I have found a supplier of 223 sierra matchking 52 gn heads (s1410) for almost a £10 cheaper than I can get locally

I'm currently using 53 gn sierra matchking (s1400) with 27.5 gn of CFE 223 in my sako 85 1-12 twist which are grouping quite nicely

thing is I cannot find any reloading data for the 52 gn bullet all the reloading info jumps from 50 gn to 53 has anyone used this 52 gn bullet and have any data/ powder weight for this must be CFE 223 .

the lowest powder weight for 53 gn is 27 gns of CFE max 28.6 ( I think without looking) was thinking of a starting point of 26.5 gn of CFE and working up to 27.5 same as 53 gn or will1 gn weight difference make to a low end 53 gn charge ?

these are for paper punching

thanks all