Jaymaton,
The only Factory barrelled Magnum rifes I have worked on that will shoot anywhere close to my Custom Enfields were a Remington 700 and a Savage 110 both in 7 M/M Mag that were purchased as barrelled actions and glass bedded into custom stocks by me.
Yes, I like to experiment and tinker, that's why I have over 50 sets of reloading dies. I hand loaded and fired test groups for every rifle I worked on. From .222 Remington to .458 Winchester Mag.
The Enfield bolt will clear the lowest mounted scope and it is easy to remove the dog leg, cut off the bolt knob, heat and forge the handle straight, shove the hole in the knob up on the end of the bolt shank, weld in place and, grind and polish, it is easy to do this without over heating the bolt body itself, unlike when altering Mausers or Springfields,
Many of the Springfield bolts are so hard and brittle that you will break them when trying to forge them for a low scope, cut off and weld on a new handle is the best option here, this includes the 03A3's. Mausers forge for low scope with no problem, if you protect the bolt body and cocking cams from heat, but the resulting bolt handle is a little short in length.
The Enfield begs for a 30-06 or H&H length case due to it size and weight, My .308 Winchester rifle is short action small ring Mauser with a 22" Remington Barrel pulled of off a new 700 Action being turned into a Benchrest rifle, in a light weight fiberglass stock with a Lyman 3X scope with a crosshair and post. Point is if want a light rifle start with a smaller action, not an Enfield.