ok, let's take a step back here! pressure bedding was/is used to obtain 'acceptable' accuracy. you will usually get decent groups, but rarely excellent groups. that is because of the obvious inconsistencies any interference in the barrel harmonics make.
any barrel can be made floating, and if bedded properly at the action end, it's likely that it will improve its accuracy and consistency as well.
Paul, if you are not happy with the grouping, yes, float it, but have it properly bedded, or do it yourself if you know how/can learn how.
don't float a barrel that's not properly supported at the action end, that's why you tend to hear stories of people floating barrels and grouping getting worse.
there's no barrels that are designed for bedding nor any designed for floating,nor receivers, they're all mostly made the same way, that's all a pile of fairy tale Sh*t.
there's no magical myths to this.
brithunter will of course provide us with a story of many rifles that were accurante and fully bedded, and he's right to do so, but the fact remains that pressure bedding is and always will be a way to resolve 'other' fundamental problems in a rifles construction such as poor receiver inletting, or concentricity between barrel and action, a misaligned bore drilling or bad chambering job, etc.
some contentious debaters may come and say that's why midland and PH's were often pressure bedded