I dialed in the .270 for my nephew at 130 grains. He is taking my old .270 to North Dakota shooting prairie dogs. With 130 bullets, center book was a comfortable and nice group for the 40 year old glass and older eyes.
I couldn't find any more 130 but lucked into 200, 100 grain, the pd will not know the difference. Unless someone has data to say different I'm going to go center book +1 (51 grn, max 52) and call it good. I don't have time to run high low middle again. Middle was best on the last run for spitzer, top end was best with a boat tail, which surprised me. (44, 46, 48)
If you have data or experience, I'd be interested.
FYI the Dillon 550B threw about 140 measured .270 powder throws +/- .1, three were - .3.
tx
I couldn't find any more 130 but lucked into 200, 100 grain, the pd will not know the difference. Unless someone has data to say different I'm going to go center book +1 (51 grn, max 52) and call it good. I don't have time to run high low middle again. Middle was best on the last run for spitzer, top end was best with a boat tail, which surprised me. (44, 46, 48)
If you have data or experience, I'd be interested.
FYI the Dillon 550B threw about 140 measured .270 powder throws +/- .1, three were - .3.
tx