My advice is H1000 under a 200grn pill is great in a 300wby, not so much so in a 340wby, look at podwers in a little faster range, H4831, Imr4831, RE19, VV N160, Biggame, even Imr4350. H1000 is to slow for a 200grn pill, if you were shooting 265grn+ pills it would be fine.