Re: Sierra\'s 7 RUM load suggestions
Don't wanna get too technical here because I don't think it is overly useful out in the field. But, large masses are less affected by changes in temperature than smaller masses. In other words, it is possible that a heavy (high mass) load could be less affected by temperature than another. I think it was Nosler that recommended that the best groups typically occur somewhere around 80% case capacity. That volume is what probably affects burn rate more than the mass(weight) of the load.
Bottom line, as you pointed out, what difference does it make when you find a load that shoots itty bitty holes in the paper. Other things come into play like air-powder volume ratio, primer type, etc. etc. but I try to focus on the steak instead of the peas!
By practicing a lot (different days, different temperatures, different ranges, elevations, positions, ad finitum) I usually iron out any concerns.