Thread: 450 Bushmaster

I have been doing a bit more testing/development with the 450 Bushmaster, while I still have the Tikka & I'm waiting for my Kimber to be finished.

Here is a target showing the drop & groups at 50yards between the 250 Factory load & subs, including initial velocity testing of the Lehigh 170.



Here is another I shot today testing the 170 Lehighs at subsonic speeds.
Some times funny thing happen Subsonic with some loads also sometimes the case doesn't always seal that well, letting a bit of gas past the case & down the bolt

Less of an issue if you bring the speed up a little.



I put some 170 Lehighs subsonic loads & some factory 250 ftx loads into the 44 gallon water drum, the 250s really made things jump around



They both opened up well, it is a pretty hard test on the projectiles, but its great to see what another 1100 fps did to Factory 250 FTXs.

I loaded up some of the 250 Ftxs today, the factory velocity is around 2025, they are loaded for the AR15s so probably not going that hard.

I managed to get put 200 fps on that speed with the 12" barrel happily giving 2200-2225fps, the projectiles I found in the mound were well expanded

So they look like they will be a great supersonic load.

This makes the 450 Bushmaster the ultimate bush rifle, short & light with tons of grunt, either super or subsonic

Originally Posted by Kiwi Greg

I have been doing a bit more testing/development with the 450 Bushmaster, while I still have the Tikka & I'm waiting for my Kimber to be finished.

Here is a target showing the drop & groups at 50yards between the 250 Factory load & subs, including initial velocity testing of the Lehigh 170.



Here is another I shot today testing the 170 Lehighs at subsonic speeds.
Some times funny thing happen Subsonic with some loads also sometimes the case doesn't always seal that well, letting a bit of gas past the case & down the bolt

Less of an issue if you bring the speed up a little.



I put some 170 Lehighs subsonic loads & some factory 250 ftx loads into the 44 gallon water drum, the 250s really made things jump around



They both opened up well, it is a pretty hard test on the projectiles, but its great to see what another 1100 fps did to Factory 250 FTXs.

I loaded up some of the 250 Ftxs today, the factory velocity is around 2025, they are loaded for the AR15s so probably not going that hard.

I managed to get put 200 fps on that speed with the 12" barrel happily giving 2200-2225fps, the projectiles I found in the mound were well expanded

So they look like they will be a great supersonic load.

This makes the 450 Bushmaster the ultimate bush rifle, short & light with tons of grunt, either super or subsonic

Was doing a bit with the 140gn FTX in .357 have side lined that for now to I sort out the .223 problem.
Anyway your post reminded me I need to get back into it.
Was only using the red dot as I was working on load and pressure as you will see in the pic, still to hot Alliant 2400 is the powder I am paying with.
Also the twist rate is not helping in the Rossi.
KH