Is the stock standard?.......if so it's a Bell and Carlson, they have 'pips' in the barrel channel which apply pressure to the barrel........these rifles shoot better with these removed and the barrel floated.
If you can't get the 25g vmaxes to group when seating them out, try seating them further in (deeper) and you'll find the second sweet spot this calibre likes.
I've had quite a few LVSF models over the years and have always managed to make them work well.
Good luck,
chrono