Re: starting loads for 300 rum
Stx, This is what I have had pretty good sucess with in my 300 Rum all fired at 300yds in a stock 26" Sendaro barrel.
185 Berger VLD 97gr. H-1000 = 3400fps / 1 ragged hole
200 Nosler AB. 91.5gr. RL-25 = 3260fps / 1 ragged hole
210 Berger VLD 91.5gr. H-1000 = 3020fps / 1 ragged hole
210 Berger VLD 94gr. Retumbo = 3100fps / 1 ragged hole
220 Sierra MK. 91.2 Retumbo = 3000fps / 1" groups
RL-25 gave outstanding numbers 3263,3267,3261 with the 200AB, however this powder in this caliber is super temp sensitive down here next to sea level where we are. If you go with this powder then I recommend that you work the load up in the middle of August.
Hope this helps.