skeeter 7MM

Only way to know where your POI will be at varing ranges is to shoot groups at those ranges. Letyour gun do the talking not ballistic programs or paper data. The info posted prior wasballparknot gospel, so if your groups at 100 yards were 4" high then that's right for your load/gun. Wether that is right for your hunting situation...you'll have to determine that.

For the majority of my hunting when my 270 was on deck I sighted in + 2.5" @ 100with 130gr pills which allowed me to hold fast to 300 yards without worrying about hold over.

stubblejumper

Read all of the ballistics tables you want.Then sight the rifle in at whatever height above zero you choose at 100 yards,be it 1-1/2" high or 2" high.Then shoot the rifle at 200 yards and then 300 yards and you will know for sure exactly where the point of impact is.Ballistics programs and tables are only theory,and blindly trusting them has resulted in many people wounding or missing game.

Ideaman

Absolutely, positively, irresponsible to shoot at a range you have not practiced at. You wanna shoot 500 yards take a few hundred shots on a 500 yard target.

Ballistics charts are pure math on very specific gun configurations. Stated ballistics seldom match when chronographed. Scope height, average temperature, barrel manufacture, and a whole bunch of other things cause stated ballistics not to be true. I have way too many holes in my 100 yard shooting house that came from people whoCALCULATED their shot.

Anybody out there that can calculate where a bullet will hit every time, call NASA, they have been looking for you.

stalkingbear

I wholeheartedly agree that the ONLY way to know for SURE EXACTLY where your specific setup is going to impact,you have to shoot it at ranges in question. The ballistic programs are kinda like boresighting the way I see it-they'll get you on paper. There's a lot of variables on dimensions/tolerances to predict individual rifles' performance.

Wilds

All to often though, that point is missed by a wide margin.

Pun there.......

eldeguello

I've owned two .270's, both Mannlicher-Schoenauer fullstock carbines with 20" barrels. I had two loads, one used the 130-grain Nosler Partition bullet with 55.5 grains of IMR 4350, and the other used the 150 grain Nosler Partition with 53.5 grains IMR 4350. I zeroed these rifles to hit +4"@ 100 yards. They then hit +4" @ 200 yards, and 4" @ 300 yards, and BOTH BULLET WEIGHTS shot to essentially the same POI at 100 and 200 yards. (A known propensity of the .270 Win., and the .375 H&H as well.)

The last .270 M/S was one I bought in 1964. After mounting a Lyman Alll-American 4X fixed-power scope on it and zeroing it in 1964, every year after that I'd fire ONE ROUND each fall to check the rifle's zero before hunting with that rifle. I sold it in 1987, and when I sold it, it was still shooting to the exact same POI it was zeroed for in 1964! In all those years, it NEVER CHANGED zero - what a dummy I was for parting with that rifle!!!

stubblejumper

Loading manuals,ammunition manufacturer tables,or ballistic programs do not provide this information regardless of what people may believe.Predicted velocity,and manufacturers BCs can be quite different from the actual values.

Wilds

Nuthin' replaces trigger time..........

eldeguello

Indeed, it COULD BE +4" @ 100 and be +1" @ 50.... All rifles are at least somewhat different than the other ones...... Try it now at 200, and see what happens. And also at 300, if you have access to a surveyed 300 yards.

I never missed by overshooting with a zero that was +4" @ 100 and the same at 200. However, I believe anything that hits muchabove +4" at 100 and200 will have a maximum ordinate of+6" or perhaps more, and that's enough to cause midrange misses.

stubblejumper

The bottom line is that you still shot the load to verify the point of impact,something that far too many people never do.Too many people simply look at a published chart,sight the gun in at close range,then go hunting and take longer range shots hoping that the chart is correct for their load and rifle.