accuracy – Page 5 – KatNap Fever!

Yes, she’s shooting pretty well, but unintended consequences rears its ugly head: the pillar raises the barrel a bit more up off of the fore-end, so the scope zero has now gone much higher. I’ll need at least a 30 MOA ramp to bring it down.

Well, 30 MOA didn’t cut it. Turns out I needed much more. So I grabbed the old 20 MOA ramp and commenced to filing. Comes in at about 45-50 MOA.

Now that’s a ramp! However . . . The forward mounting screw now sticks down into the receiver and binds the bolt enough to keep it from going into battery. Hmmmm. That’s what dremels are made for.
But now I have the MOAs to shoot at 300 yards with no hold-over.

Looks like this rifle likes CCI Standards for regular chow (although I know she like some brands of match-grade ammo for dessert). More on that later.

She sprays most other kinds. Looking at past data, CCI Standard groups have gone from an average of 1.71” at 50 yards to 0.682”. That’s down 0.489”, almost a full half inch and 1 MOA! Accurizing successful, so far.

But from a low of 0.373” and a high of 1.03”, both with a flyer, I’m still not completely happy. Almost time for a Part 4.

So how did she shoot after our first accurizing steps?
Terrible. All over the place. What gives?

As it turns out, torque on the action screw dramatically affects point of impact and group size. So, back to the range with my Wheeler Engineering FAT wrench.

10 inch pounds to 25 inch pounds, and group size from .466” to 1.421”, a huge difference, but with accuracy nodes at about 13 inch pounds and 20-23 inch pounds.
So far, so good. On to pillar bedding (which i probably should have done first).

The pillar is sort of the shape of a flattened mushroom with a hole through it.The top surface of the pillar should sit at or slightly above the wood where the receiver normally rests, and the bottom goes through the stock to a new escutcheon. The pillar and escutcheon are glassed in place to become a permanent part of the stock. The new action screw now pulls the receiver down flush to the pillar – metal to metal so no compression of the wood in the stock.

First, scary cutting with drill press, levels, etc. Then Forstner drill bit cut. It fits! Glass in place.