The only donuts I experience are from Making 300 Win in 7 Mashburn Super, since some of the Wins shoulder becomes neck in the forming process. I use a K&M inside neck reamer and hit them pretty heavily and haven’t ever had one come back. Other than that, very little experience with it.
Do FLS...
If you don’t like the recoil of it, I’d either load some easier shooting stuff or maybe something like a 9.3x62 would be a better fit. Adding that much weight to but or about any rifle sounds like a horrible idea for balance as Don mentioned.
I sure like the looks of that myself Guy. I did similar and used an old 300 H&H barrel to make my 375. It’s plenty heavy as it is. Yours looks excellent.
I don’t think it’s affecting the action as much as we think. The case is holding the pressure as it grips chamber walls. I can’t see it being unsafe myself.
And less recoil since there is less powder being burned. Just my thoughts.
It’s similar to 17 just won’t get the same top speeds. I don’t think it matters too much though, the difference from 2900 to 3000 isn’t going to change any outcome I can think of.
I use a lot of scopes, from NF, Trijicon, Athlon, Arken, S&B, SWFA, Leupold, Zeiss, Signtron and probably a couple others I’m forgetting. My favorite western open country scope is my Trijicon 10 Mile 3-18. I have one on my Mashburn and one on a Montana 7 WSM. So far my favorite eastern deer...
I also have a little Kimber 338 Fed. Right now I use plain old Speer 200’s since it only been used for deer to this point but it’s a sleeper of a little cartridge. Seems easy to make good accurate ammo as well.
I’ve used Grand a bit in one of my 7 WSMs and my Mashburn. Seems like a great powder so far and I was liking it enough to grab an 8lber of it after trying it. It is nice in it seems to make about the same speeds as H1000 and is less money per pound which never hurts.