Fiftydriver
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Derek M.
Johns wildcat is basically a 7mm STW with a custom accuracy throat very similiar to the one I use in my rifles. The 7mm STW will run in the 3400 fps range with a 150 gr bullet. I believe John used X bullets but can not say for 100%.
The 150 gr X bullet will have a B.C. in the .500 range. Compare that to the 169.5 gr ULD with its .750 BC and the ballistic difference is clear.
Barrel life of the two rounds will be within 150 rounds of each other I would guess, especially using the WC872 powder in the Allen Mag.
Out to 400-500 yards the ballistic difference will be very little, past that though the 270 Allen Mag will be maintain more velocity and it always has far more bullet energy at any range. Wind drift at extended ranges will favor the 270 Allen Mag as well simply because of the BC advantage.
IF you want to compare the same bullet in each rifle, the 270 Allen Mag will drive a 150 gr bullet to nearly 3600 fps with top loads.
Still for long to extreme range shooting and hunting, the 169.5 gr ULD is far superior to any conventional bullet design for the 270 or 7mm commercial bullets.
The 7mm Allen Mag is a totally different cat then the smaller Allen Mag rounds. It to can be chambered in the Rem 700 receiver but it is based on the much fatter 338 Lapua case with the Allen Magnum shoulder angle and body taper design.
These rifles will be on the test range by the end of the summer.
They will be more costly to build unless they are converted to single shot. A repeating model will be offered on the Rem 700 receiver using the H-S Precision Detachable Magazine system. This system alone adds roughly $200 to the rifle price.
Initial performance expectations are to drive the 200 gr ULD RBBT Wildcat Bullet to a solid 3200 fps. This bullet should produce a BC in the .950 range so ballistic potential will be far superior to even the 270 Allen Mag and vastly more then the 7mm RUM.
We are looking to add roughly 100 fps to the performance of the 7.21 Firebird from Lazzeroni with far better quality brass.
We are expecting to drive a 140 gr Accubond to +3800 fps possibly 3850 fps. Again the light weight bullets look impressive in velocity but it is the huge 200 gr ULD RBBT Wildcat that will make this round truely special.
Still it will not be as easy to use as the 270 Allen Mag simply from a case forming aspect. Also, the rifles will be more costly to build as well as a repeating rifle.
Good Shooting!!
Kirby Allen(50)
Johns wildcat is basically a 7mm STW with a custom accuracy throat very similiar to the one I use in my rifles. The 7mm STW will run in the 3400 fps range with a 150 gr bullet. I believe John used X bullets but can not say for 100%.
The 150 gr X bullet will have a B.C. in the .500 range. Compare that to the 169.5 gr ULD with its .750 BC and the ballistic difference is clear.
Barrel life of the two rounds will be within 150 rounds of each other I would guess, especially using the WC872 powder in the Allen Mag.
Out to 400-500 yards the ballistic difference will be very little, past that though the 270 Allen Mag will be maintain more velocity and it always has far more bullet energy at any range. Wind drift at extended ranges will favor the 270 Allen Mag as well simply because of the BC advantage.
IF you want to compare the same bullet in each rifle, the 270 Allen Mag will drive a 150 gr bullet to nearly 3600 fps with top loads.
Still for long to extreme range shooting and hunting, the 169.5 gr ULD is far superior to any conventional bullet design for the 270 or 7mm commercial bullets.
The 7mm Allen Mag is a totally different cat then the smaller Allen Mag rounds. It to can be chambered in the Rem 700 receiver but it is based on the much fatter 338 Lapua case with the Allen Magnum shoulder angle and body taper design.
These rifles will be on the test range by the end of the summer.
They will be more costly to build unless they are converted to single shot. A repeating model will be offered on the Rem 700 receiver using the H-S Precision Detachable Magazine system. This system alone adds roughly $200 to the rifle price.
Initial performance expectations are to drive the 200 gr ULD RBBT Wildcat Bullet to a solid 3200 fps. This bullet should produce a BC in the .950 range so ballistic potential will be far superior to even the 270 Allen Mag and vastly more then the 7mm RUM.
We are looking to add roughly 100 fps to the performance of the 7.21 Firebird from Lazzeroni with far better quality brass.
We are expecting to drive a 140 gr Accubond to +3800 fps possibly 3850 fps. Again the light weight bullets look impressive in velocity but it is the huge 200 gr ULD RBBT Wildcat that will make this round truely special.
Still it will not be as easy to use as the 270 Allen Mag simply from a case forming aspect. Also, the rifles will be more costly to build as well as a repeating rifle.
Good Shooting!!
Kirby Allen(50)
