You might shoot it better but the rifle will be equally accurate. I really recomend the Vias brakes. I have one on my 375 RUM and find it to be very effectiveand unlike some of the shark gill style it doesn’t increase the muzzle blast or noise as much as different styles.
This is the one on my 375 RUM before refinishing. I don’t have a great picture of it finished
They do a remarkable job of taming the recoil as well.
About the only negatives I can think of are:
1. They direct a lot of noise to the sides, and sometimes back. This makes it uncomfortable for others sharing the firing line with you at a range, and can also affect your hunting partner or guide. Brakes aren't really "polite" though they are very effective.
2. They can, depending on design, stir up a LOT of dust and debris from the ground. If there are ports pointing down, they direct some of the gasses down, into the dirt. This can cause a LOT of lightweight junk, like dust, leaves, etc... to go flying about at the shot.
Other than that, they're very good to the shooter - reducing even the .300 magnums to very tolerable levels. They're pretty much imperative on something like .50 cal BMG rifles... I'm more of a fan of suppressors, which also tame the recoil some, and of course greatly reduce muzzle blast.
They are a great addition to a rifle if you don't mind the noise... Just double up on hearing protection, I have used Vias, and they are effective. I prefer the style that Nathan makes, however. The side ports are nice because they don't send a plume of dust all over your scope, rifle and face when you touch one off.
I have a Williams Tactical brake on my 338 RUM. I had it installed when I started
shooting the 300 gr AB's at 2700 fps. It really tamed the beast.
Accuracy is excellent and there is no velocity loss.
Spotting your shots on a rifle as light as a T3 isn't easy with any brake. Even if you reduce the recoil to below a .243 the gun will still jump some. That is one reason why I don't like super light barrels. I like to keep the gun a bit barrel heavy to help with jump.