chronograph?

[MCMXI]

Bart B,
That same tired old target again? I warrant that 99% of your shooting was on familiar square ranges nicely marked off with lots of flags. If you're shooting moa UKD targets at long ranges at unfamiliar locations with no wind flags you're going to want to have low SD values. I just put another steel target up at my place at 1050 yards and you're welcome to drop by any time and show me how to make first round hits on that target. There are no wind flags and plenty of wind to deal with. Sorry but I'll stick with Bryan Litz and his thoughts on this issue.

 

[Reloadron]

Reloadron, regarding my claim,

Read post 23 in:

http://www.thehighroad.org/showthread.php?t=797494&highlight=free+recoil

I've asked hundreds of people to do that test Metal God did but he's the only one I know of that did it.

I guess I'll have to make a "velocity test platform" then bolt a barreled action to it, photograph it to show the world how a cheap and very precise way to measure muzzle velocity numbers very precisely to single digit numbers with near 100% statistical confidence. Lousy for accuracy, but once a good load with great velocity numbers is developed, then test it for accuracy.

Old thread but served to remind me I did a small science experiment. I loaded 50 rounds of .308 Winchester as follows:

Bullet Weight and Brand: Sierra 150 grain Matck Kings
Powder and Charge: AA2495 44.0 grains
Primer" CCI BR2
Case: WCC 08 (Once Fired)
Case Length: 2.005"
Cartridge OAL: 2.775"

Rifle was an older Remington 7oo BDL VSSF which I had customized.

Bench Setups:

Chronograph used was an Oelher 35P

Wichita Rest using bunny bag and owl bag:

The rifle upon firing was allowed to free recoil into my shoulder which afforded several inches of recoil in a rearward motion as expected.

Lead Sled stable on the bench:

The lead sled afforded no recoil or movement of the rifle in a rearward direction.

Below are the results of the two twenty five shot strings. Twenty-five rounds on the Wichita Rest and twenty-five rounds on the lead sled. The column on the right represents the lead sled. The difference in average mean velocity was 8 FPS which is really nothing between the two rest used.

I seriously doubt it would matter if I shot 50 or 100 in each group.

<EDIT> I forgot to post the results:

Ron

 

[Gtscotty]

Did you post the results?

 

[Reloadron]

Did you post the results?

Thanks for pointing that out. Can't believe I managed to leave out the chronograph results.

I attribute that to getting old.

Thanks Again
Ron