I have a Rem.700 LH in 358 Norma, I want to rebarrel to 338-378 at 36" for a single shot LR rifle only . A couple of questions though, is the bolt face large enough? What dia. barrel is the largest you would go without the use of a barrel block on a 36" tube? Is there enough material under the barrel threads with this large case in a lightweight or heavyweight tube? Anything else I may not be considering too?