TackDriver284
Handloader
- Feb 13, 2016
- 2,559
- 2,139
Continued fireforming Lapua brass, worked up charges in .4 increments to find max pressure / velocity. Recent highest work up was at 50.5 grains at 2717 fps average in recent post.
H4831SC, virgin Lapua brass, full sized bushing, .263" mandrel, BR2 primer, 147 ELD-M
50.6 grains - 2735, 2733, 2733
51.0 grains - 2743, 2752, 2740
51.4 grains - 2761, 2757, 2755
51.8 grains - 2785, 2779, 2800
52.2 grains - 2792, 2803, 2817
52.6 grains - 2811, 2827, 2817 ( slight ejector mark on 2 cases )
53.0 grains - 2850, 2860, 2861 ( defined ejector mark on 3 cases )
50.6 grains at 2733 fps average printed a nice one hole group, after fireforming it it may change
51.4 grains at 2758 fps average printed , again, a nice one hole group
51.4 - 52.4 grains will be the next loads to pick to tweak it up ( once fired brass ) As Jimbires mentioned, once fireformed it may increase speed hopefully. 2800 fps is a nice speed with the 147's with H4831SC. 50.6 grains is nice with that 1 hole group, but a tad slow.
H4831SC, virgin Lapua brass, full sized bushing, .263" mandrel, BR2 primer, 147 ELD-M
50.6 grains - 2735, 2733, 2733
51.0 grains - 2743, 2752, 2740
51.4 grains - 2761, 2757, 2755
51.8 grains - 2785, 2779, 2800
52.2 grains - 2792, 2803, 2817
52.6 grains - 2811, 2827, 2817 ( slight ejector mark on 2 cases )
53.0 grains - 2850, 2860, 2861 ( defined ejector mark on 3 cases )
50.6 grains at 2733 fps average printed a nice one hole group, after fireforming it it may change
51.4 grains at 2758 fps average printed , again, a nice one hole group
51.4 - 52.4 grains will be the next loads to pick to tweak it up ( once fired brass ) As Jimbires mentioned, once fireformed it may increase speed hopefully. 2800 fps is a nice speed with the 147's with H4831SC. 50.6 grains is nice with that 1 hole group, but a tad slow.