s@b brass, hornady 140-grain spire point, cci 200 primer, h414, OAL 76 mm, which is 1mm shorter than previous attempts. 100 yards off sand bag. light breeze. temperature about 70 degrees F.
two groups of three shots over 41.5 grs of h414 went 1.24" and 1.361," both nice triangles. easy extraction, primers perfectly normal looking except 1 slightly cratered one. i think this and the other very slightly cratered primers were more of a function of the notoriously shallow s@b primer pockets than of pressure.
three rounds over 42.0 went 1.486," nice triangle, primers fine, extraction not quite slick.
three rounds over 42.5 went 1.361," nice triangle, slight cratering in two of three primers, but no flattening, extraction a tad stiff.
three rounds over 43.0 went 1.111," almost straight diagonal line running southeast to northwest. i suspect i just threw one. slight cratering in two of three primers, but no flattening, extraction a tad stiff.
because of the slightly stiff extraction at 43.0, i did not go on with strings over 43.5 and 44.0.
hmmmm ... the rifle with its tinhorn $25 tasco 4x has thrown every handload with h414 and imr 4831 so far into sub 1.5." i reckon i'll keep plugging.