The chronograph doesn't lie

Poodleshooter · 10-13-2003, 10:33 AM

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** · 10-13-2003, 12:28 PM

Very interesting I may have to try that

**awp101** · 10-13-2003, 08:46 PM

Quote:

Originally posted by Jericho
Very interesting I may have to try that

You two obviously have WAAAAYYYY more freetime than I do...

Poodleshooter · 10-14-2003, 04:36 PM

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 · 10-15-2003, 11:02 AM

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 · 10-17-2003, 10:15 PM

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.

10-13-2003, 10:33 AM	#1
Poodleshooter Registered User Join Date: May 2000 Location: Floating down the James River in VA Posts: 2,439	The chronograph doesn't lie 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. __________________ I put the "fun" in fundamentalist! "Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." -C.S. Lewis Visit the GunsNet Rimfire Forums Guns Network Discussion Websites & AK-47.net BOTH have recently recevied a 5-STAR rating from Shotgun News - 10/6/2003 issue! Do you get value out of this site? Contributions to gunsnet start at $5 with benefits kicking in at $20. Check here to see those benefits: <a href="http://www.ak-47.net/store/memupgde.htm?">MEMBERSHIP UPGRADE CENTER</a>

10-13-2003, 12:28 PM	#2
Jericho The Great Gopher Hunter Join Date: Jun 2002 Posts: 7,843	Very interesting I may have to try that __________________ Spreading the Cult of the Little Bullet: Rimfire World GUNS NETWORK.....Often Imitated.....Never Duplicated . . REDSTAR 09.05.2005 20756

10-14-2003, 04:36 PM	#4
Poodleshooter Registered User Join Date: May 2000 Location: Floating down the James River in VA Posts: 2,439	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. __________________ I put the "fun" in fundamentalist! "Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." -C.S. Lewis Visit the GunsNet Rimfire Forums Guns Network Discussion Websites & AK-47.net BOTH have recently recevied a 5-STAR rating from Shotgun News - 10/6/2003 issue! Do you get value out of this site? Contributions to gunsnet start at $5 with benefits kicking in at $20. Check here to see those benefits: <a href="http://www.ak-47.net/store/memupgde.htm?">MEMBERSHIP UPGRADE CENTER</a>

10-15-2003, 11:02 AM	#5
McBendy_Elbow Registered User Join Date: Oct 2003 Location: Jefferson, Maine Posts: 12	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 ! __________________ McBendy ~

10-17-2003, 10:15 PM	#6
Darth_Pavoris Registered User Join Date: Jan 2001 Location: n. fort myers florida Posts: 3,215	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. __________________ Death to UPN. "Just leave me water, some ammo, and chips, if you got 'em" "12 of these shotgun shells, 26 of these pussy 9 mils, 16 of these .357 MAGNUMS!" - Dawn of the Dead 2004 "Quanity has a quality all its own"- Joesph Stalin

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