Thread: Keeping the 7mm ahead of the 30 cal?

Originally Posted by Kiwi Greg

Ha Ha Ha was waiting for that

Thats why I said shooting at rocks.

I only shot at it 5 or 6 times, got a 3 shot group 2ish moa group, 2380 is a fair way away

Shot a 1 moa 3 shot group at 1700, 2 of those were with in 1/2 moa third one dropped out, low left.

Looking forward to tuning the bullets a bit more & maybe a little more speed, these are still supersonic beyond 3000 now

Old thread I know, but Greg I'm curious what bullet at what velocity were you using to be supersonic at 3000?
My Lunatic is miles away from being supersonic at 3000 with 400CE's.

Originally Posted by L.R

Old thread I know, but Greg I'm curious what bullet at what velocity were you using to be supersonic at 3000?
My Lunatic is miles away from being supersonic at 3000 with 400CE's.

I used CEs BCs & they seemed to work out fine for me with the 375 Terminator.
Time will tell if they still work with the 375 DCM, should do as it is pushing them about 200fps faster.
I guess it comes down to how fast you can sensibly push them or how fast you want to push them.

How fast we're you pushing them with the terminator? Even at 1.0 G1 they need to be going very fast.

That was how I worked it out with JBM at the time, not sure on the altitude I used.
I was launching them 2920-30, I have a new reamer on the water so that may change.

Have you got your 375 back yet ?

Yeah in my program they need to start over 3200 fps with a BC of 1.0 to reach 3000 supersonic. My full size cheytac can't get anywhere near supersonic at 3000 at NZ altitudes. That's using a 400 CE with a G7 of .453 at 3035fps.

I guess it depends on the BC & speed you choose to use.
So far I have got highers speeds with the 400s & my 425s with more to come, out of our 375/408 imp-375 DCM.
It doesn't really matter how fast it goes, it matters how accurate it is because accuracy will always be King followed by BC & speed.

Yes being supersonic at 3000 sure does depend on the BC and speed you use. Both have to be a lot higher than we will be able to achieve at present with CE bullets and the cheytac case. Tell me what pressure are you at with the 425 exceeding 3035?