In this case, something from the manufacturers would likely be treated the same as it was with L/55 and DM53. So BAe/Royal Ordinance/RARDE yes. But again, two things to remember:
1) Its needs to be an exact figure listed. Not any kind of calculated answer based on other data.
2) Developers still have the final call on everything. Its not down to me or any Technical Moderator to decide what's "good enough" other than what we have been told by development. Thus far, we have simply been told a source with a direct MV value is required.