The T3B (black) is the standard T3 tapered back, KG Gunkoted Black & opened out for the .338 Lapua Magnum.
It is specifically manufactured to replace the factory Savage one.
Easy DIY fit no gunsmithing required, using the factory crush washer.
The T3B is 25mm, 0.984” diameter, 69mm, 2.72” long & weighs 90  grams, 3.17 oz.
Here is a T3 coated black fitted to a Savage 338 Lapua Magnum

Here is a T3 coated black fitted to a Savage 338 Lapua Magnum

 

T3B Terminator shown next to the factory Savage brake and a 338 Lapua round

T3B Terminator shown next to the factory Savage brake
and a 338 Lapua round

T3B on a Remington 700P

T3B on a Remington 700P