Kinda new to reloading rifle rounds. I loaded 10 rounds yesterday for my rem 700 300 RUM xcr. First time. The only powder I could find was Accurate Magpro. I loaded according to the speer manual for starting loads for 5 rounds then 1 grain more for 5 rounds. New Rem cases and cci large rifle mag 250 primers pushing Accubonds. COAL was 3.600 or a hair less. 8 of the 10 rounds misfired! The primer ignited but the powder did not. On the 2 that did fire there was a very short pause after pulling the trigger till it fired. The speer manual says it is common for starting loads to not fire when woring up to new loads. The powder should work I would think. Also, which might be the problem, is I resized the new cases and washed them in boiling hot water then set them out to dry. I primed most of them and noticed a drop of moisture in one so waited till this morning to continue loading. I did not put any powder in them till this morning but could that very small amount of moisture have caused the primers to not ignite enough? I did load a case with just a primer and it fired fine. Also at the range I fired aboutf 5 factory loads with no problems and the firing pin dented the primer just the same as my loads. Wish I could find some Retumbo and check it with that. Not real sure what the problem is but I did something wrong! Any help would be great! Thanks.