Re: Savage 12 FTR ???
Ah. The other 'ORA' ;)
The funny thing about the charge weight... most loading manuals say somewhere in the 44gn range is 'max. The one exception may be Nosler. I think I have one of their books around here that says '48gn', which is a bunch, even with Winchester brass. Keep in mind that most of these load manuals are written for the lowest common denominator - a 24" barrel, possibly with a 10" twist. With the longer barrels and slower twists of target rifles like the 12 F/TR, you are already operating somewhat outside the domain of the traditional load manual.
I've had exactly one barrel that made over 2900fps with less than 46.5gn Varget... that was a custom Broughton 5C 31" tube that did 2930-2940 with 45.2gn Varget. Then again, it had such a short throat that even *that* was a compressed load with the (old) S155MK.
Yes, 46+ gn can be a compressed load, especially with Lapua brass and Varget. Thats what they make drop-tubes for ;)
It's also what they make bushings for to tweak the neck tension so as to maintain seating depth :( 0.002-0.003 usually works well.
I've been working with some Winchester brass again lately (long story) and with the (very) short bearing surface of the newer generation bullets like the (new) S155MK Palma and B155.5BT Fullbore, even 48gn Varget is a) not compressed and b) not showing much in the way of pressure signs. 46+ gn is a fairly common load even with custom lapped barrels.
If it worries you, start @ 45gn and work up slowly. I still think you're going to find desired accuracy and speed at 46.5-46.8gn