Which is capable of better BC? (.22 or .25 cal)?

[kaylaindy]

Questions:

* Which caliber is capable of a better BC? .22 or .25 (assuming you can push it as fast or slow as you want)

* ...or what actual pellet has the best BC in existence? Is it a .22 or .25? 

This all started when I saw a Joe B video showing he could shoot a super heavy .22 slug out of a Huben K1 at super sonic speeds...way faster than you would need. So then I wanted the MOST accurate Huben I could get...couldn't decide between .22 and .25...

Now the problem is spilling over into ALL my top end gun purchases. I want a Crown this week and so now I can't decide on a .25 or .22.

If the rifle was $300-$600 I wouldn't care which caliber...on a $2000 rifle I want to get it right. 

I'm anal about accuracy...so I want the BEST accuracy out to 100 yards. I'm talking 1/2 inch groups at 100 yards if possible...cost of ammo is not a factor. I prefer JSB's but I may get into buying slugs.

So I'm going to let BC decide. I want to pick one and stick with it. So what is the answer? .

* Better BC out of a .25 or .22? and * what pellet has the best BC? 

 Crown

Huben K1

Impact X

 

[AnimalHitman]

Great new topic, kay! BC is one of the most complex metrics in ballistics, yet the single most relevant number re accuracy. Virtually all other ballistic metrics are dependent on BC. Without an accurate and precise BC, a range card will be worthless. The BC for a particular projectile and weapon is a function of velocity, so it is critical that the BC used corresponds to the specific velocity of the projectile and characteristics of the particular weapon in issue. The BC can be determined only by practical means. Unfortunately, most shooters do not possess the laboratory resources necessary for the task. The proof is in the pudding. Once a range card has been drafted, the results must be tested by actual shooting. It will be interesting to follow the posts in this thread.

 

[addertooth]

Very short answer, assuming a .22 and a .25 caliber round is in the most ideal shape it can be (for the given velocity it is launched at), larger caliber will have the better potential BC. 

This does not mean all .25 rounds/pellets have a better BC than any .22 round. It assumes ideal shape and weight for the best possible result for that caliber. As diameter goes up, the potential for more mass accompanies it. Mass is one of the many critical factors for BC, and it strongly influence the entire result. 

 

[riazp]

Get the Impact X, in .25 or.30. Wait for the new slug liner .22 600mm! 

I have a crown, it is beautiful but not very portable, I feel like it is susceptible to more vibration than my Impact.

The Huben, while potentially a great rifle, should not be a consideration if .5 inch at 100 yards is your goal.

 

[D-RIG]

The 22 cal should have the better BC number .

And here are some BC numbers that I've gotten

from some slugs in 22 cal .



22 cal 24 gr BC .121 at 1,095 fps

22 cal 40 gr BC .117 at 935 fps

My 25 cal BC numbers are around .096 

 

[Spray1Mark]

If you want to shoot 100 yards regularly go .25.

 

[bdzjlz]

I have shot literally thousands of shots over the last decade, and while the maximum range distance I have is just over 80 yards, once I pass the 60+ yard range, the .25 will always be more consistent than the .22, especially if there is any wind, using the best proven performance round in each platform.

 

[likkitysplyt]

The best information I have been able to find on trajectory, BC, speed and mass is on the EDgun West web site. Go to the web site, click on the option at the top entitled "More", then click on videos, then scroll down to EDgun .22 vs .25 Part 2. The testing is done by Brian and the results may very well be surprising … stability. Hope this helps.

 

[BigTinBoat]

Without an accurate and precise BC, a range card will be worthless.

This is really odd. When I was in my teen I had absolutely ZERO clue at to what BC was. Had never even heard of it. I sighted in my gun and made a range card and it was DEAD ON from 25 to 100yards. What you're saying is that this was impossible.

 

[agnthooziast]

What would be awesome is to actually watch the pellets at very high resolution in slow motion with the sun coming from behind the shooter! All you need is a 55 gallon drum full of 100 dollar bills. Then get a camera that would stay focused on the pellet throughout the whole flight with a very fast motorized programmable zoom and focus or stitch several camera's footage. duh! : ) Seriously though less than perfect stabilization like wobble or yawing of the pellet from wind and or rpm along with pellet inconsistencies would effect the ballistic coefficient calculations. From the little I've seen wobble seems to increase with time until the pellet's waist catches enough air to buffer it to whatever degree somewhat like a shuttlecock. Bill 

 

[kaylaindy]

Awesome info! ...so I’m gathering that .25 will have a better BC if all conditions are right. I’ll probably go with .25. Here is a video I saw explaining some factors in BC. 

https://youtu.be/7IjK26Giaic