Anyone load to simplify drop calculations?

[Bluumoon]

After reading a post by @Formidilosus last year I realized my 6.5 cm load was perfect for calculating drops from 300 yards to 600 yards. Ie "Base of 2" I think would be the wording. 300 yards 3-2=1 mil of drop, 350 yards 3.5-2=1.5 mil, etc.


Well the 6.5cm got chopped and now the "Base" appears slightly variable, but still within .1mil or so out to 600. Shots were fast and fun last year w buddy calling ranges and me correcting on the fly. The base # of two was thoughtless.

 

[SamsonMan22]

I tend to like loadings that follow the base or are at least predictable if I can get them. My 6.5cm follows the rule of using the base perfect, the 223 practice load I’m using is adding .4 to the base from 3-500 then add .6 at 600. My hunting load for the 223 adds .2 from 3-500 and .4 at 600. Using these numbers will put me to within .1 all the way to 600, it’s not hard to remember the additions or subtractions if they show a pattern. I just write the additions for the yardage on the inside of my scope cap to keep it handy.

Where it gets to be a pain is if you add or subtract random amounts all the way to 600, my 22cm was that way and I started to have to rely on a dope card instead of just remembering it.

 

[Mtnmilsurp]

I was pleasantly surprised to find that 108 ELDM in 6mm ARC out of a 20” barrel in an AR (2.5” sight height over center of bore) at 2,650 fps at 7,000 feet altitude fits THE FORMULA perfectly. That just happens to be what I get from factory 108 ELDM so when it’s time to reload I’ll try to duplicate that.

 

[Jimbee]

I've considered this. It's even harder to figure when your density altitude can fluctuate from -2500 (Iowa winter) to 10000 in Colorado. My 6.5cm goes from a "bad gun" to a normal gun, same with 223.

 

[SamsonMan22]

I've considered this. It's even harder to figure when your density altitude can fluctuate from -2500 (Iowa winter) to 10000 in Colorado. My 6.5cm goes from a "bad gun" to a normal gun, same with 223.

That’s one thing that helps me, all of my shooting and hunting is done at roughly the same altitude. I have to adjust for temps a little bit but the temps ranges are pretty wide for each adjustment even with sensitive powders.

 

[Bluumoon]

I've considered this. It's even harder to figure when your density altitude can fluctuate from -2500 (Iowa winter) to 10000 in Colorado. My 6.5cm goes from a "bad gun" to a normal gun, same with 223.

Lucky I live and shoot close to where I hunt in CO.

 

[Justin Crossley]

No, I don't even worry about it. I use RF Binos with a solver and have a drop chart as a backup.

 

[Vern400]

Yes. By hundred yards increments I'm at
+2.1/0/-8/-24/-48 inches
With 5.56 AND 7.62
With hunting AND match bullets.
I've got them precise and uniform to 400 yards within a few inches.

But Noooo. Too simple. I had to start switching to Mil scopes. I still have to use a chart if I'm shooting for a score. But just banging a target? Or deer? Nope. I hope to get my gas gun tuned in there too... But the jury is out on that one.

 

[Wrench]

Base measurements are fine on critters to 300ish with just about anything. Beyond that math is the way I roll on critters.