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...and the there's "Spin Drift".....oh, the fun that's to be had. Lucky for most of us there are computer programs to get us in the ballpark first :thumbsup:

...And I was just thinking about how much I was going to have to spend on an Ohler....
...Now I have to factor in an extra $400/hr per range session for chopper hire.......long-range just keeps...

-I'd been thinking about doing this.
But as I don't crimp or laquer my rounds, I'm a bit worried about the effect of all the bacteria and viruses on my powder. -probably mess with the burn rate as...

Glad we cleared that one up :thumbsup:

Thanks for the idea Baldbob. It's not the wrong combination- not according to the top benchrest/F-class shooters in the states anyway. But then again, they may not be experiencing the low...

Good info. Thanks for your help Sneeze.
Yeah, drop was just over 4 inhes at 600 so that fits. The variability of the chrony is becoming obvious- I'll go forward just using it as a guide to get me...

Thanks, appreciate it.

Good enough for me :thumbsup:

-Now, how many organs will I have to sell to purchase one here in NZ? (trying to stick to a policy of supporting NZ retailers- what goes around comes around).

Roger that. I only have the upper model in the "Shooting Chrony" range, 'Alpha Master' or some such.

Funny you should bring it up, I was just researching Chronys earlier. I really like the idea...

Thanks for the idea Sneeze,

I only validated the 'Summer' speed out to 550yds- is that enough??

Last weekend I tested at 400yds, 600yds, 800yds and 1000yds. Only shot 5 rounds per distance. But...

Cheers,
Have heard good things in the past- will give it a go.

Thanks dogmatix,
That was just the kind of stuff I was interested in. (bonus that you use the same powder).

-So about a 5% loss for you too then.

-Do you think 2213sc is as temperature-stable...

Thanks R93.
-So do you think the drop in trajectory is more likely due to the change in atmosphere? Rather than a decreased muzzle velocity due to the powder/temperature?

(guess I'll know for...

Really keen to hear from more experienced shooters:

I'm using AR2213sc in a 6.5-284, 50.5gn pushing 140 Bergers at a lesuirely 2900fps.
-Worked this load up last summer (20-23 degree days), it...