There is loading data in the Woodleigh manual for their 275 and 310gr bullets:
275 Weldcore PPSN
H4895 Start 48gr @ 2088fps & Max 53gr @ 2320fps
Varget Start 50gr @ 2142fps & Max 53gr @ 2305fps
R15 Start 52gr @ 2145fps & Max 57gr @ 2345fps
N140 Start 51gr @ 2140fps & Max 55gr @ 2310fps
310 Weldcore RNSN
Varget Start 46gr @ 1868fps & Max 52gr @ 2135fps
H4350 Start 51gr @ 1880fps & Max 59gr @ 2200fps
R15 Start 46gr @ 1897fps & Max 53gr @ 2140fps
R17 Start 51gr @ 1890fps & Max 58gr @ 2215fps
N540 Start 48.5 @ 2020fps & Max 53gr @ 2200fps
N550 Start 51.5 @ 2030fps & Max 56gr @ 2210fps
