I have always been very upfront about the limitations these extreme performance rounds place on barrel life. I have used the best system I have found to extend barrel life as long as possible. These steps include using HEAVY bullets at high velocity instead of light to moderate weight bullets at hyper velocity.
Also, I had Dan Lilja tool up for special barrels, all with 3 groove rifling to offer as much resistance to throat erosion as possible.
Finally, I recommend using the very slow Ball burning powders which are much less abrasive as they pass through the throat as well as burning at a lower flame temp in the bore.
All these combined work together to offer very usible barrel life for a big game rifle which is the only use I have ever recommended the Allen Magnums be used for.
Richard Graves and I are also researching a system which may actually double barrel life!!! It is still in the planning/research and testing stage but if it works the way it is should in theory, not only will there be an increase in performance(velocity potential, unsure how much) but there will be a dramatic increase in barrel life.
From comparing similiar rounds, namely the 257 STW to the 257 Allen Mag, I have predicted that barrel life will be in the 1000-1200 round range, again this is for big game hunting accuracy at extended ranges, not being able to zip a P. dog at 800 yards on the 1200 round down the pipe so keep that in mind.
Barrel life is effected by so many variables that this is really just a guess, how the rifle is used, how it is cleaned, how hard you drive the ammo, all this will effect barrel life.
I rarely run my personal Allen Magnums to full tilt load levels. For example, I load my 257 AM with the 156 gr ULD RBBT to a hair over 3300 fps. If I wanted to I could break 3400 fps but if you run the numbers you will see why I have no problem dropping the load to 3300 fps and barrel and case life will be increased dramatically even with only a 100 fps drop in velocity.
My 270 AM I load the 169.5 gr ULD up to just short of 3300 fps. I am sure you have seen that BJ and Lerch are running 3400-3450 fps which is a top but comfortable load in their personal rifles. As you can see I am well off max but I can hit pretty much anything I want out to 1000 yards with this load so I think very little of the extra 100-150 fps.
If I had to GUESS what the barrel lifes will be with a properly cared for barrel, this is what I would say being conservative as always:
257 Allen Mag...........1000 rounds
270 Allen Mag...........1200 rounds
7mm Allen Mag...........1100 rounds
338 Allen Mag...........900-1000 rounds
With the experimenting we are currently doing, if the system proves to work as predicted, these round counts could possibly double!!!
No hints yet but its very interesting stuff. Just have to design a system that is practical for everyone to use!!
For everyone interested in an Allen round I have also just released two more rounds that I have named the 257 Allen Xpress(AX) and 6.5mm Allen Xpress(AX).
I am actually field testing the 6.5 AX as this is being written. The rifle is based on a stainless Ruger M77 MkII with a 26" Lilja barrel and factory Laminated wood stock.
Its current load is driving the 140 gr Partition to 3320 fps in a true standard length receiver. These new wildcats are not overly bore friendly either but compared to their big brothers, the Allen Magnums, they will offer much more bore life as still outperform most of the 257s and 6.5mm on the market and with the big Wildcat Bullets they will outperform everything except the Allen magnums.
I am going to test the 6.5mm AX on mule deer doe here as soon as the temps drop below 70 degrees here in Montana!!!
Reports to come soon.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
Temps above 70 degress in Montana, this time of year [img]/ubbthreads/images/graemlins/shocked.gif[/img]
Same here in SE Idaho [img]/ubbthreads/images/graemlins/confused.gif[/img] When you get your temp down could you put a word in for down here also.
Its a heck of a deal when the limiting condition on doing some terminal performance tests on those WC 252s is the warm days. Maybe I otta do the test using the neighbor's lamas, wouldn't care so much if that meat spoiled.. [img]/ubbthreads/images/graemlins/crazy.gif[/img]
Appreciate the bbl life guestimates. Sound quite reasonable.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Me and BJ are shooting our 270 AM's at 3400-3450 and I know this will probably cut down on our barrel life but i choose this load because I saw my 100yds group tighten up a decent amount when I went from 102 to 104gr of powder. I probably could have done the same thing by playing with the seating depth at 102gr but I am kind of impatient. [img]/ubbthreads/images/graemlins/grin.gif[/img]
So Kirby when are you gonna let us test this "new" system in the 270 AM. I sure as hell don't mind being a guiney pig for something this cool [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
take it easy
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