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Vash,
I suggest you stop by either the Snipers hide or 6.5 Grendel sites. Good technical help at both sites with little of the PARF flavor. I suspect both sites have better ballistic calculators than the one you are currently using.
Few scopes less than four figures actually match the listed click value. Need to check it first “dry” (w/o shooting), then while shooting groups in a box test. The former is relatively quick and easy but it will probably take a while with a .257 Weatherby letting the barrel cool between groups.
Most programs also specify scope height above bore, if you have an angled base and a bunch of other stuff to include atmospherics, altitude, location and direction of shot.
If your scope doesn’t track and you are going to replace I highly suggest you get one with both windage and elevation in the reticle and don’t mix units from reticle to adjustment; there are scopes that reticles in mils but adjust MOA or fractions of an inch/100 yards or meters. It’s much easier to use mil/mil or MOA/MOA.
My last suggestion is practice wind reading as that’s much more difficult than range/drop.
S/F, FOG
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