A Handy Tool For Those Without a Chrono

[Gaznazdiak]

For those like me, without all the flash testing jiggery-pokery, a handy resource for calculating muzzel velocity.

With calculation presets for:

6.5 Grendel
.223
.243
308
.357 Magnum
.45 Auto

http://shootersnotes.com/calculator/velocity-estimator/

[Stix]

Thst'd be right...ive got none of those cartridges...!!!

OMG...thats really sad eh...!!

[duncan61]

just did the .243

[Gaznazdiak]

Thst'd be right...ive got none of those cartridges...!!!

OMG...thats really sad eh...!!

Sad be buggered Stix, it's a tailor made reason to get at least one of them.
Glass half full mate.

[Gaznazdiak]

Is anyone with a chrono willing to test the accuracy of this tool for those of us who don't?

I'd be interested in how close their algorithms come to reality.

[marksman]

sure

I can do the 308 next time I'm out

[Gaznazdiak]

Thanks Marksman.
It would be handy to know.
Happy New Year to you.

And the rest of you too.

[marksman]

so after putting in existing data I already have the velocity estimator said 2839fps and my actual chronograph velocity is 2834fps

I would say close enough

[Gaznazdiak]

Well done!
Thanks for that

[Chappo]

Maybe the chrono needs calibrating marksman.

[marksman]

Maybe the chrono needs calibrating marksman.

maybe

[Barrettmr]

I tried using a 223 load that has been tested and it estimated about 50fps faster and placed a warning that the load was massively over pressured. Load is 25 gr 2206h on a 55 gr soft point... Still the speed is about the same.

[marksman]

I tried using a 223 load that has been tested and it estimated about 50fps faster and placed a warning that the load was massively over pressured. Load is 25 gr 2206h on a 55 gr soft point... Still the speed is about the same.

these types of programs can never be 100% accurate as the burn rate of the powder can change from batch to batch
also you have to find the internal volume by weighing the water in a fired in that chamber case for the program
it seemed close enough for me for those who dont have a chronograph to be able to get some ballistics for drop at distance
but you still need to real world test the drops at distance even with a chronograph reading

[SCJ429]

I tried using a 223 load that has been tested and it estimated about 50fps faster and placed a warning that the load was massively over pressured. Load is 25 gr 2206h on a 55 gr soft point... Still the speed is about the same.

I got the same warning for a 243, with a 107 grain bullet using Retumbo, 51 grains was good for 3580 fps. I can only get a bit over 3200. Perhaps I messed it up.