Case Capacities:
30-06 - - - 68.2 gr
30 Gibbs - 71.12 gr
3 gr of powder... I have better use for my money and time.
I appreciate the Gibbs as a theoretical concept but I like the 30-06 more, it always does everything I need a rifle to do.
If you're impressed with the 30 Gibbs my 300 WM will absolutely blow your mind...!
It's unclear where your numbers come from. I have a 30-06 Ackley & here are the weights I got with fired brass filled with water to the base of the neck at the shoulder junction. The #s are the water weight. Gibbs will be more of an increase, so your 71.12 may be right.
Sorry it's all different makes of brass but that's what's in my notes.
W-W standard 30-06.......... 55.6 gr
R-P 30-06 Imp.................... 63.3 gr
Federal 30-06 Imp.............. 62.7 gr
R-P 300 H&H .................... 81.7 gr
I got my Ackley in late 1990. It wears a 26" Douglas barrel. My Oehler 33 says I'm getting over 3300 fps with 150s, just under 3200 with 165s, & just over 3000 with 180s, all with good accuracy. It's warm but not excessive with my components in my rifle. Just this year I fireformed some new brass for this rifle due to some necks finally splitting. The old brass still works after quite a few firings but is tired after 30 years. Primer pockets still hold primers. Not bad for an 06 case burning under 65 gr of IMR-4350 & more recently some RL-17. Gibbs should do a bit more.
