Hi Boyd:
Its a Douglas Premium,1-10,27" No.5 contour
In a Parker Hale, Mauser action. gj
Have tried sie 100gr MKs and sie 87 gr game kings. All with aa 4350, h-870, h380, h-414.
For 1000yrd loads.
All seated close to lands.
100s = 3/4-1" best H-870
87s = 5/8-1" best H-870
75 Vmax .363...