I have narrowed my build down to a broughton barrel 5c is it worth getting it in a 28 finished length over a 26? My grand plan is to shoot the Berger 180vld around 3000fps
Any help is appreciated as it is my 1st build
26" should be good for 7mmRM. 26 it long enough to burn the powers for that cartridge, 28 will give you marginal more velocity, but decreases the stiffness. All that being said, 26" is the way to go unless you're thinking about going into the ultra mag range of cartridges.
If I wanted to shoot 180 VLD's at 3000 fps I'd go to a bigger cartridge than a 7mm rem mag. I also would never put a 28" barrel on a rifle I intended to use for hunting, but that might not be your use for it.
I have a fluted 28" 7RM #6 contour and the extra length is worth it. I run 180's with Retumbo at 3030 - 3050 fps depending on the powder lot. It doesn't even break a sweat doing it either. I've got 6 firings on my current batch of Winchester cases.
I say go with the 28" barrel. If you don't like it, have a couple inches taken off. The Sendero contour will give you plenty of meat and if you flute it for maximum weight reduction it will balance better. If it's a pack rifle, a 26" might handle slightly better. I've hiked my 28" 7RM up and down some nasty places and never found the barrel to be a hindrance.
I have a 27 3/4" barrel, all I could get out of a 28" blank, on my 264 Win mag and I don't think it is too long for a hunting rifle even using in shooting houses. It does give me around 100 fps more velocity over a 26" barrel.