With hunting season approaching I worked up some 150 BT .30-06 loads for a friends Remington 710. Following my Lyman manual it stopped a grain short of their max with IMR 4064(52.0 grs was my load). The 710 sports a 22" bbl and yielded the following chrono data:
1: 2784
2: 2804
3: 2803
4: 2803
5: 2789
AV: 2797 fps
ES: 20 fps
(no sky screens and overcast, 50 degrees/damp)
Now today was my day off so I figured Id load some 150 bt's for my Montana 1999 with a 25 1/4" bbl. I worked up to the same load with ease and chrono'd the last two rounds I had in my box.
1: 3245
2: 3260
My chrono is a basic chrony F1 that has always giving accurate reading, I checked it today with some rounds that were confirmed by a friends Oehler. I'm surprised by this difference as I wouldn't have beleaved it and still dont beleave that 3.25" difference in barrels would create a 450 fps discrepancy.
1: 2784
2: 2804
3: 2803
4: 2803
5: 2789
AV: 2797 fps
ES: 20 fps
(no sky screens and overcast, 50 degrees/damp)
Now today was my day off so I figured Id load some 150 bt's for my Montana 1999 with a 25 1/4" bbl. I worked up to the same load with ease and chrono'd the last two rounds I had in my box.
1: 3245
2: 3260
My chrono is a basic chrony F1 that has always giving accurate reading, I checked it today with some rounds that were confirmed by a friends Oehler. I'm surprised by this difference as I wouldn't have beleaved it and still dont beleave that 3.25" difference in barrels would create a 450 fps discrepancy.