Re: 6.5 140vld at 3300-3400fps???? need help
My wifes 6.5mm Allen Magnum has around 500 rounds down the barrel and it still is a 1/2 moa rifle pretty easily. IT is not shot alot, it is not over heated, three round strings at a time max. 142 gr SMK at 3550 fps. THis is on a necked down 338 RUM with improved shoulder and body design.
3500 fps from a necked down 7mm Dakota, you are running that very hot to get that level of velocity with a 140 gr. I find this very questionable. My 257 Allen Xpress and 6.5mm Allen Xpress are both based on the 300 Dakota which has larger capacity then the 7mm Dakota and best I can get out of the 6.5 with 140 gr bullet weights is 3300-3350 fps with acceptable case life.
Have also tested the 140 gr Berger VLD Match bullets in 6.5-06 AI, 6.5mm WSM, 264 WM, 6.5mm STW, 6.5mm AX, 6.5mm RUM and my 6.5mm Allen Magnum and in barrel twists from 1-8 (3,4,5 and 6 groove), 1-9 (3 and 6 groove) and 1-10 ( 6 groove) and in with the 1-8 twist barrels, the Berger bullets let loose at 3200-3250 fps in every barrel tested. Including Lilja, Pac Nor, Broughton, Hart, Krieger and Rock........
1000 round down the barrel and you still have a 1/2" rifle at these pressures......
5" group at 700 yards out of your truck window.......
WOW!!! Don't know where to start here. IF you said you were shooting the 142 gr SMK I would believe it as they will survive any velocity you can drive them to, the 140 gr VLD..... I would have to see that to beleive it because I have probably dusted 3 lbs of 140 gr bergers in my ballistic testing.
Sorry, but every thing you have stated goes right in the face of nearly everything I have tested in ballistic performance.
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