Thread: .375 GSC VS 425 CEB at 2050 yards.

I finally got some GS Customs .375 414 SP projectiles to try out in the 375 DCM.
On Saturday I loaded some up with RL50 & went to the range to try to match the speed to my CEB 425 load.
The only one I fired went through the Oehler at 3170 fps a little faster than I wanted so I went back, pulled them, reloaded 6 more dropping the powder back by three grains & worked up.
This was the group they shot at 100 yards, things looked promising & I got my target speed of approx 3140 fps
It is 1/2 moa low & 1/4 moa left of the 100 yard zero for the CEB 425s.



My goal was to shoot the GS Customs 414, Cutting Edge 425 & my custom tipped Cutting Edge 425s at extreme distance to compare the BCs

I have been tipping the Cutting Edge projectiles for nearly a year now, it seems to hurt their BC a little but has no detrimental effect on accuracy & certainly makes them more aggressive on game.

So you can see the size of these projectiles they are here are next to a .223.



The barrel doesn't really like changing between the CEB & GSC bullets, it takes a while to settle down again.
The change from CEB to GSC is less noticeable than the other way around.
I HBN coat all the projectiles I fire except the GSC which appear to be Moly coated.
This and the different projectile materials, combined with the residues left in the bore could be the cause ?

A couple of things to note.

Before I shot this video I had only shot the seven GSC projectiles & had no idea how they would go.
I pay for all my own componets etc, no one gives me freebees, hand outs etc.
The rock I used as the aiming point is approx 1/8 moa, less than 3" around, about the size of you fist, the ATACR reticle nicely covers it.
I do this so I have a definitive point of aim, not some rock 4 moa across.
The three projectiles have different POIs at 2050 yards which is to be expected.
On the whole the groups sizes are very small & a testament to the projectile manufactures.

Here is the video I shot on Sunday with Kokako, sorry it is so long I had a lot to fit in.

375 Cheytac imp, 414 GS Customs VS 425 Cutting Edge projectiles - YouTube

Very cool:-)


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What did the relative bcs come out at when you worked it back Greg?

No goats then eh

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Originally Posted by veitnamcam

What did the relative bcs come out at when you worked it back Greg?

No goats then eh

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Not anywhere near what GSC advertise.

No goats but this guy wasn't too lucky

Great shooting there mate

How much it cost you for each bang?

Originally Posted by 199p

Great shooting there mate

How much it cost you for each bang?

About $7-8 + the brass cost

Its very interesting that the GSC 414gr at the same speed and in the same rifle were 7moa lower than the 425gr CE as looking at there shape they should have a beter BC, could it be the seal bands creating a wind upset over the bullet in flight dragging the BC down at the longer ranges?

Originally Posted by Terminator

Its very interesting that the GSC 414gr at the same speed and in the same rifle were 7moa lower than the 425gr CE as looking at there shape they should have a beter BC, could it be the seal bands creating a wind upset over the bullet in flight dragging the BC down at the longer ranges?

I'm not sure, but it wouldn't surprise me that the drive bands upset the airflow dramatically.

I do know that the BC isnt as high as the 425s.

I may test them against the CE 350s as the BC appears to be closer to the 414, won't be this weekend though.

Make a small wind tunnel and put a rod up the projectiles bum to hold it out. Turn on fan and put that fine powder or whatever it as and see if you can spot any distrubince

Set up the ohler at 2000y and the mageto on the barrel and measure the drop in speed :rolleyes:

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Originally Posted by veitnamcam

Set up the ohler at 2000y and the mageto on the barrel and measure the drop in speed :rolleyes:

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You quite keen to buy me another Oehler & take it up there