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Ballistics by the inch (10mm and others)

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I have been in search of info how much gain I would see plopping $235 down for a 4.5" barrel and slide to replace my 3.6". Thanks to these guys I have that info although I'm on the fence if it is worth it???

 

http://www.ballisticsbytheinch.com/10mm.html

 

 

May be a good one for a sticky or so others will know. Seems most ammo is rated on 4.5" barrel but I did find Hornady uses 5" so those box numbers won't match up to a 4.5" Chrony number.

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good find. It seems that I am loosing less than 90FPS using my 4.25 inch rather than a 5 inch on my 1911.

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Any opinion on whether it is really worth it going from the 3.6 to the 4.5?

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Any opinion on whether it is really worth it going from the 3.6 to the 4.5?

I guess it depends on what you are shooting at and how far away it is.

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I don't hunt anything with my pistols (my state has standards of 6" barrel and min muzzle velocity) which only a 44 Magnum could meet. All of them are home defense and practice.

 

 

 

As it turns out going to the 4.5" barrel I could only get a blued slide. I wouldn't have the Wonder Finish look anymore.

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For now let's pin it.

 

Barrel length vs. velocity is a common question that pops up fairly often. Especially among new shooters and handloaders.

 

I often use this data as a general guide for my factory and handloads.

 

I have found as a general rule one easily gains 100-125 fps when using safe full power handloads between the G29, G20 and a G20 with a 6" barrrel.

IOW, the the G20/6'' gains nearly 200 fps or more over the G29.

Factory loads can be much less though.

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So in my situation does that .9" of barrel length make any sense?

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So in my situation does that .9" of barrel length make any sense?

Not for CCW use. At least IMHO.

When I carry my G29 I am not thinking about velocity loss. Especially with 155's around 1345 fps for 620 ft/lbs.

Plenty nuff' :thumb:

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Here are our numbers for different barrel lengths, hope it helps. These numbers where all generated at the same time with the same lots of ammo, so there is no lot to lot and environmental variances to worry about.

 

 

165gr JHP

S&W 610 6.5 barrel 1460 fps 787 ft. lbs energy

Witness full sized 5 barrel comped 1400 fps 723 ft. lbs energy

Witness Compact 3.5 barrel 1270 fps 591 ft. lbs energy

 

200gr CMJ

S&W 610 6.5 barrel 1295 fps 745 ft. lbs energy

Witness full sized 5 barrel comped 1290 fps 739 ft. lbs energy

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So from 3.5" to 4.5" barrel it would probably go from 1270 to 1350. That's not huge is it?

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that is about right.....for every 1" of bbl, you can add or subtract approx. 100 f.p.s. depending which way youre going....

 

 

also when using a wheel gun, the cylinder is often left out of the bbl length....

 

a 1911 with a 5" bbl is everything from the back of the bullet at the primer to the crown of the bbl.

 

 

a revolver with a 4" bbl is actaull 5.5" because you have to count the chamber that the bullet is in like you did with the semi auto. to be fair i mean.

 

a 5" 1911 and a 4" 625 have about the same amount of bullet launching pad if you will.

Edited by JERRY S.

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I need a chronograph so I can figure out the difference between my 5" and 6" 1911 10mm pistols.

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