Having reviewed your results again, they are very impressive, your 1416 would be able to do the 1/2" 5x5 shot groups at 50 pretty comfortably with the SM match I'd think, and I know too well how difficult it is, haven't succeeded yet myself or even come close really.
Its a bit academic but to shoot consistent small groups I feel one needs at least 4 factors under control 1. the ability to maintain discipline to shoot group after group with the same precision, 2. an accurate rifle, 3. Ammo that the rifle "likes" and I think the most difficult, 4. that the ammo the rifle likes is consistent.
I've shot the smallest groups with Eley Club, and can repeat them about 2 out of 5 groups, but the other three always blow out. Eley Match doesn't produce the smallest groups in my 1415-1416, but they are pretty good and they are consistent. Hopefully some RWS becomes available in due course, it would be interesting to see if my Annie likes the SM as much as yours.
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