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Old 12-11-2016, 06:19 PM
visiter1 visiter1 is offline
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Default calliber diffrence

Hi lads ,
Can anyone tell me the difference between a 55 grain bullet in ,224
and the same bullet in a .243

I shoot a 6br with 75 gr bullets and thinking of going lighter to gain speed ,

any help would be aprecaited
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Old 12-11-2016, 06:26 PM
Daryl Daryl is offline
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If both .224 55gr. and the .243 55gr. are plastic tipped, they will almost have the same ballistic coefficient. There should be an advantage for the .224" bullet and there is, but it is so small - like .005 - you would never see it.
The BC's for both are usually in the mid .250's range.
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Old 12-11-2016, 09:00 PM
Alycidon Alycidon is offline
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Quote:
Originally Posted by visiter1 View Post
Hi lads ,
Can anyone tell me the difference between a 55 grain bullet in ,224
and the same bullet in a .243

I shoot a 6br with 75 gr bullets and thinking of going lighter to gain speed ,

any help would be aprecaited

Speed is something to brag to your friends about, accuracy is where its at.

6BR is a small case but the gain in speed coming down to a 55gr is not huge and not that notice able downrange. I shoot a 6PPC with 68s and 65s, I ease the load down a shade with the 65s to get the same bullet drops out to about 270 yards.

75s will drift less than 55s, and drift not drop is the main cause of misses.

55s will be a bit more 'disruptive' on smaller pests such as crows especially in a fast twist. On things like foxes it just depends if you catch a bone, one night I shot two 3 month or so fox cubs with 68gr Berger match bullets at about 100 yards. One shot sideways on boiler shot had a pencilled hole through, the other front on with its head down and I was slightly above it, bullet went between its ears into its spine from above in the neck, practically took its head off.


A
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Old 12-12-2016, 08:23 PM
UpNearTheBorder UpNearTheBorder is offline
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Just an F.Y.I. when cross referencing different caliber bullet weights then Sectional Density is the common denominator. Ex: 55gr .224 would equal a 65gr .243. Both are .157sd. This was extremely helpful when I had to come up with starting loads for a 6.5/06. I used both 270 and 25-06 published load data to get starting loads for the 6.5 to within 1 or 2 grains for the 06 case size. Calculator here: http://www.realguns.com/calculators/...aldensity.html
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Old 12-13-2016, 02:49 AM
GrocMax GrocMax is offline
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6BR can get a 55 NBT to 4000 FPS without moving the primer pockets.

55 22 cal NBT at 3500 and a 55 6mm NBT at 3500 the 6mm explodes PD's more better.
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Old 12-14-2016, 09:25 PM
Daryl Daryl is offline
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Also between 55gr. .224's and .55gr. 6mms - the slight advantage the .224 has in BC as to bullet drop and drift, is far offset by the increased speed of 55gr. in most any of the 6mm's - especially the larger ones like .243 and 6mm Rem.
Of course, there are even more advantages when talking about heavier 6mm's and heavier .224's - however the 6's have the greatest advantages, but of course, more recoil and probably barrel wear.
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