Determining BC and drop for big bullets

[BKM]

Dreamhunt explained how to figure out ur BC very well.
The only thing I can add is that with the modern mzl bullets we now have with the long aluminum tips such as the Pittman, Parker & ASG the G8 drag model is far more accurate than the G1 when figuring out ur drops.

 

[ajkellerusmc]

Buy the Barnes 290 With the tip installed and boat tail configuration. Remember to swab out your barrel every shot 1 wet then 2 dry patches. If you do not velocity will drop off with a cruddy barrel after each shot. I tested this through a chronograph and was amazed to see the velocity deterioration without a clean tube. This might not impress most but I have my Thompson shooting 5 Moa at 300 yds topped with a leupold 3:5x10 CDS. A great Elk gun.

 

[ENCORE]

Buy the Barnes 290 With the tip installed and boat tail configuration. Remember to swab out your barrel every shot 1 wet then 2 dry patches. If you do not velocity will drop off with a cruddy barrel after each shot. I tested this through a chronograph and was amazed to see the velocity deterioration without a clean tube. This might not impress most but I have my Thompson shooting 5 Moa at 300 yds topped with a leupold 3:5x10 CDS. A great Elk gun.

Those won't work in the barrel he has.

 

[BKM]

Buy the Barnes 290 With the tip installed and boat tail configuration. Remember to swab out your barrel every shot 1 wet then 2 dry patches. If you do not velocity will drop off with a cruddy barrel after each shot. I tested this through a chronograph and was amazed to see the velocity deterioration without a clean tube. This might not impress most but I have my Thompson shooting 5 Moa at 300 yds topped with a leupold 3:5x10 CDS. A great Elk gun.

I assume u meant 1/2 moa instead of 5 moa.
What kind of velocity are u shooting them out of ur Thompson?