DNR;
My 25-06 is a Ruger Hawkeye it has a 24 inch barrel and a 1-10 twist.
Mine has shown no
perceptable difference in the grouping
patterns of different weight bullets that I can see. I have shot 120gr ( Remington and Winchester XP ) 117gr ( Hornady and Federal) 100gr ( Federal and handloads ) and 85gr ( Winchester). Some of these only at paper, but again all weights grouped well. Some a little better than others, but the Brand of ammo was the difference there.
Obviously there are different trajectories with different weights , but the grouping patterns have all been consistant so long as the shooters does his job. ( and trust me I need all the help I can get
)
I have
only shot the 117grainers at Whitetails, but have found the Hornady Custom SST and the Federal Sierra Gamekings BTSP both to drop Bambi where he was hit.
I have a friend who uses Federal loaded with 100gr Barnes TSX's with great results on Whitetails.
I wish I could help you with your question about 75 gr , but I have never shot any, or seen any in a 25-06 for that matter ; but if I could find them on the shelf somewhere I'm sure curiousity would get the best of me
and I would have to try them.
Hope some of this helps,....Tentwing