PILLAR BEDDING THE REMINGTON M-700 IN AN H-S PRECISION STOCK
Many times, I have heard the argument, "The Aluminum Bedding Block, in an H-S Precision stock has a machined surface and therefore should be just as straight as your rifles action."
IS YOUR ACTION STRAIGHT? MOST ARE NOT!
During the heat treat process, each receiver will warp in its own small but unique way. This warpage, by itself, prevents a stress free fit of the receiver to the stock.
The Aluminum Bedding Block is more rigid than a stock of wood or fiberglass. and I belive, MORE RIGID THAN EVEN THE RECEIVER ITSELF.
This is why that when the guard screws are tightened, IT IS THE RECEIVER THAT BENDS, AND NOT THE ALUMINUM BEDDING BLOCK.
THE PURPOSE OF PILLAR BEDDING IS TO ELIMINATE STRESS
Pillars work by providing a receiver to bedding surface contact point which immediately surrounds the guard screws.
The closer this line of contact is to a guard screw, the LESS leverage there is available to bend the receiver when the guard screws are tightened.
Conversely, the farther away the contact is from the guard screw, the MORE leverage there is available to BEND or STRESS the action.
Accu-Riser Kits contain 2 each of the following sizes, .005", .010", .020", and .030". This allows the choice of any height necessary, from .005" to .065" in .005" increments.
"Spotting In" with no guard screws, and hand pressure only, is the only method which provides an accurate view of your receivers contact with its bedding surface in the stock. Just don't be surprised if the contact points are small, and that there are not many of them.
I don't put much faith in a bedding pattern created by guard screws which were torqued to 65 in. lbs. it will almost always be a false pattern, or picture, because its a picture taken when the receiver was bent.
There is nothing wrong with 65 in. lbs. of guard screw torque, but only if your action has a foundation strong enough to support that much pressure. MOST WIll NOT The good news is that a solid aluminum bedding block with stainless steel Accu-Risers and epoxy filling all the voids is the strongest foundation available.
You may have a new H-S Precision stock that you are ready to install. Or you may have a used Remington Sendero. You may have an accuracy problem that you are trying to track down. Or your rifle may be shooting pretty well, but you still want the best fit possible.
In any case, I suggest that you or your gunsmith do a "Spotting In" process with your barreled action and stock.
Knowing where the high spots are is always interesting, and you may even find that by scraping away a little paint, you can maintain receiver to stock clearance with a .005", to .010" shorter bedding pillar stack.
Select a combination of Accu-Risers which when placed between the receiver and the stock, create a clearance of .010" or less.
Verify this clearance by assembling the entire rifle (with Accu-Risers in place) then be sure you have enough clearance to slide a piece of paper between the receiver and the stock at any point. Less clearance is better, but you must have at least "some" clearance everywhere.
This clearance is often achieved with an Accu-Riser thickness of .035" to .045"
The following is an example of clearance, and how to center a barrel in its channel.
"Just Jim" Carmichel once wrote that a barrel should be floated enough that 5 $1.00 bills will pass freely between the barrel and the barrel channel. I'm glad that Jim specified $1.00's because, being a gunsmith, that's all I had. After measuring these 5 $1.00's with a micrometer, I found them to be .021" thick. They were a little crumpled, so yours may vary. Double this number to get the total clearance on both sides of the barrel. In this case, that number is .042. A Remington M-700 Varmint barrel measured .918" just behind the black forend tip.
I wrapped this same spot with 6 turns of masking tape, and now it measured .960" or .042" larger.
Let's say that this barrel channel has Jim's recommended .042 " clearance, (.021" on the right, .021 on the left, and .021 under the barrel.) Just remove 1 wrap of tape for a clearance of about .004 " all around.
Remember, the same rule that applies to the receiver, (some clearance) applies to the tape on the barrel (some clearance) . You can get close, but don't touch!
This is the easy way to center a barrel, and it works because the top of the Accu-Risers are flat. This way, the receiver is free to move from side to side and follow the barrel to whatever point it is centered in its channel.
If your action has been blueprinted it was done while the receiver was under no bending pressure or stress at all.
Those locking lugs, which were machined and lapped to fit so well with the receiver at rest, will NOT fit the same way if the receiver is forced to bend by pressure from the guard screws.
If this fit of the locking lug surfaces is to be maintained, a receiver at rest must be maintained!
When you install a set of Accu-Risers, the irregular surface on the bottom of any receiver can find its own resting spot in a bed of soft epoxy.
When the entire rifle is assembled with barrel centering tape and Accu-Risers in place, verify clearance one last time. The barreled action must be supported only by the Accu-Risers and have no other contact between the receiver and the stock or the barrel and the stock.
Now you should be ready prepare it to dissassemble the rifle and for your normal epoxy bedding job.