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The 30BA sound suppressor screws over the brake and dramatically increases the rifle's "shootability" and rifle shooter system accuracy.
A quality suppressor will reduce recoil similar to a muzzle brake. In addition, there is some speculation that a more controlled muzzle environment helps mechanical accuracy of the rifle, although I am not aware of any studies that prove this either way. Most people will get effective accuracy improvement in the "rifle and shooter system" when a quality sound suppressor is added.

The downside to .260 Remington is that high quality match ammunition is not ubiquitous, like it is for .308 and .300 Win Mag. Right now Black Hills and Cor-Bon manufacture match-grade .260 Remington ammunition, while Remington, Federal, and others sell hunting loads that you might be able to find at a local sporting-goods store. There are rumors that another major manufacturer of match-grade ammunition is going to introduce .260 loads soon.

The vast majority of competition shooters load their own ammunition, matching their final loads to their rifles to get the right mix of accuracy and ballistics. Historically, availability of superlative quality brass has been an issue for .260 Remington. Remington's brass is not known for consistency. Some competitors have good luck with it, and some do not. When I started loading .260, I did not have good experience with the Remington brass, so I transitioned to using Lapua .243 Winchester brass that I necked up to 6.5 mm and then turned for uniform necks. This produced very accurate, consistent, and tough brass but the investment of effort was high.

When behind the rifle, it feels deceivingly like a Sako TRG-42, one of the most proven military sniper weapons systems.