Originally Posted by greggohrc
I have 130gr BST's for my Ruger M77 270 WIN and i have loaded them over 59gr's of 4831SC. This gun has been very accurate with anything I have loaded in it before but this is the first time I have used either this bullet or this powder. I am getting very erratic grouping. Do you think it is over loaded? Do I need to reduce the loading because of the short cut powder? Hodgdon says that 60 is max with regular 4831 but I was curios if the short cut packs better for a denser charge? 59gr should be 59gr right?? Any help would be great I have heard great things about this combo and would love to make it work for me.
If this is the only load you have tried, you clearly need to experiment. Be sure that whatever you do, you only change one thing at a time. This allows you the measure the effect of the change.
Is your current load overloaded? are you seeing any pressure signs? e.g. ejector marks on the case head, flattened primer, heavy bolt lift.
H4831SC is a good powder for the 270. A buddy of mine with a 270 had read that RL22 was the go-to powder for the 270. After much failed testing with RL22, he tried H4831SC and it was almost magic.