220 & 240 subsonic bullet drop

[steezo757]

This may help you. It's all theoretical, but it may get you close.

http://www.handloads.com/calc/

[Pitt300]

Thanks.
I tried that table first but I couldn't figure out how to compare them since you are putting in the Zero range @ 100 yards.
I think someone will have to tell me that has done it.
I shot a couple of subs @ the range & they never hit any of the extra paper that I had attached to the bottom of the target & I heard them ricochet off the ground but I couldn't see where they hit so I stopped shooting.
We have a 200 yard range so if I get them zeroed @ 100 yards they should impact the backstop berm.
Looks like Zero @ 110 yards is better (flatter shooting) to me.

[justshoot]

http://www.eskimo.com/~jbm/ballistics/traj/traj.html
.

[Pitt300]

Thanks.
Shot first rounds w/o chrono & they must have been really slow & fell over 36" @ 100 yards so when I looked @ those tables & calculators they did not make any sense to what I observed.

300-221 Results today:
16" Model 1 Sales upper
All shots fired thru AAC 7.62SD
Shot today w/chrony & upped the charge & they appear to be about:
150g Rem PSP w/8.3g H110 @ 1055 fps - 10.7" low
220g SMK w/10.9g H110 @ 1272 fps - 5.3" low
220g SMK w/9.9g H110 @ 1081 fps - also 11" low
220g SMK w/9.3g H110 @ 967 fps - 12.5" low
All 220s seated @ 2.14" COAL to fit in unmodified mag.
Win .223 Brass/WSR primer
None totally cycled the action.
Some ejected but failed to pick up next shell.

[justshoot]

ya I used JBM for a long time for everything I shot and loaded for.
I finally this year got the Perry systems EXball for palm pilot. So I can just take it with me to the range or out in the field.