I have two. One is one of the very early version in .50 caliber. It is a very good shooter and I've sighted it 2" high at 100 yards using 95 grains volumetric BH209, .451 300 grain Speer Uni-Cor, Harvester CR sabot, Win209A. Accurate and consistent from season to season. I would not hesitate to shoot a deer/elk sized animal out to about 130 yards as is, but would need to practice more at longer distances to be confident. The limit on yardage is me, not the rifle.
I have another newer model which I bought lightly used. It is .45 caliber and I've really not shot it to test it out. I did invest in a 2x oversized Bellm hinge pin which made a remarkable difference in the tightness of the rifle. I expect it to shoot at least as well as the .50 cal.
The newer .45 caliber is on the left.
Very nice rifles that fit my build perfectly. The triggers on both are very good - crisp, clean "breaking glass" type actuation. They are a little heavier than some alternates you might look at. If you were going to do a LOT of walking I might recommend a lighter choice such as the Accura MR.
http://www.rrarms.com/cva-accura-mr-rifle-50-25-w-shield-rt-max-1-w-scope-mt.htmlThe one thing I would probably change on the Apex is to give it a firing pin assembly as easily removed as those on the Accura and Optima rifles. The Apex assembly is removed from the hammer side and requires a 2.5mm BALL head hex wrench. It's a bit awkward to remove and reinstall.
450 is a very good price and would be hard to beat.
Below is a pretty typical example of 100 yard groups with the .50 and my hunting load.
Two bucks taken in nearly the same spot using the .50 Apex and the load listed. Both were between 75 and 90 yards distance. Both dropped like rocks.
Finally, here is a review I did right after getting the .50 caliber in 2009. http://home.mchsi.com/~rltsr/Apex.htm The second page shows some of my initial load testing and you will see (if you look carefully at those confusing targets) why I chose the load I did as my go-to load.