**WARNING** for those tweaking their loads!

[AP2020]

now I am getting somewhere!



I have PLC and PAC controllers at my disposal at work, All I need is a Allen-Bradley Processor and a 4-20mA Input module!

http://www.ebay.com/itm/MM4051-Mighty-Module-Strain-Gauge-Input-Transmitter-NIB-/140515405659?pt=LH_DefaultDomain_0&hash=item20b75eef5b

 

[AP2020]

more good reads:


http://www.frfrogspad.com/intballi.htm

 

[CatShooter]

260 Ackley...

Please don't cloud a discussion that is rife with supposition, myths, and hearsay... with anything that looks, smells, or sounds like science. It really ruins the thread!!

I mean, wadiya lookin' for... da Trut??

 

[broncman]

The problem with strain guages is calibration.... How you gonna calibrate for each barrel you use it on?

 

[chino1969]

i never once said that a chronograpgh is to be relied upon soley. if you take a given starting powder charge and watch the velocity as it rises as you increase powder and document the progress and all the other pressure indicators, you will notice the velocity peak then start to fall off again. once this peak is reached any further powder added just becomes dangerous. id have to go back thru several hundreds of issues to find the article written in Percision Shooting magazine to find the lengthy study done on this topic. im sorry but i cant remember what issue it was featured in.

I have noticed this phenomenon before; usually with A.I. chambers. With my very 1st .22-250 A.I. I was working up a load over a chronograph. I was able to watch a .3 grain powder increase and subsequent rise in elevation on target @200 yds.. At close to the upper point I found that an increase in powder charge yielded no more velocity and/or elevation on target increase. I backed off just a taste and this turned out to be my pet load.

 

[BoydAllen]

Good info. I'll remember that one.

 

[AP2020]

260 Ackley...

Please don't cloud a discussion that is rife with supposition, myths, and hearsay... with anything that looks, smells, or sounds like science. It really ruins the thread!!

I mean, wadiya lookin' for... da Trut??

Haha....you know how us engineers are....always tinkering!

 

[bigedp51]

This is why I like our summer Zombie shooting league, its always the people with the expensive chronographs and spotting scopes that get bitten when they are looking at their chrono readings or using their spotting scopes.

Those of us with our cheaper Stevens 200 rifles and Tasco scopes don't let the Zombies get close enough to bite us.

 

[jo191145]

I must be missing something??

If guns exploded because you went a measly 300 psi over some computer models interpretation of max this might all be pertinent. And most of us would already be dead.
Which brings me around to Zombie shoots Ed. Sounds interesting, real thing or just humor?

 

[Ackman]

28" Barrel
42.1 gr. H4831SC
75 gr. Hornady VMAX
3,395 fps
2.700" COL
57,101 psi

57,986 psi MAX Pressure




58,328 psi

57,986 psi MAX Pressure

or 342 psi OVER MAX Pressure[/color]

22-250 case is rated at 65,000 psi.

 

[bigedp51]

I must be missing something??
Which brings me around to Zombie shoots Ed. Sounds interesting, real thing or just humor?

jo191145

At a Zombie shoot us poor folks don't have no chronographs and fancy rifles, so we just wait for the Zombies to get closer and shoot them in the head.

I tried the unlimited Zombie shooting class and went out and bought a second hand AR15 rifle with 30 round magizines. But I'm old fashioned and like my bolt guns and I might be a little on the cheep side. I kept raising my head to see where my brass went after pulling the trigger and would loose my cheek weld.

A chronograph wouldn't help me with the cheek weld problem.



Besides I was just hanging around waitin' for CatShooter to hit someone with his purse. (I mean chronograph) :

 

[JohnnyJohnson]

As an inexperienced re loader, how would a chronograph relate to pressure? How would i know there is a problem other than the obvious signs? Thanks Jeff

It does not... start low, and work up, while looking for the usual suspects.

Chrono's do not reveal pressure.

Really then why is it all the sudden you see velocity skyrocket on your chronograph instead of a gradual rise?

 

[CatShooter]

As an inexperienced re loader, how would a chronograph relate to pressure? How would i know there is a problem other than the obvious signs? Thanks Jeff

It does not... start low, and work up, while looking for the usual suspects.

Chrono's do not reveal pressure.

Really then why is it all the sudden you see velocity skyrocket on your chronograph instead of a gradual rise?

I don't, and I chronograph twice a month.

Lemme see... one guy says his loads increase as he increases the powder charge, and then flatten out and don't increase, and then they go slower when he increases his powder charge...

... and now we have another guy that says that he has mysterious and unaccounted for, "Skyrocketing velocities", when he is working up loads..

This keeps getting better and better.

 

[JohnnyJohnson]

As an inexperienced re loader, how would a chronograph relate to pressure? How would i know there is a problem other than the obvious signs? Thanks Jeff

It does not... start low, and work up, while looking for the usual suspects.

Chrono's do not reveal pressure.

Really then why is it all the sudden you see velocity skyrocket on your chronograph instead of a gradual rise?

I don't, and I chronograph twice a month.

I have a clue for you. You're not watching closely enough. ;D

 

[CatShooter]

As an inexperienced re loader, how would a chronograph relate to pressure? How would i know there is a problem other than the obvious signs? Thanks Jeff

It does not... start low, and work up, while looking for the usual suspects.

Chrono's do not reveal pressure.

Really then why is it all the sudden you see velocity skyrocket on your chronograph instead of a gradual rise?

I don't, and I chronograph twice a month.

I have a clue for you. You're not watching closely enough. ;D

I have a clue for you... I get paid to watch. It is my job.

 

[bigedp51]

Dear CatShooter

Its called dry humor and you picked your screen name and what I'm seeing is a chronograph cat fight.

Vorsicht!
Kampf-Katze!

Whats wrong with you people, one person even wanted to know if I was joking about a summer Zombie shooting league.

The next silly question will be do you really need a chronograph to get better scores in the summer Zombie shooting league. :

The answer is "NO" you do not need a chronograph to get ahead in the summer Zombie shooting league.




This humor "might" be as dry as a popcorn fart.