And some more reduced load testing

[Pulp]

Last night I found 5 El Paso Pete Big Lube 150 grain bullets, and an old box of 180 Buffalo Ball-ets. I loaded them like the RB load posted yesterday and got the following: All over 10 grains of Goex FFFg and enough cornmeal to fill the case.

EPP 150 grain:
574
567
554
538
564

Ball-et 180 grain:
528
521
539
558
532

230 grain ACP bullet
494
518
485
469
492

I also loaded 5 with progressive charges under a Ball-et. 10, 20, 30, 35, and 40 grain loads and got the following velocities respectively: 539, 783, 961, 993, and 1057.

Here's a video of that. https://www.youtube.com/watch?v=GEZDvPWN1RI

My CAS friend borrowed a chronograph and will test his loads Tuesday or Wednesday. I'm anxious to see how his 4 3/4 inch barrel will compare to my 9 inch barrel.

 

[Blitzfike]

I've got a 2.2" Cohorn Mortar that I would like to check the velocity of, but I'm not ready to sacrifice a chronograph... I either shoot plastic ensure bottles filled with sand or concrete filled PVC pipe machined down to bore diameter. A hand held radar gun might work for it, but wouldn't be as precise. Sure eats a lot of black powder.

 

[Pulp]

Could you measure the time of flight and calculate from that? I'm not smart enough to do the math, but I bet someone could. It would be hard to aim it over a Chrony that's for sure!

A pyrotechnical person might be able to calculate it for you based on charge and mass of projectile. I think they're supposed to know things like that.

 

[Blitzfike]

My son the Computational Chemist could if he had the formula.. he could probably write the formula..

 

[Pulp]

Some folks are blessed like that. I'm pretty good at arithmetic, but when they start drawing letters and squiggles on the chalkboard I get real confused real fast.

 

[aviator41]

You'd need flight time, angle and distance to impact (wind angle and speed would be good too). With those I can calculate average speed over entire flight, but not speed at a specific moment.

 

[Blitzfike]

Kinda like OHP with the airplane and the marks on the road...