200 Grain XTP Ballistic Charts

Semisane · 10-17-2011, 01:15 PM

Here are some charts I recently worked up for the 200 grain .400 Hornady XTP using the Handloads.com Ballistic calculator.

There are twelve charts for velocities from 1700 fps to 2250 fps in 50 fps increments. A 125 yard zero was used in all of them.

bronko22000 · 10-17-2011, 01:51 PM

Semi - that is really a lot of good info. Now, I shoot this same bullet out of my .45 GM LRH bbl with 80 gr of Pyro P. Would you happen to know what kind of vel I am getting?

Semisane · 10-17-2011, 02:09 PM

Bronko, with my GM/LRH barrel I got a five shot average of 1764 fps with 85 grains of Pyrodex P and the H4540B sabot, and 1781 with 90 grains Pyrodex P. Didn't chrono any 80 grain loads with P, but I got 1773 fps with 80 grains of T7 FFG.

(Edited to add P to the Pyrodex designation.)

flounder33 · 10-17-2011, 02:50 PM

Semi, why does it matter what the sight height is?

bronko22000 · 10-17-2011, 03:04 PM

so maybe 1800 fps would be a good guess. thanks
Flounder - sight height is a factor used for ballistic tables. The difference in sight height when sighted in at a certain range changes the points where the bullet crosses the line of sight (2 places; one on the way up and one on the way down). If you take for example the 2200 fps, the initial point of crossing the line of sight is approx 30-35 yds. Beyond that, the bullet is actually traveling above the line of sight until it reaches the sight in point of 125yds. And a little farther (about 145 yds) the bullet is the same height as the barrel. (assuming you are on a perfectly level range).
Another fact that is hard to comprehend is if you shot a bullet from a perfectly level barrel on ground that was also perfectly level, regardless of the velocity, and dropped the same bullet from the same height as the barrel,they would both hit the ground at the same time. Sounds crazy but true.

flounder33 · 10-17-2011, 03:16 PM

Bronko, I knew that second part and yes it is hard to fathom.
On the sight height though, I still have a hard time seeing why it makes a difference if you have it zeroed at 125 yards I can't get it through my head why it makes a difference if the sight height is 1 inch or 2 inches. I will have to plug in different sight heights into a program and see what difference it makes.

Semisane · 10-17-2011, 04:39 PM

Quote:

so maybe 1800 fps would be a good guess. thanks

Oops. No, I think it would be more like 1750. I failed to note those figures were for Pyrodex P, not RS.

With 90 grains of RS I got a three shot average of 1730 fps.

oldsmellhound · 10-17-2011, 07:25 PM

Nice job, Semi-Insane, I appreciate the work you put into this. I was kind of surprised at how little the 200 xtp dropped in the ranges you posted. I guess one major difference is that your zero range is 125 yards, and my zero has always been 100 yards. Even though, it seems to shoot pretty flat. Good info...