Balistic Coefficient

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joeb33050 posted this 22 April 2016

No. joe b.

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Notlwonk posted this 22 April 2016

It depends on the distance to your target. The Ballistic Coefficient is used to calculate down range velocity, drop, wind drift, time of flight etc. At typical pistol ranges, <50 yds, it isn't particularly useful.

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358156hp posted this 23 April 2016

The BC of most common handgun bullets is similar to that of a brick.

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onondaga posted this 23 April 2016

JPnewhampshire wrote: I need to purchase a mold for the new 327 mag-- Lee lists there choices and shows the Balistic Coefficient for each of them// is this number usefull to me ?? Perry

Choose a bullet that first, fits your needs for the type of shooting you will be doing. I chose one of those same 3 bullets, the TL314-90-SWC. My choice on that one was due to the SWC design having a flat nose for game and a paper cutter edge that cuts perfect holes in targets. That bullet is also the simple tumble lube design that I prefer and it also has a beveled heel that helps loading. The TL314-90-SWC also casts the largest diameter in the caliber group, so that makes the bullet sizable for multi-purposes in 30-32 caliber rifle and pistol.

Those are a lot of features I appreciate. My application is different than yours for this bullet. I cast it in Lyman #2 Alloy and fire it at 1160 fps from a single shot Remington Spartan rifle in 7.62X39 with 3.9 gr. H TiteGroup. This is my squirrel and snapping turtle bullet. I also nailed one woodchuck at 60 yards on my pond dike. My load consistently groups under 1"@50 yards, and I hunt with it confidently.

So, just base your choice on what is important to your application. The B.C. of this bullet mattered nothing to me in my choice.

Gary

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Ed Harris posted this 23 April 2016

With handgun cartridges used at ranges which are almost always less than 100 yards, worrying about ballistic coefficient is pure mental masturbation. However, if planning to use handgun cartridges also in a RIFLE, particularly in low-velocity, subsonic loads, it is one useful consideration among many.

Most important is correct bullet fit. In a revolver a streamlined bullet shape is less important. In repeating rifles you want a profile which feeds reliably, is well guided by the lands, is properly stabilized at attainable velocity and which gives good accuracy and desired terminal performance.

Good terminal performance for hunting is best assured by a flat-nosed bullet having a meplat not less than half of the bullet diameter, but more ideally in the range of 0.6 to 0.7 of the bullet diameter. For short range use not to exceed about 50 yards, a larger meplat can be used, but dispersion will be nonlinear beyond about 50 yards or metres if meplat diameter exceeds about 0.8 of bullet diameter. Expansion of solid, flat-nosed cast bullets generally requires supersonic velocity using alloys not harder than about 12 BHN. Expansion of subsonic loads requires soft alloys in the range of 8-10 BHN with large meplat at least 0.6 of bullet diameter, aided by a shallow cup point if velocity is below 1000 fps. Suitable loads to achieve the above can be produced with easily obtained alloys and common powders by researching which bullets and loads work well for others, taking rudimentary measurements of your firearm, and making some basic educated decisions.

Before choosing a bullet it is necessary to know what firearm chambered in .327 do you have? If a revolver, knowing the cylinder throat diameter is most important.

Do you plan on using .327 brass exclusively, or do you expect to also use .32 H&R Magnum or .32 S&W Long brass, due to lower cost or easier availability?

Is this revolver primarily to be used for paper target shooting, or is hunting important?

Is your hunting use primarily for small edible game, or for varmints?

How important is limiting meat damage, noise, recoil, etc.

If small game hunting accuracy and economy are the primary goals, you don't need full power ammunition in your .327, but it is possible to load it to velocities approximating .32-20 or .32 H&R Magnum ammunition, which is very highly satisfactory for most uses. It is also possible to chose a longer-nosed bullet which is a good fit in the .327 cylinder when using less expensive and more plentiful .32 H&R Magnum or .32 S&W Long brass, which gives excellent performance comparable to .38 Special +P loads.

The Accurate 31-134D is one of my designs which I use in heavy .32 S&W Long ammunition for revolver and rook rifle, which should do splendidly in a .327 chamber using more readily available .32 H&R Magnum brass with about 7 to 7.5 grains of Alliant #2400.Overall cartridge length will then approximate that of .327 factory loads, but in the shorter case. I use this bullet in both rifles and revolvers chambered for the .32 S&W Long to approximate .32-20 energy. And yes, it has a good ballistic coefficient to retain energy at longer handgun distances.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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31-134D-D.png

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JPnewhampshire posted this 23 April 2016

Thanks all for the info// the project is to aquire a home defence weapon for the wife. On order is the Ruger LCRX in 327 mag-3” bbl. looks like another 3-4 Mo till they get them out so I bought the LCRX in 38 special for myself and for her to practice with some lite loads-The dealer will exchange the 38 for a 327 for a reasonable price --I also have 3 daughters awaiting the results for all this to Maybe buy 3 more 327s. Perry

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Ed Harris posted this 23 April 2016

Unless you already have a good supply of factory ammo in .327, the .38 Special might be a better choice, as a variety of effective, light recoil defense loads exist in 110-135 grains, and target wadcutters do well from short barrels.

Full loads in the .327 probably produce sharp muzzle blast and flash from small handguns, and in my opinion the .38 Special would be about as effective and more pleasant to shoot. A good argument can be made for using factory loads for carry and .38 Special is plentiful and available everywhere.

Maybe a .327 ammo tree grows near you, but I've never seen a factory round for it in my LGS....

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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norm posted this 23 April 2016

I had a chance to shoot a few 327 Federal factory rounds from my brother's Charter Arms Patriot, the one with the light frame. Plenty of muzzle blast and what really surprised me was the amount muzzle jump. Because of the cost of factory loads my brother only let shoot a few rounds.

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JPnewhampshire posted this 24 April 2016

I read that Hornady or other MFG has produced a new powder for the 327 with short BBls ?? I am now set up to load 32 mag rounds (100 new cases and a Lee dbl 90 Gr slug mold. I also can buy 100 90 gr jacketed HPs to load for defence loads--so the little 32 can handle light 700fps up to 1500-1700 fps// I loaded and shot 38+p in my Ruger Blk Hawk for 30 yrs. kinda like to try something new Perry

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tturner53 posted this 25 April 2016

It sounds to me like you are a lucky man! Daughters and wife on board for shooting is a good thing. My only contribution to this topic is something you've already touched on- muzzle flash. It can't be eliminated as far as I know but reducing it is good. One shot in the dark is enough to cause serious vision loss. A snubbie is a snubbie. EDIT: I've gone over to the “full charge wadcutter” type loads for my EDC old Charter Arms .38 snubbie. I have armed my daughters and wife but not for small concealed carry size. Let us know how this pans out. I'm going to start another thread re. muzzle flash.

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Balistic Coefficient

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