Well , I guess I'll be devils advocate , I like Lapua brass and feel that after buying 200 pieces of Win brass to sort , uniform primer pockets , debure flash holes and annel case necks to end up with 100 cases equal to Lapua's seems like a lot of work and then their not going to last as long! I put a value on my time with everything I do and for me using winchester brass would cost me about $3 a case.
I have necked 30-06 Lapua brass down for a 6.5-06 and a
6mm-06 and only had to turn the necks on the 6mm-06. , I'm not saying that you won't with the 25-06 but if you do it will be very little and the only dissadvantage is that you took a little bit more time , but you cases will fit you chamber better thus improving accuracy.
Some will argue that using high quality brass in a factory gun is pointless , but I don't feel that way as I've seen a few factory rigs in the 25-06 shoot sub 1/2" consistantly. and like I mentioned before the Lapua brass last a long time.