Banshee: yes, speed kills...

[ISS]

curiosity got the best of me this afternoon. BC is nearly a constant, but velocity drops from the muzzle all the way to the target. What effect does speed actually have?
Berger has this neat Ballistic Calculator Program. Although it only works with Berger bullets, it is nonetheless a very useful tool hunting live varmints.
I ran their program using the 134gr bullets with their BC of .315 at the altitude I hunt at. 4000fps, with a 12 oclock wind. I see members listing 3200fps, and I am using my est vel of 3600fps, and a 400 yard zero.

3200fps MV ...... 1000 yard remaining calculated velocity:1992fps drop = -14.87moa
3600fps MV....... " :2312fps drop = 11.33moa

If we trust Berger's arrived data, every Rockchuck I hold the crosshairs on (15" tall target) I will miss completely. Bullet Impact will be 25.4" low on that 15" tall Rockchuck at 100 yards. I may not hit more than 25% of them; but 25% is a lot better than 0% with a 400fps lower MV.

For me, that is why Velocity matters, and why speed kills...

ISS

 

[ISS]

Another piece of the puzzle is in place.
Jasmine from JGS called. Took my CC information yesterday. 257 Banshee two reamer set went in the mail.
Now, just the barrel from Lilja; and getting the rifle built.
Sightron 10-50-60 is enroute as I type. Vortex ring set and diving board ordered!

 

[youngoutdoors]

I remember Walt Berger telling me that BC changes with velocity. My drop wasn't matching what the computer was telling me and Walt said to bump up the BC until it matched the drop I was having. When it was right the drop chart worked out to 1000 yds.

God Bless, Louis

 

[William Vogel]

Make sure your scope centerline and barrel centerline measurement is accurate to within hundredths of maybe thousandths of an inch or whatever measurement you use because that has a significant effect on bullet drop calculations.

 

[284winner]

curiosity got the best of me this afternoon. BC is nearly a constant, but velocity drops from the muzzle all the way to the target. What effect does speed actually have?
Berger has this neat Ballistic Calculator Program. Although it only works with Berger bullets, it is nonetheless a very useful tool hunting live varmints.
I ran their program using the 134gr bullets with their BC of .315 at the altitude I hunt at. 4000fps, with a 12 oclock wind. I see members listing 3200fps, and I am using my est vel of 3600fps, and a 400 yard zero.

3200fps MV ...... 1000 yard remaining calculated velocity:1992fps drop = -14.87moa
3600fps MV....... " :2312fps drop = 11.33moa

If we trust Berger's arrived data, every Rockchuck I hold the crosshairs on (15" tall target) I will miss completely. Bullet Impact will be 25.4" low on that 15" tall Rockchuck at 100 yards. I may not hit more than 25% of them; but 25% is a lot better than 0% with a 400fps lower MV.

For me, that is why Velocity matters, and why speed kills...

ISS

Use another ballistic calculator. Something isn't right with the 11 moa at 1000. Should be in the neighborhood of 15 at that speed with the 134s at 4K elevation. At 3200 fps (which I'm pushing the 134s) your number should be around 19-20 moa.

 

[ISS]

with 4000fps?

 

[284winner]

with 4000fps?

That would be around 11-12moa. Closer to 12. Speed definitely kills. That's why Corbon ammunition company used that slogan for their handgun ammo.