Not getting decent grouping w Red Dot in an 03 Springfield based rifle w NOE 311291 sized and GC and Red Dot. Have tried 11.5 and 12.0 gr with equally poor results. This is a nice middle of the data range load...can't figure why it doesn't perform better.
Same bullet, same rifle etc will group 10 around 1.5-2 in. at 100 with 16-18 gr of 2400 and a 1 gr filler.
Also get good results with the same bullet unsized at about .312 w 11.5gr Red Dot in 7.62 54R in both a 91 30 and an SVD.
Scratching my head on what to try next, experience and suggestions welcome!