Why not a RF comeup and wind pinned thread?

[9H_Cracka]

I just went through pages and pages of topics - none so far I can find about this.

It would be great if we had this for 22LR 40 gr supersonic, 40 gr subsonic, 17 Mach2, and 17 HMR, don't you think?

 

[kombayotch]

Re: Why not a RF comeup and wind pinned thread?

JBM has models for rimfire bullets. You can get more precise dope using that if you know your velocities.

 

[bohem]

Re: Why not a RF comeup and wind pinned thread?

Seems to be a good topic, though the velocities are pretty important, so I've tried to work out BC's for a few different ammo's and write the speeds down for each of my rifles with each ammo.


The G1's that I can glean from about a dozen types of 40gr ammo are:

RN G1 0.147-0.150

HP G1 0.140-0.142

The 36gr ones end up being almost exactly 10% less.

Knowing your average velocity and using that information will get you much closer than using someone else's dopes.

 

[kombayotch]

Re: Why not a RF comeup and wind pinned thread?

You want to use RA4 drag models for .22 rimfire, not G1. JBM models use the RA4 models.

 

[hrt4me]

Re: Why not a RF comeup and wind pinned thread?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body">You want to use RA4 drag models for .22 rimfire, not G1. JBM models use the RA4 models.</div></div>

Thanks, that's good to know.

 

[TOP PREDATOR]

Re: Why not a RF comeup and wind pinned thread?

would be a worth while sticky.

you can alsways ask. there may be something here for you:

http://www.snipershide.com/forum/ubbthre...670#Post1299670