Chart of all Rifle Calibers In Order, And Their Power

If you’re just getting started in learning about firearms, it can be really complicated to understand all the different calibers and what each cartridge is capable of. Let’s begin with understanding what caliber actually means.

“Caliber” is a measurement in inches of the internal width of a firearm’s barrel, and consequently the width of the bullet. A larger caliber such as .308″ means the bullet is physically wider than a bullet such as a .22″. Larger caliber bullets can cause more damage and generally weigh more; however, caliber only describes the bullet size but provides no information as to the cartridge’s speed or power.

Next, we need to understand what exactly a “cartridge” is, and how that differs from a bullet. A “Cartridge” refers to the entire firing unit: brass case, primer, gun powder, and projectile. The word “bullet” only refers to the action projectile that is shot through the barrel and hits the target.

Now that you understand that, things will start to make sense. Let’s take an example. The .308 Winchester and the .300 PRC are both the exact same caliber. They both shoot a .308 caliber bullet. Don’t be confused by the names of cartridges. Sometimes they round things off to make a nice marketing name (such as the .300 PRC when it’s really a .308) and sometimes they use other ways to measure so they can have a nice-sounding name.

Both the .308 and the .300 PRC can shoot the exact same bullet (projectile). For example, a 180-grain GMX bullet could be loaded and fired out of either cartridge. Bullet designs are mostly interchangeable between cartridges of the same caliber.

However, the .308 Winchester case is much smaller than the case of a .300 PRC. Thus, the .308 Winchester case can’t hold as much gun powder, so when it shoots the projectile, it won’t cause as much damage to the target.

Now you’re ready to see some numbers. On this chart, you’ll see the name of the cartridge, the caliber measurement for that cartridge, then an approximation of how big of an animal that cartridge could kill (much of which is highly debatable), and how much average energy the cartridge would produce at a typical hunting distance of 100 yards.

CartridgeCaliberSuitable for Hunting Animals Up To…Avg Muzzle Energy
.50 BMG0.51Anything with a pulse12600
.458 Win Mag0.458Cape Buffalo5063
.45-70 Govt0.458Elk at short range3138
.450 Bushmaster0.452Elk at short range2810
.444 Marlin0.429Grizzly Bear3067
.416 Rigby0.416Cape Buffalo5166
.416 Remington Magnum0.416Cape Buffalo5123
.416 Ruger0.416Cape Buffalo5498
.378 Weatherby0.375Cape Buffalo6004
.375 Ruger0.375Cape Buffalo4780
.375 H&H Magnum0.375Cape Buffalo4560
9.3 x 62mm Mauser0.366Grizzly Bear4017
.35 Whelen0.358Grizzly Bear3932
.350 Legend0.357Deer at short range1907
.338-378 Weatherby0.338Grizzly Bear5035
.33 Nosler0.338Grizzly Bear4799
.338 Lapua Magnum0.338Grizzly Bear4851
.338 RUM0.338Grizzly Bear4694
.340 Weatherby0.338Grizzly Bear4674
.338 Win Mag0.338Grizzly Bear4164
.338 Federal0.338Grizzly Bear3340
.325 WSM0.323Grizzly Bear3596
.30-378 Weatherby Magnum0.308Grizzly Bear4666
.300 PRC0.308Grizzly Bear4246
.300 Weatherby0.308Grizzly Bear4092
.300 RUM0.308Grizzly Bear4135
.30 Nosler0.308Grizzly Bear4111
.300 Winchester Magnum0.308Grizzly Bear3827
.300 WSM0.308Grizzly Bear3718
.30-06 Springfield0.308Grizzly Bear3179
.308 Winchester0.308Elk2784
.300 Ruger (RCM)0.308Grizzly Bear2948
.300 Blackout0.308Hogs998
.30-30 Winchester0.308Elk1942
7.62 x 39mm0.308Deer1608
.28 Nosler0.284Grizzly Bear3678
7mm Weatherby0.284Grizzly Bear3482
7 STW0.284Grizzly Bear3458
7 WSM0.284Elk3255
7mm Rem Mag0.284Elk3122
.280 Ackley Improved0.284Elk2952
7 SAUM0.284Elk3004
.280 Remington0.284Elk2873
7mm-08 Remington0.284Elk2528
7mm Mauser0.284Elk2330
.27 Nosler0.277Elk3513
6.8 Western0.277Elk3011
.270 WSM0.277Elk3072
.270 Weatherby0.277Elk3176
.270 Winchester0.277Elk2862
6.8 Remington SPC0.277Deer1624
6.5-300 Weatherby Magnum0.264Elk3395
6.5 Weatherby RPM0.264Elk3098
6.5 PRC0.264Elk2780
.264 Winchester Magnum0.264Elk2766
6.5-284 Norma Match0.264Deer2462
.26 Nosler0.264Elk3125
.260 Remington0.264Deer2273
6.5 Creedmoor0.264Deer2231
6.5 x 55 Swedish Mauser0.264Deer1983
6.5 Grendel0.264Deer1447
.257 Weatherby 0.257Deer2675
.25-06 Remington0.257Deer2201
6mm Creedmoor0.243Deer2125
.240 Weatherby 0.243Deer2099
.243 Winchester0.243Deer1958
6mm Remington0.243Deer1953
6mm BR0.243Paper/steel 🙂1712
.22 Creedmoor0.224Coyote1769
.224 Valkyrie0.224Coyote1519
.223 / 5.560.224Coyote1499
.22 Nosler0.224Coyote1613
.220 Swift0.224Coyote1766
.222 Remington0.224Varmints1165
.22 Hornet0.224Varmints680
.22 WMR0.224Varmints276
.204 Ruger0.204Varmints1325
.17 Hornet0.172Varmints622
.17 WSM0.172Varmints398
.17 HMR0.172Varmints240

For many of you, that’s what you’re looking for. You want to know how powerful each cartridge is. But if you’re also looking for a conversion of caliber in inches to mm, the following chart should have what you’re looking for.

Rifle Caliber to MM Conversion Chart

Common Rifle Caliber NameCommon Metric NameBullet Diameter
.174.5mm.172″ (4.32mm)
.2045.2mm.204″ (5.2mm)
.22 (Long Rifle)5.56mm.223″ (5.66mm)
.22 (or .223 such as an AR)5.56mm.224″ (5.7mm)
.2436mm.243″ (6.17mm)
.25 (or .257)6.53mm.257″ (6.53mm)
.260 (or .264)6.5mm.264″ (6.71mm)
.270 (or .277)6.8mm.277″ (7.04mm)
.280 (or .284)7mm.284″ (7.21mm)
.30 (or .308)7.62mm.308″ (7.82mm)
.3258mm3.23″ (8.2mm)
.33 (or .338)8.6mm.338″ (8.59mm)
.3669.3mm.366″ (9.3mm)
.3759.5mm.375″ (9.53mm)
.41610.6mm.416″ (10.57mm)
.5013mm.51″ (12.95mm)

Pistol Caliber to MM Conversion Chart

Handgun CartridgeBullet Diameter in InchesBullet Diameter in MM
.22 LR.223″5.66mm
.357 Magnum.357″9.1mm
.380 ACP.355″9mm
.38 Special.357″9.1mm
9mm (Luger).355″9.02mm
.40 S&W.40″10mm
.44 Magnum.429″10.9mm
.45 ACP.452″11.5mm
.50 AE.50″12.7mm

Leave a Reply

Your email address will not be published. Required fields are marked *


  1. Jordan Emfield says:

    You have the 350 legend labeled as a 378 caliber which is the neck diameter not caliber

    1. Jim Harmer says:

      Thank you! I’ll fix that.

  2. Wes Stewart says:

    On your YouTube comparison of cartridges under 300yards you say the .350 Legend is barely enough for deer, but here you say it is ok for elk. Even if it is at short range … Really??

  3. Wes Stewart says:

    In your YouTube video on cartridges for under 300yards you describe the 350 Legend as barely enough for deer. Here you have it listed as enough for elk. Even at short range… Really??

  4. Abdul Khalique says:

    0.243 nice caliber🙂

    1. According to your chart above, the .30 caliber is a 7.62mm, but that is equivalent to a .308″ (7.82mm). Does a 7.62mm fit the same as a 7.83mm, or does one have to have guns made especially for those calibers! Thanks

  5. Matt Maxwell says:

    You forgot the 460 Weatherby Magnum. Why is that?

  6. “Bore” is a measure of the diameter or cross section of a bullet/projectile….

    ‘Caliber’ describes the combination of the bore and the cartridge-case….case design is closely controlled and affects the amount of powder that can be used, the length and weight of the bullet (projectile), the pressure developed inside the chamber…..

  7. Jim Smith says:

    I have ammunition with “PS 78” on the bottom of the bullet. what is it? I can send picture if needed, thanks

  8. Lisa Corbett says:

    My boyfriend has a rifle bullet that he can’t identify I am hoping that you may have an answer for him. The markings on the bottom part says, CA B44. Thank you for your time this means so much to me.

  9. Where is the 450/400 Nitro Express?

  10. Bob Dangler says:

    22 Savage High Power is .218″
    Bob Dangler

  11. Alan Thompson says:

    Hi – You have a typo for the 8mm row in the table – 3.23″ (8.2mm).

    Keep up the great work with all the videos & articles.

    Alan Thompson
    Carlsbad, CA

  12. This is a great list. Do you plan to keep it updated? Perhaps adding more obscure calibers (30 carbine, .303 British, 7.62 54r) or non rifle calibers (1oz 12 gauge slug, .357/.44 magnum out of a rifle barrel).


    1. Alex Morales says:

      How about 7.7 arisaka

  13. not sure where your getting your data from but how is 223 higher in energy than 6.5 grendel. Wish you had a chart with highest production ammo energy. Would be more useful and less misleading.

  14. What are the units on the average muzzle energy column? Foot-pounds? Joules?

  15. Paul Womack says:

    why have you left out the 30-40Krag on your chart

  16. Great, but I couldn’t get what I needed from this list. West Virginia hunting regulations State you have to use greater than 25 rimfire. I would love you to see you add 25 rim fire to the rifle list so I can see everything that’s above or below it. We have an ongoing debate whether that means you have to use bullets that are greater than .25, or if they’re somehow including power and velocity so something like a .223 centerfire could be used. Thanks.

  17. Steve Ellis says:

    On your calibre chart you have 257 with a metric conversion of 6.53mm, and 260 with a metric conversion of 6.5mm.
    How can this be??

    1. Jim Harmer says:

      Yeah, it’s insanity, but unfortunately correct. I’ve never heard of anyone call anything in 25 cal by a metric name. We only have a few cartridges like the 25-06 in that category anyway. So there really isn’t a “common” metric name. It’s just a straight conversion. Some of the measurements go by lands, other by grooves in what becomes commonly known, so anyway, it’s just an insane system, but it’s not a typo.

  18. Patrick Mcnulty says:

    I have an interest in rifles but very little experience. This article was really helpful. Thanks for breaking it all down.