I've been shooting my 300RUM for some time now without any real problem in dealing with the recoil. However, when shooting the 210-240gr bullets at top velocities the scope has just brushed my eyebrow one too many times for comfort. Sooo..... over the winter I sent the custom Broughton barreled action out to Kirby for the installation of one of his PK brakes. While he has several sizes that would have worked, I chose the "Slim" version for its less obtrusive appearance. I assumed that its effectiveness would have been reduced along with its size and number of baffles. I finally got out today and fired the rifle. First round was a 220gr SMK over a near max load of H1000. When the hammer dropped and the recoil pulse ended, my first reaction was that the cartridge had been undercharged somehow. One quick look at the printout on the Oehler 35 told me that just wasn't the case. I fired an additional 5 rounds and can honestly say that this rifle recoils LESS than my .308win. It's hard to believe, but that is how I see it. There is no comparison between this PK brake and the Vais brake which I've used previously on other rifles. The PK is just unbelievable. As far as increased blast - I did not notice any increase in noise from my position, but did feel a slight pulse of air moving my hair. Like most braked rifles, it probably wouldn't be a good idea to stand on the side of the shooter if a PK braked rifle is being fired. Kirby did a great job on the installation and his brake works FAR better than I would have believed to be possible. While I prefer unbraked rifles for hunting, todays big magnums made me rethink the issue and I'm glad I did.