The Dtech 243 WSSM I just sold

, was the perfect coyote rifle for my situation. (S TX fur no good, rifle used for ADC and culling WT deer).
Mike suggested Varget w/the 87 gr. Hornady. I did a ladder test to check for pressure signs, starting @ 36.0 gr. up to max. listed in Hornady manual. Suggest you do same w/
your rifle to determine the optimum load.
The 87 gr. Hornady BTHP #2442 load suggested by Mike was the most accurate load I tested, see picture left below, hammers coyotes @ 3100 + fps mv. Using FC brass, 210 Fed. primers:
Wanting a heavier (wt./built) bullet, started w/ladder test of H450 behind 100 gr. Nosler solid base SP (Powder and bullets no longer available

)came up w/a 3000 fps mv load that shot same point of aim as the Hornady load, and deer are larger target

. Not quite the tack driver that the 87's were, but still a solid moa load. Used FC brass, 210 Fed. on these, as well. See target right above, shot same date, same sight setting as the 87 gr. load. ETA: 1" square paster for size comparison; don't recall measurements on groups.
I like the FC brass; it seems to size a bit easier than the WW. Never had to discard either FC or WW due to loose primers (probably due to working up w/ladder test, seeking accuracy, not velocity) or split necks.
Regards,
hm