I want to start out with the CVA break barrel sighting in at 25 yards for a 100 yard zero. Everything I can find is for ARs with a high scope mount. From what I can tell it looks like if I sight it in at 1.5" low at 25 it should be pretty much on at 100. Does that make sense?

A good place to start, can fine tune at 100 if needed

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

The tables don't seem to open correctly in Firefox but they open fine in IE. Key in a bullet diameter and weight on the left side, key in a velocity and sight height kind of mid screen and select 'Calculate'.

For example, a .224" spire point bullet, weighing 55gr, traveling at 3300fps. with a sight height of 0.5" will be 0.04" low at 25 yards and on at 100.

A fella can spend all afternoon playing with the inputs...don't ask me how I know.

The exact one I was gonna recommend Hoot! I laser sight and work up a probable trajectory on that site before I ever head out to sight in. Lotta sighting in that sentence! Easy enuff to figger the height above bore by dropping a cleaning rod down your bore. In fact, I'm switching from a red dot to a compact scope on my .223 so I'll be doing the laser and computer work again.
bob

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I haveusedthe above mentioned calculator and Hornady's

http://www.hornady.com/ballistics-resource/ballistics-calculator

Yes, one can end up whiling away a good bit of time calculating "What-Ifs" with either.

As you know my range is 50 yards and can stretch to 110 and I have found both to give just about the expected results. I have not been able to carry the results out any farther.

With military 855 ball. and M-16 sight height (I'm guessing 2 - 2.25") 27 yard zero should be on at 300m.

until it fits your situation.

http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi

that these 'sight in at 25 yards' protocols were intended to establish battle zero with multiple rifles with sights, barrels and ammunition all manufactured to specific contract specifications. Even when it all works perfectly, you still get a rough zero that generally approximates a human torso; a far less perfect zero than most of us will settle for with a hunting rifle.

I've seen this tried with a myriad of personally owned AR's supplied by patrol officers and we invariably end up making adjustments to get them in the 10 ring of a B27 at 100 yards.

When zeroing my personal rifles, I staple a 7" paper bowl into the center of a B27 and use that to bore sight them at 50 yards. I am usually at least on the edge of it in the first few shots and have the rifle zeroed at 200 in 20-30 rounds of ammo. Often less.

to the whole thread, not your reply.

Correct. Got us on paper but shot quite a bit higher than what I figured it would have. Would have been ok on a man sized target but no where like zeroed in.

that I was impressed with that little rifle. Small, light, inexpensive, but has a dang good trigger and shoots nicely.