Hi all, This is my 1st post here (1st post on any hunting/firearms site honestly). Out of the gate, i'd like to mention that i'm not a complete NEWB who's seen too much Hollywood or read too many hunting magazines. I started shooting when i was 6, 'bout 4 decades ago, and competetively for a number of years when i served under Pres. Ronald Reagan and lived in Fayetteville, NC - go Red Falcons!!!! I know long-distance marksmanship is a life-style commitment and i shot simply for the joy of it (as well as prep for hunting season - whitetails were nice, interactive targets as well as good food!). Anyway, i've had about a 12-year break from hunting and shooting and am thinking about putting together another long-range rig. I had a Rem 700 chambered in .300 Win Mag, 24" semi-custom full-bull bbl, Brown Precision stock, Mark IV Ultra 10x optic, Shilen 2-ounce trigger plus the "stock" trigger i honed and adjusted to 1.5lbs (yup, did a bit of 'smithing in there). It was a serious shooter. With Winchester brass, 71.2 grns of Reloader 22 (i think - it's been a long time), 190gr Sierra MK's, and CCI Mag primers it would hold 5 shots in a nice little cluster avg. .225" at 100yds. Fortunately/unfortunately, i had a significant change in the trajectory of my life (tactical, professional, civilian 'marksmanship' came off the vocational table) and sold it before i got to see what it'd do at 1k and out. So here i am today considering putting together another LR rig - strictly for hunting. I plan on using it for North American game up to elk. For larger species (or larger bears), i'll consider something with greater mass (.375 and up). I have a donor action (my high-school graduation present - a Remington 700 ADL chambered in 7mm Rem Mag). I'm thinking to screw on a Lilja 416 SS 26" bbl (fluted w/ Sendaro contour), adding a Timney or Jewell trigger (still have the 2 ounce Shilen too) and putting it in a MacMillan A2 or A3 stock. I am undecided (but not too concerned) about which optic, though will likely use a Picatinny rail and detachable rings/mounts. My dilemma is this: Do i go with the tried-n-true .300 Win Mag (which i have a couple thousand rounds of experience with) or the wicked-hot .300 Remington Ultra? There are a few questions for me sort out as well. Q1 - will the .300 RUM even fit in my donor action? Q2 - will the .300 RUM be a barrell-burning monster? Q3 - is the .300 RUM recoil that much more punishing than the .300 Win? Only i know this....though i'm reasonably OK with recoil, i don't wanna rock my fillings loose either... Again, the plan is to use it for North American game up to elk - at "long" distances (as in i'd love to do some elk hunting 'out West'). I'm considering only the .300 Win or the .300 Rem Ultra. Thanks!!!!