i am going to buy a 3.5 kilo tub of vit powder to use to load ammo for .243 70 to 90gr/ 6.5x55 100 to 140gr/ 308 110 to 168gr trying to get one powder to use for all these calibers. i use n140 /n150/n550/n560 at the moment but i am almost out so want to get the 3.5 kilo as it works out a lot cheaper than buying 1 kilo tubs.need advice as to which of vit powders to buy.best price i have found is £230 3.5 kilo so £65.70 per kilo.reloading solutions want £87.95 a kilo. i am leaning towards the n150 as middle of the range and appears to suit all i load but any advice happily recieved.