@kotuku and @Mickey Duck,
Yes, no point being in denial that the No 4 is just no 1200-metre sniper's dream but a more rough tool, a semi-auto bolt action at best.
In the book dealing with WW1 snipers, "Sniping in France" (creepy title - sounds like a holiday memoir!), the author points out that main factor was age of barrel. Over 600 shots the SMLE's accuracy deteriorated. I guess fibreglass bedding would not help that.
Meanwhile, it is fun to tinker and dream of what may never become reality and to play with different kinds of ammo. The groups will get smaller, but there has to be a point of diminishing returns, and it's not at 0.5 MOA.
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