This is probably a site best visited in autumn, winter or spring. The stones are awfully wee, and were being dwarfed by the grass growing around them today. Access is via a farm track (no vehicles) and the stones are high up, so wet ground shouldn’t be a problem.
Although the mound on which the stones sit is was excavated in 1894 and reported to be a natural morain deposit, it does look very suspicious, and there are stones on the east side of it which could be the remnants of a kerb.