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

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?

Originally Posted by L.R

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?

Please don't go there again with the pressure thing aye, it was thrashed out quite well here

http://www.nzhuntingandshooting.co.n...62/index2.html

I'm not trying to say that you are over loading or anything like that. You are free to load to any pressure you feel is safe. I'm just wondering how much more pressure it takes to get a projectile that is 25 gr heavier than the one I'm shooting at a higher velocity through the same barrel and action, and I'm not positive but I'm guessing a slightly Lower capacity cartrage.