The only rifle I actually regret ruining was a 1988 Mod 700 Classic in 35 Whelen ( I had it reamed to the Ackley Improved)
I bought it used in 1995, looking for a rifle to take to South Africa for Plains Game. I had wanted one since they came out, but this was the first one I saw up til that time, in any condition. I had been reading about Gary Sitton's use of the 35 Whelen Ackley and I sent the rifle off to Gary Stiles to rechamber. I had a local smith put a Decelerator Pad on and adjust the trigger lighter. I had a Leupold 1.5x5 on it, fire formed 100 new 35 W. Remington brass with the 220 Speer/amd a warm load of 4895 ( I had some on hand) I shot 20rds a week, followed by 100rds of 22 magnum rifle at a 6 inch bull 100yds. I used all hunting positions after zero. I then worked up a load (starting with standard Whelen data from the Barnes #1 Manual ( it was Black) with the Barnes 250X/2015br for right at 2600fps. I could go a lot faster but it shot bugholes at this speed. I zeroed it +1" @ 100.
I killed Blue wildebeest, Red hartebeest, zebra, gemsbuck and Kudu with it. I used my Afrikaner friends 300WM/180 XBT on Blesbuck, Impala, and his 375 H&H/270X on a Warthog. ( We were having fun!) Fast Forward....
My Afrikaner friend ( and PH/Outfitter I used, all a DIY hunt) felt he could get me a cull Buffalo Hunt later on. At the time, I was working with some Afrikaner Pastors Training Mission work and we would hunt three days at the end of two weeks there. He arranged to sell the meat and put toward the animal fees, which made my price ( out of my own pocket, not the Church!) far less than a guided elk hunt ( this was 1996.) So I came home, did some research and to "make do", save money you know, had this very fine Classic converted to Magnum and a 20" long Douglas chambered in .416 Taylor ( 458WM simply necked down) It had a "KDF" style muzzlebrake. OMG! It was the "loudest" rifle I have "ever" shot ( and I had shot a 416 Wby a guy had!) kicked all up in your face ( very light rifle) 400gr going 2350fps! Wow! I immediately sold that thing off for a Remington 700 BDL SS .375 H&H. The buffalo hunt fell through anyhow! I moved on, but gave that .375 to a young man ( who went with me in 2002) but went back in 1998 with, get this a 5 1/2 lb (before scope unloaded) 340Wby/210 XBT. It kicked the guts out of a 2.5x8 Leupold right before my trip, so I put a 3x9 Zeiss on it. It starting killing that scope upon arrival/checking zero. Before it went south I managed to kill a zebra and an Impala before I wounded a Blessbuck ( finished him with a 300WM/180xbt) and shot the foot off a big Namibian Gemsbuck ( My friend killed him, but I had to pay for him!) Upon returning home, I had it rebarreled to a bit heavier barrel and Mag Na Ported (the 340Wby also had come with a KDF style on it, super loud!) in 338WM and set it up with the Barnes 185XLC and another 2.5x8.
In 1999, I bought another 1988 Classic 35 Whelan, ( which had a tad thicker , more squarish wrist, why I don't know. First one was slim and more rounded, perfect!) had my local smith rechamber it to Ackley, put another 1.5x5 on it and worked up a load with the 200X to 2970fps. I took it with me my last trip, 2002 and shot a zebra (250yds) and a Black Wildebeest ( 347yds)
I felt that out to 350yds, it shot as flat as a 300WM and up closer, it killed like a 338WM, 340Wby and the 375H&H. Some will disagree with me, but that "very first Whelen" (Ackley) was one I keep trying to reproduce, ha. "Make do won't do"...trust me.
WARNING: I later had the specs of those loads I hunted with in the 35 WAI put in QuickLoads Program. According to it I was in the 72-74K pressure range! I always used new, formed brass for my loads, never used it again after a kill. But while they "had rounded primers and easy bolt lift", they were "hot"! I only have one good eye (my shooting eye at that) so I quit the wildcats. It seems "you can't look a chicken in the face and tell how fat it is" with Ackley's, ha.