole in the tent so to speak.
So I am in the final stages of doing the same thing for the .223. I re-crowned the barrel just to be sure and the crown looks really good now. I made it two pillars, glued them in yesterday, and this afternoon went ahead and epoxy bedded it. The action is in the stock with the epoxy curing. I'm hoping to get it to the range late this week to see if that cured the problem.
If you have a CZ527 I hope it is shooting well, but if it isn't, you might look for a loose rear pillar.
I'll post a range report after I shoot it.
Fitch
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