hi andy , am using a howa 1500 with varmit barrel , have got good grouping at 100 yards with winchester silver tips ( ballistics ) £36 a box also been using privi which are only £10 a box but they are only soft point not so good grouping but that shows in the price difference ,yea always keep the cases ,got no reloading manuals yet . i belive that both are 55g.