The chronograph doesn't lie

[Poodleshooter]

How many folks run their rimfire ammo over the chronograph?
If you have one, it might be worth your time, and help explain those odd fliers.
Yesterday I ran some bulk Remington Golden's over the chronograph (I use them to check light levels and alignment before testing centerfire ammo). Results were relatively appalling, but not unexpected. Extreme spread out of my Midway 18" barreled 10/22 was almost 100fps. Average velocity ranged around 1140fps at 4' from the muzzle-barely supersonic. Hardly the oft claimed 1255fps that high velocity ammo is supposed to provide. This of course provided the answer as to why ammunition with a 50yd zero is nearly 6" low at 100yds.
Now, I need to correlate weighing of ammuntion with velocity. If I'm right, there should be a direct relationship.

[Jericho]

Very interesting I may have to try that :)

[awp101]

Originally posted by Jericho
Very interesting I may have to try that :)
You two obviously have WAAAAYYYY more freetime than I do...:rolleyes:




















:D

[Poodleshooter]

No, THIS is a man with too much freetime:
Varmint Al:
http://www.cctrap.com/~varmint/arelo.htm

A guy on another board posted one of his articles about friction of case extraction and it's relavance to brass stretching and case life. Complete with calculus and graphics.

[McBendy_Elbow]

Poodleshooter ... The more "like" the individual cartridges are the better the accuracy will be .... You can measure rim thickness, cartridge weight, and velocity, but what you can't measure is the amount, distribution, and uniform detination of primming compound ?

One item to ponder is, if the cartridge weight varies what is the cause (?), Case, powder, or bullet weight or combinations of all three plus rim thickness ?

Uniform velocity with very little spread from the low to high is the product of quality control ... ALL cartritridges being close to the same ?

In my "amateur research" I've dis-assembled and distroyed many brands of ammunition from Tenex to winchester wildcats ... Wildcats vary in all measurements taken where as Tenex is extremely close in all catagories !

I think the key to accuracy, derived from "likeness" of cartridges, the product being consistant velocity ... Certain rifles deliver the best accuracy with cartridges of a velocity falling with in a given range !

I'd be interested in your findings ... Good luck !

[Darth_Pavoris]

all the bulk pack ammo from wally world sucks serious ass unless it says "Dynapoint" on the box.

super xs- even more underloaded than GB's won't reliably cycle my freinds 10-22, my remington a77, or my smith 22a

GB's 1/2 grade above super xs

federal bulk-cycles grossly inaccurate good for short range plinking.