Personally I don't care about calculated numbers from a sled with springs. Jerry and I have gone back and forth about it but the bottom line is if my brake is better than his on the same day on the same set up that is all that matters. He can claim all the numbers he wants but I know how his brake is made and I would just about bet mine are more effective. When I get a chance to buy one, I will and prove it one way or the other. His brakes are huge in comparison (1.5" wide) so they might still work pretty well. To a degree surface area can over come poor design.
I have a 338 Lapua and a 300wm that I use just for testing. I also built a 450 Bushmaster to test with. I might build a 6.5 Creedmoor too but to be honest the real testing happens with the big stuff IMO. It's not hard to tame a 6.5 Creedmoor or 308. I'm going to make the programming for about a half dozen different designs in the next month or so to test which is the most effective and if any are better than my current design. It sure is nice having the machines and programming in house to tweak designs at will. That part was a struggle a few years ago. I just need another machine to free up my 4th axis to do the stuff it's designed to do.
Titanium is a fickle material. HSS or Cobalt drills don't last long with it. I'll see how the special end mills I ordered do today. If the testing goes well I'll order a bunch of carbide drill bits and a bunch more material. I'm expecting the .920" 4 ports to weigh about 2oz. They weigh 3.5oz as a blank but a lot of material gets removed for the ports.
I'm glad you like your brake shortthroat.
I designed the machine for Jerry to measure recoil. Springs are a very effective way to get consistent results. Look up potential energy of springs and you can find the formulas to do so. Imagine .. springs in your trigger or any other sprung device, consistent. Anyway, with the sprung sled where the spring rate has been measured, knowing the weight of the sled and the rilfe I can tell you how much recoil the rifle has, nothing more to it than that. From that number I can give you a true reduction in recoil or effectiveness of the brake. no bias.
It's true .. you have some good brakes and until we can test one side by side on the same device then it doesn't matter much. We do test other brakes in the videos but don't call them out by name. Guess we just trying to be nice about it.
The RUM in the picture has a 5 port "Jerry" brake turned down to 1", so that "poor design" remark may be a little off.
The radials we have tested, even turned down to .800" turn out to be slightly better in recoil reduction, 98% effective (97% on sideport), mostly because of the intersecting holes give greater surface area than the flat ports on the side port. How do I know how effective it is? Springs .. The sliding measurements on friction is nothing more than that, you cannot produce any other result other than one moved farther than the other. The movement is not relative to anything.
Oh, forgot to mention tuning of the brake. Yes, our brakes are cartridge specific to get the most out the brake, it does make a difference, additional 10-15% effectiveness. Saying it is 10% better in recoil reduction is irrelevant because the entire recoil depends on weight of rifle, bullet weight, powder charge.. etc .. effectiveness though, measured with springs, can be counted on.