crazysccrmd
Member
I finally got around to buying a chronograph (Chrony F1 Master) and took it out to the range this morning. I shot some 22lr over it to check it out since that was the only factory ammo I had. The Winchester bulk pack is labeled at 1280fps and gave me a five shot average of 1203fps, at 71° and 44% humidity according to my phone.
All the 5.56 loads were with LC brass, Tula SRM primers and at 2.26" length. I used a Lyman powder drop and can tell it doesn't give consistent drops using stick powders. I fired five rounds for each barrel length.
IMR 4064, 25gr
16" 2779fps, SD 39, ES 98
10.5" 2518fps, SD 19, ES 48
IMR 8208XBR, 24.5gr
16" 2746fps, SD 46, ES 121
10.5" 2443fps, SD 51, ES 111
H4895, 25gr
16" 2908fps, SD 68, ES 142
10.5" 2531fps, SD 27, ES 66
For my two main hunting rifles I hand measure each load on an electric scale and they were much more consistent.
8x57, 17" barrel
150gr Hornady SP, 50gr H4895, 2632fps, SD 17, ES 30
175gr Sierra SP, 48gr H4895, 2413fps, SD 9, ES 16
250 Savage, 22" barrel
100gr Nosler BT, 35gr H4895, 3009fps, SD 11, ES 21
100gr Partition, 34gr H4895, 2895fps, SD 7, ES 14
Having this ability to see my actual velocities is awesome. Using an online estimator for velocity put both my 8x57 loads a little over 100fps faster even after compensating for the reduced barrel length.
All the 5.56 loads were with LC brass, Tula SRM primers and at 2.26" length. I used a Lyman powder drop and can tell it doesn't give consistent drops using stick powders. I fired five rounds for each barrel length.
IMR 4064, 25gr
16" 2779fps, SD 39, ES 98
10.5" 2518fps, SD 19, ES 48
IMR 8208XBR, 24.5gr
16" 2746fps, SD 46, ES 121
10.5" 2443fps, SD 51, ES 111
H4895, 25gr
16" 2908fps, SD 68, ES 142
10.5" 2531fps, SD 27, ES 66
For my two main hunting rifles I hand measure each load on an electric scale and they were much more consistent.
8x57, 17" barrel
150gr Hornady SP, 50gr H4895, 2632fps, SD 17, ES 30
175gr Sierra SP, 48gr H4895, 2413fps, SD 9, ES 16
250 Savage, 22" barrel
100gr Nosler BT, 35gr H4895, 3009fps, SD 11, ES 21
100gr Partition, 34gr H4895, 2895fps, SD 7, ES 14
Having this ability to see my actual velocities is awesome. Using an online estimator for velocity put both my 8x57 loads a little over 100fps faster even after compensating for the reduced barrel length.