I get 3,250fps shooting the 125 Wildcat & RL25 with my AI which is a Sendero that Kirby did for me. I don't know of course if you have a "slow or fast" tube, but with retumbo or RL25 you should get around 3,300 or so. Your mileage may vary & of course work up slowly.
You will not make peace with the Blue Coats, you are free to go.
A faster twist will rob you of FPS. My 30-338 has a 12 inch twist and it shoots exceptionally fast. A nosler 150gr BT @ 3573fps. A 10 twist would slow it down and preasures would go up. Talk to Shilen about what you expect from the barrel. If you want top RPM (speed) from heavier bullets talk to the Shilen techs and see what they recommend for twist. The AI tells me your looking for speed. My son still shoots his 25-06 AI W/Shillen 1-10 barrel. I don't know the loads off hand. I remember it was a bunch of work to keep up with it. Good Luck, Olcrip
A 26 inch barrel should enable you to get 3300 fps with the 115 grain bullet, as my Shilen 24 inch 10 twist barrel achieves 3270 - 3290 with the Nosler 115 BT depending on the powder and temperature.
I found that maximum loads of Hodgdon 1000, Reloader 25, and Vihtavouri N170 gave good load density, accuracy, and velocity. I have listed my maximum loads to give you some idea, but chambers seem to vary a lot so start at least 5 grains below and then work up.
115 Nosler BT
58.0 IMR 7828 - 3281 (Max)
61.0 Re 25 - 3218
62.0 Re 25 - 3293 (Max)
62.0 H1000 - 3208
63.0 H1000 - 3271 (Max)
63.0 N170 - 3202
64.0 N170 - 3286 (Near Max, slightly compressed load)
I believe your decision to use a 9 twist is a good one, as it gives you the option of using bullets up to about 135 grains in weight.(depending on length). I read on another forum that Berger were planning on releasing a 125 grain VLD later this year. I hope the report is true.
My 10 twist gives excellent accuracy with the 130 grain Wildcat BCFBHP, but when I rebarrel I would go with either an 8 or 9 twist depending on what bullet weights were available at the time. Hope the above is of some help. Brian.
I'm with you on that Brian, I really wished bigger bullets would be mass produced. I look forward to Berger releasing them.
I have an A.I, but plan on doing some things different. #1 going with bigger bullets, and slower powder. Also using some beefier cases so I can get the velocity this case has to offer. I will try some sorted Winchester brass that I have laying around, it should help me with the velocity.
When it comes to rebarrel I will definetly consider an 1-8 or 9" barrel. With a longer throat than I have now.
I have really enjoyed this cartridge, and its accuracy.
Berger is not going to build a 125gr bullet if it won't stabilize in a 1-10 twist -their market would be next to none existent if the bullet needed a '' highly rare '' twist..
Baring surface of the bullet is more of a factor than weight.
I have read of plain 25-06's shooting the 130 wildcats .
Long live the 25 caliber , i'll AI mine soonish..
AIPAC for president !!!!!!!!!!!!!!!!!!!