Re: 243 Win. 85 gr. or 100 gr.
For me there is no question all when hunting deer is in the equation. Go with a 100gr bullet.
My personal choice is a Sierra 100gr SBT pushed to 3000 fps out of my Ruger #1 chambered in 6mm Rem (26"bbl).
My brother's daughter once took down a nice 3pt mule deer at 285 yds using a 18"bbl'd Rem M600 in 6mm Rem. He has had outstanding results using Rem 100gr PSP core-loc factory load, so much so that he does not bother to reload for the rifle.
Ashley is a great shot and she loves that beat up old 6mm. We have tried to get her to upgrade to a 257 WBY and she refuses to switch rifles. I even offer to paint the vangaurd's stock pink. She declined and responded, "how about painting the stock of the Mohawk?"
That girl is hell on wheels (for mulies) with that 6mm Rem and 100gr Rem factory loads.
Snohomish Co. Washington
NRA Life Member