Conversions

[catman]

Has anyone ever seen a conversion chart from mm to caliber? If so, please post it.

Thanks,
Trav

[Keith_Hixson]

Not sure (My memory isn't what it use to be) but I believe Remington Arms has one on their site.

Keith

[82Rigger]

..can't find a chart for ya at Remington or elsewhere on the net.

Are there any particular metric cartridges you have in mind?

To convert:

millimeters X .03937 = inches (This won't be exact)

Some of the more common ones:

RIFLE

5.56 mm = .223 Remington

6mm Remington = .243

6.5mm = .264

7mm = .284

7.62mm = .30 caliber

8mm = .323


PISTOL

7.62mm = .30

7.65mm = .32

9mm = .354 inches

10mm = .40 cal

11.5mm = .45 cal.


Hope this helps.

[catman]

Steve...that helps a lot, thanks for the effort!

Trav

catman-

Noted from the other thread that you own a 7.65 Argentine(AKA 7.65 Mauser,AKA 7.65 x 53 Mauser).Thought I'd pass along the following info. taken from the Sierra Reloading Manual in case you're looking for info. on that cartridge:

Bullet dia.=.311 (same dia. as the .303 British and the 7.7mm Arisaka).

You could save a bunch of ammo money and likely improve ammo quality by handloading..30-'06 brass can be run through the 7.65 sizeing die then trimmed back to 2.11" to give you new cases.

Listed max. handloads:
150 Gr. .311 Spitzer=2700 FPS
180 Gr. .311 Spitzer=2500 FPS
____________________________

Might wanna keep in mind that the "stated cal." of a given cartridge and the actual bullet dia. that cart. is designed to use may be very different especially as applied to handgun bullet dia.s.

.38 Spec. uses a .357 dia. bullet
.38 Super,380 Auto,and 9mm all use .355 dia. bullets
.44 Spec.,.44Mag. use .4295 dia. bullets as does the .444 Marlin
.45 ACP,.45 Long Colt,etc. use .4515 dia. bullets while .45-70 uses a .458 dia. bullet.

The .218 Bee,.219 Donaldson Wasp,.219 Zipper,.222 Rem.,.222 Rem. Mag..223 Rem. all use .224 dia. bullets.Go figure.

Just goes to show that what you see(in the cart. name)ain't necessarily what you get(as far as bullet dia.).

[David]

caliber millimeters c.f.== 0.254


Example of the Beretta 92FS CO2 pistol.


4.5MM = (.177 caliber)

.177 x 0.254 = .044958 = 4.49MM or 4.5 MM


Here is a great conversion calculator to take the headspace out of the calculations.

http://www.chemie.fu-berlin.de/chemi.../units_en.html

[catman]

Thanks guys!

Trav

[colmurph]

'Nother "cute" one. .38 Colt has a .357 dia. bullet but the older .38 Long Colt had a bullet of .375 dia. Colt .36 cal. percussion used a ball or conical bullet of .375 dia. which can be used in the .38 long colt if you have an old mold.

[82Rigger]

...started handloading in the early sixties all of the "22 caliber" centerfire cartridges used .224 diameter bullets...except one, that used a .223 diameter bullet. Trying to remember which cartridge that was.

Doc...

Many times I've wished some company would bring back some of those old cartridges like the .218 Bee and the .219 Donaldson Wasp and the .257 Roberts.

Ruger, I believe, did a comeback with the .220 Swift in their M77.

82Rigger-

The older .22 Hornets were barreled to use .223 bullets.I kinda think that the .22 Hi-power also used them but I don't have data at hand to confirm or deny this.

Not too long ago it wasn't too hard to find Thompson Center Contender pistol barrels in .218 Bee,.22 Hornet,or .222 Rem. Afraid I haven't been paying enough attention lately to know if this is still the case.Always thought that any one of these rounds would be a good combination with the T/C pistol but never have gotten around to trying them.

If the .257 Roberts is dead it just refuses to lie down.Still has a pretty good following amongst old-timers.Spect we'll still be seeing it as a limited production or rechamber item until after we're gone.

Happen to have a heavy barreled Win. M70 wearing a 15X Unertyl scope in .220 Swift (rechambered from .225Win.)sittin around here someplace.It's been known to reach out and touch things waaay out there.Doesn't see much use these days but spect it'd still do the job if asked.

Speakin of the .225,this is a very fine .22 round (doesn't give up much to the .22-250) to rechamber/rebarrel to if you ever run up on some of those old British single-shot actions (Snyder?) (falling block?)designed to use rimmed cases.Played a good bit with one of these that was a real tack driver.Think the action sold for about $30 and had had a rebarrel job.Think BSA also produced some actions suitable for conversion.