If you are interested I have a clamp-on, 9", 1.250 bore, 6061 aluminum barrel block in the shop that's just about ready to go.These barrel blocks are precisely machined and have not been buffed for a mirror finish.Also included are four aluminum pillars for bedding. The block I have listed above sells for $200.00 shipped but I can custom make blocks to your barrel diameter for an additional $35.00
The bore on These blocks are drilled and then reamed for a smooth and precise bore and then the outside of the block is cut true to the bore.Here is what I tell people when wondering what they do
#1- They are an excellant heat sink in which they suck heat away from the throat area of the barrel.
#2- when the barrel block is installed,the action is free floated which relieves stress from the action.
#3- you are supporting the barrel further out, so instead of hanging a 30" barrel you are only hanging 21" of barrel.
Here are some pictures of what the block looks like.
6" block 6 - 1/4 28 cap screws torque to 70 in. lbs
8" block 7-1/4 28 cap screws torque to 70 in.lbs
here are two groups shot at 700 yards with the barrel block rifle.As you can see they don't hinder accuracy any.