Scott, I am not doubting the velocities that Keith (and you) are recording, I was just querying how it was achieved.
I know that in the two 25/06 rifles that I have owned that I could not have got anywhere near those velocites at what I believe would be safe maximum pressures for my rifles.
The barrels on both my two 25/06 rifles were subsequently set back and rechambered to the 25/06AI, which resulted in a significant improvement in velocity (about 225 - 250 fps) over the standard 25/06 in the same barrel. The chrono results of the two rifles were:
Rifle 1: Sako AV 25/06 Hunter 24 inch CM barrel.
Nosler 100 grain BT
55.0 - IMR 4831 - 3220
56.0 - IMR 4831 - 3259 (Max)
56.0 - WIN 785 - 3298 (Max)
57.0 - WIN 785 - 3377 (Above Max) cases lasted 3 -4 shots.
58.0 - WIN 785 - 3418 (Above Max)
Nosler 120 SPBT
54.0 - H4831 - 2906
55.0 - H4331 - 2972 (Near Max)
54.0 - WIN 785 - 2975
55.0 - WIN 785 - 3075 (Max)
56.0 - WIN 785 - 3100 (Above Max)
55.0 - IMR 7828 - 2923
56.0 - IMR 7828 - 3040 (Max)
57.0 - IMR 7828 - 3100 (Above Max)
Rifle 1 Sako AV 25/06 AI Sako 24 inch CM Barrel
Nosler 100 grain BT
60.0 - IMR 4831 - 3519
60.5 - IMR 4831 - 3547 (Max)
61.0 - IMR 4831 - 3596 (Above Max)
62.0 - WIN 785 - 3514
63.0 - WIN 785 - 3556 (Max)
64.0 - WIN 785 - 3631 (Above Max)
Nosler 120 grain SPBT
58.0 - WIN 785 - 3269 (Max)
59.0 - WIN 785 - 3295 (Above Max)
60.0 - WIN 785 - 3377 (Above Max)
59.0 - IMR 7828 - 3267 (Max)
60.0 - IMR 7828 - 3325 (Above Max)
61.0 - IMR 7828 - 3401 (Above Max)
Rifle 2 Custom 25/06 Sako L61R, Shilen SS 24 inch barrel
Nosler 100 grain BT
57.0 - H4831sc - 3172
58.0 - H4831sc - 3232 (Max)
57.0 - Re 22 - 3252
58.0 - Re 22 - 3320 (Max)
57.0 - VihtN165 - 3205
58.0 - VihtN165 - 3255
59.0 - VihtN165 - 3342 (Max)
Rifle 2 25/06 AI Sako L61R, Shilen SS 24 inch barrel.
100 grain Nosler BT
60.0 - H4831sc - 3344
61.0 - H4831sc - 3435
62.0 - H4831sc - 3479 (Max)
63.0 - H4831sc - 3544 (Above Max)
58.0 - IMR 4831 - 3456
59.0 - IMR 4831 - 3523 (Max)
60.0 - IMR 4831 - 3599 (Above Max)
60.0 - VihtN560 - 3406
61.0 - VihtN560 - 3484
62.0 - VihtN560 - 3566 (Max)
60.0 - Re 22 - 3395
61.0 - Re 22 - 3501
62.0 - Re 22 - 3580 (Max)
62.0 - VihtN165 - 3499
63.0 - VihtN165 - 3562 (Max)
Nosler 115 BT
58.0 - IMR 7828 - 3281 (Max)
59.0 - IMR 7828 - 3290 (Above Max)
59.0 - Viht N165 - 3305 (Max)
61.0 - H1000 - 3157
62.0 - H1000 - 3222
63.0 - H1000 - 3271 (Max)
61.0 - Re 25 - 3218
62.0 - Re 25 - 3293 (Max)
62.0 Viht N170 - 3165
63.0 Viht N170 - 3202
64.0 Viht N170 - 3286 (Near Max)
I discovered in Rifle 1 when a 25/06 that when I attempted to achieve 3400 fps with the 100 grain bullet and over 3,100 with the 120 grain bullet the cases would only last 3 - 4 shots before the primer pockets were too loose to reuse. Similarly in this rifle in 25/06AI mode when I used load that achieved velocities of over 3,600 fps with the 100 and 3,300 with the 120 the cases would only last 3- 4 shots.
In Rifle 2, I quickly found that if I used loads that produced velocities in the 3300 to 3350 range for the 100 grain bullet that cases lasted 6 - 10 shots. Similarly in this rifle when in 25/06 AI mode, I have consciously tried to use more conservative loads than I used in Rifle 1. As a result the original 60 Remington case have fired about 500 shots and are still usable, despite working up loads to max with the 100, 115, 125, 130, 142, and 156 grain bullets.
I guess what this all confirms once again is that all rifles are different, and most people load to a pressure level to which they feel comfortable with. Regards, Brian.