A pretty astute crowd we have here . . . I went online searching and found more information, an owners manual.
Forrest r...You are right as rain about these stock, now pillar screws....the rear is added. Here's a couple pages from that CZ452 manual...
I noticed the bedding on the rear pillar and had questions in my mind about that also...well, until I examined the bottom side of that receiver and it looks to have a long radius from side to side, it doesn't look flat. That would explain the bedding between the outer edges of the tube/pillar & underside of the receiver in the rear. At least it satisfied me yesterday when I thought I was looking at a factory configuration.
I think the CZ455 followed the discontinued 452 (1993-?) and if that is correct, they re-engineered & added another stock screw forward on the receiver, actually looks like they moved them both...
This leaves me with quite a few questions now as I digest all this. I did write a note to the seller asking many questions about this build (he never responded, don't know whether the seller was the owner or inheritor and selling it) . I didn't meet him as the gunsmith was the middle man.
Not ever seeing or shooting a rifle of this nature, I had no idea of what is involved in this class of weapon. I was impressed by everything when I first handled it in the shop...
When I first saw this for sale in the gunshop...I thought..."what a great time to get into shooting precision F-Class, here's the whole set-up ready to go."
Being a Neophyte, I am just now learning all the in's & out's that obviously take years to learn. So here I am as I stand uninformed in so many ways....but I am a quick learner and learning a good foundation is paramount before I am able to just take advice and act on it...I need the '101-Details Class' so I can make up my mind as to what sounds & is legitimate.
So that leaves me with the question I ask of 303Guy... One of many questions but one that I need to sort out...
Here's a question out of curiosity.
Take a look at the machine rest and the groups it shot with this Eley Match @ 50 yards in the tunnel. Notice how well that receiver is bolted to the rest and the barrel is literally clamped.
Notice the groups it has produced that have that horizontal displacement the same as I got today...ok?
Explain to me, if you will...why that machine rest is making the same horizontal spread.
That machine rest is the only thing I have to set a bar for performance with this rifle.
So far . . . nobody is posting any 'un-cherry-picked' series of practice targets that'd show me that there is no horizontal displacement in what they consider a fine F-Class rifle.
The part where I keep saying that, "I don't believe that the harmonics behave in a strictly vertical manner", is just that...I don't yet 'believe', I am assuming this with the little information I have thus far. I have explained why I believe this several times and don't see the need to repeat it again here.