ouch how many times did you have to reload or switch weapons part way through your kill? loaaads, thats where casket mags comes in, but also maybe high power ammo would finish them at longer ranges too

you tend to be engaging at middle to long distance, letting them come to you rather than rushing into in-ya-face confrontations, so thats where the stand off barrel comes in, giving you 18s up to 55, rather than 13s after 35

high power ammo would also give you 18s over 35, high power + stand off would give you 21s up to 55, 18s after that, but caskets add on 66% more ammo per clip, but then 13 to 18 is 72% more shot power, so IF you can hit with every shot the high power ammo has the edge there, until you start missing a few then its caskets

last shot wastage is 30% on 8 to kill a full health soldier (3.8% of the bullet count for the kill) or 44% LSW on 6 (7.4% of the kill), so caskets are a little more conservative with the ammo, even tho you use more to take them down

however caskets*standard long power (2080) comes out to 17% more long range kill power by pure numbers (less 3.8% wastage) than high power*standard loadout (1728) less 7.4% wastage, edge to caskets there.

so stabilised + high power or caskets (depending on how accurate you can be) + stand off