Sunday, May 03, 2015

Looking at the specs for .338 Federal,

looks like with Federal ammo(or something  to the same weight/velocity) a 100-yard zero would be about four inches low at 200.    Or could put it two inches high at 100 and be two low at 200.  Have to decide.


2 comments:

Leigh said...

That would depend on what you anticipate your longest shot to be. Or better yet, the distance you do the most shooting at. Here in the East, most of our hunting ranges are inside of 100 yards. For me, being 2" high at 100 would put the bullet quite a ways over POA inside of that range - though I haven't studied on the .338's chart. That being said, all of my center fires are sighted for 100 yards.

I see that you have inspired John Jay to start tinkering again. Now he has to get the plywood plinker finished. I 'm interested to see it run.

Leigh
Whitehall, NY

Leigh said...

Looks like I was wrong.

At a roughly 180 yard zero puts the bullet travel at 2" above POA.
http://image.frompo.com/5819e8595c576de1ad2a46423886e3c1

A 300 yard zero puts the bullet 5.4" above POA. Scroll down for the chart.
http://www.falfiles.com/forums/showthread.php?t=309083

Found a NICE ballistic calculator while I was at it.
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

Leigh
Whitehall, NY