HI-JACK!!!! 30-30 is better (has bigger bullets with same trjacetory)
ummmmmmm, what? Do you have any substantiation for that baseless statement? No? OK, well, let's run the numbers, eh?
From Hornady #7, we see that a 30-30 can push a 150gr RN at about 2300fps with an impressive 0.186 BC. Flipping over a few pages, we see the 7.62x39 pushing a 150 gr spitzer at 2200 fps. With a BC of .415.
Plugging those numbers into a ballistic calculator, we find that the 30-30 has the following trajectory when zeroed at 100 yards:
Yards Elevation Velocity
0 -1.5 2300
50 .23 2091
100 0 1893
150 -2.72 1709
And for the 7.62x39:
Yards Elevation Velocity
0 -1.5 2200
50 .22 2107
100 0 2017
150 -2.32 1928
So what's this about the 30-30 having a better trajectory, or more downrange power? Shall we look at 170 grain weight class? Well, there is no published data for 168's in the x39, but I've handloaded them to just under 2100 fps in my 7.63x39 bolt action gun. At this velocity, they're packing the same muzzle *energy* as the 150 grain loads, at perfectly acceptable pressure levels. The 30-30 is pushing it's 170gr FP also at 2100. But, for argument's sake, lets say that the x39 is only doing 2k, 100fps less than the 30-30 (the same difference observed in the 150gr weight class). The 170FP has a stunning .189 BC, while the 168 is right around .450. Math time, kids!
30-30
Yards Elevation Velocity
0 -1.5 2100
50 .46 1904
100 0 1722
150 -3.41 1554
And for the 7.62x39:
Yards Elevation Velocity
0 -1.5 2000
50 .43 1919
100 0 1840
150 -3.05 1764
removed snide remark from here....PGW Steve