In this time of having to explore the limits of component availability your plan is a sound one. @akaroa1 and I are both running TC "single shot" Contenders in 6.8 SPC's (110's gns at about 2750 fps, Davids suppressed at 6lbs scoped, mine not and closer to 7 lbs scoped) and they have proven deadly with simple "cup and core" projectiles on a variety of game and in an extreme example, at fairly extended range - David shot a big red hind at 350M. Last weekend we shot pigs (172M and 125M) and several wallabies, all with emphatic kills.
I feel there isn't much need to shorten the barrel to extremes, these single shot's are already very compact with a 23" barrel unsuppressed and a 20" suppressed.
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