What settled you on those two?
Something you're likely to experience with that caliber, yet few seem to talk about: concussion back on the shooter. The bigger the magnum, the more people want to put a brake on it. What the brake does with the blast when redirecting it is just as important (if not more so) than the recoil reduction.
Concussion on the shooter is detrimental to our ability to follow through as well as our long term health from shooting braked rifles. Keeping the blast off the shooter was a primary concern of several Olympic shooters that I interviewed while developing the various brakes that I make. They all agreed that they would rather have to shoot without a brake than shoot something that throws blast back on their face. Concussion to the face has long term negative effects to our eyes and ears especially. Short/immediate term (IE follow up shots) have been proven to be less repeatable when the shooter is being concussed. Therefore, their conclusion was to avoid any chance that will happen.
Taking that in to account is how I ended up with the brakes that we did. They're all top of the pile for recoil reduction but the key factor is what happens to the blast. It's not on the shooter and that's critical.
The Shockwave is what you'd be looking for on a 338 LM. I have 33 caliber versions finishing up in SS on the mill right now, they'll be available on the website this weekend.
Cut recoil and muzzle rise, increase accuracy with the self-timing Shockwave. Easy install, no machining or gunsmithing required. At PVA, we engineer repeatability. 100% made in USA.
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