@ Corn-Picker.
I do not own a 527, it is Armoredmans rifle, I just build him the parts when he wants something they don't make.
But you can see the scope he has on the rifle, and it is a 40mm lens.
I don't know what rings he used on the gun, but there is no conflict with the bolt at all.
Now, Dont sell the 7.62x39 short.
I would use it for Deer up to 200 yards, and I think it is a better performer than a 30/30 at that distance, but Use 130 or heavier bullets for good knock down power.
As far as accuracy, you see that Armoredman can consistantly hit a 8" target at 200 yards and with Cast Lead Bullets.
Jacketed bullets do much better.
And when it Hits, it makes the steel target Dance on the chains.
He will be trying 300 yards in a week or so.