Very good choice. The Germans invented the hammer forging process because they couldn't produce barrels fast enough to keep up with the consumption of them on their machine guns.
Pretty well common knowledge. The reason I believe that this type of barrel is not used in competition is because of the heat generated by shooting so much that the barrel built in stresses from hammer forging make the barrel distort slightly. Of course they are good when cold shooting and I believe you about the capability of less than .5 MOA. Border single cut their rifling and lap with lead so you can be sure of a good result. Stress relieving the barrel after each step which will guarantee a good job. It would probably take several hours to produce the barrel you have chosen not even counting the 100 strokes of lapping in the procedure. Let me know how your project goes, I also am interested in Border products.

It is better to be judged by 12 than to be carried by 6.