Just about finished with my 460 Encore and as most everyone that knows me will say I am all about accuracy, but I also like good looking and well balanced rifles. I have found that long barreled rifles are often barrel heavy and don't have good balance so I take steps to remedy this when I can. the 26" barrel I have for mine is a full 1" from end to end and I thought it would be muzzle heavy so I also purchased a laminated stock to add some weight to the but stock. After assembly, the 26" barrel looks short but the balance was near perfect. I decided to install the brake in an effort to tame the beast and at the same time get the proportions right and was very pleased with the appearance and balance. The brake only adds about 1.6" to the overall length so I think you will be pleased with the 27" barrel (My barrel with the brake is 27.6" and looks right.
Even with the 27.6 " total barrel length, the rifle is still shorter than most standard length rifles.
It remains to be seen what the velocity difference will be, but it will be interesting ether way. But the look and feel with the longer barrel is very good and as soon as I finish pillar bedding the fore arm, I will post my results and look forward to your results.
Another interesting detail about the 460 S&W is the SAMMI pressure limit.
https://www.google.com/search?q=SAMMI+pressures+for+460+S&W&rlz=1C1CHBF_enUS865US865&oq=SAMMI+pressures+for+460+S&W&aqs=chrome..69i57.22212j0j8&sourceid=chrome&ie=UTF-8
Although I don,t believe in pushing cartridges to the limit, These pressure does allow a re loader to exceed the Load data in this cartridge. I had thought it was about the same as the 454 Casull.
J E CUSTOM