20 Calibre saves a lot of hassle discuss

[PCPShooter]

Gets out popcorn .......

[Rapidnick]

Certainly my favourite at legal limit. I find my rifles go really well with either FTT (11.4 grain) or JSB (13.7 grain).
At FAC power levels it is more clear cut in my experience. I set my rifle to produce 800 ft sec with the most accurate pellet which normally turns out to be the JSB 13.7 grain so making the power ~20 ft lb.
Crosman Premiers are problematic and I don't really know why. I find most barrels I have owned go better when paired with JSB. However if the Premiers go well for you they are devastating as the higher antimony content of the lead mix makes for a harder pellet.

[Geezer]

It’s marmite. Fans love it. A nearly 177 that hits nearly like a 22, or a nearly 22 that flies nearly like a 177.

Its critics say it combines the weaknesses of both more than their strengths.

I’m agnostic. I have 3, and like them. But, as a factual matter, demand for .20” on the U.K. and global markets has shrunk since a possible hey-day in the 80s and continues to reduce, and the number of available pellet types (though all good ones) has gone down in a few years from about ten to about five or six, and, in my judgment, is likely to get smaller not bigger.

I’ve said it before, but I can only see a resurgence of .20” if a possible lead ban made .177” much less viable as a pest control calibre than it currently is. Please though don’t derail this into a lead ban thread.

[angrybear]

While governed by the 12fpe law ALL calibres have to compromise on something.

.177 to be fast & flat must be light wt which reduces the energy the mass can carry so it loses momentum & terminal energy faster.
.22 due to the pellet mass hold's it's momentum & retains better terminal energy, but due to the limited muzzle energy has a far more pronounced trajectory curve.
.20 just happens to have a frontal area x mass that suits 12fpe far better than the others, giving a better BC, & terminal energy, So while it's still a compromise, as a sub 12 HUNTING pellet it's a better compromise than either one.

You only appreciate how good .20 really is when you actually go out & use it, in a properly set up rifle.

However once you remove the muzzle energy limit (FAC) .22 or .25 make more sense.

[gsxrman]

Yarn Yarn. Same old same old.
.20 is unnecessary and almost pointless.
For the flattest trajectory, tightest groups and more success on a FT/HFT course you choose .177.
For hunting of any power level, accuracy kills not size, so again the most accurate calibre, smallest groups etc .177 under 12ftlb.
FAC air .22 or .25, but I don't really see the point. If you need more range than FT ranges then use Rim or HMR.

[the growler]

The jsb 15.9grain pellet transforms the .20 in fac.

[angrybear]

The jsb 15.9grain pellet transforms the .20 in fac.

Well it might, but my point is a .22 or .25 shot at the same velocity still makes more sense

[rapidresponse1]

never hot on with my hw 100 in 20 cal

[angrybear]

Yarn Yarn. Same old same old.
.20 is unnecessary and almost pointless.
For the flattest trajectory, tightest groups and more success on a FT/HFT course you choose .177.
For hunting of any power level, accuracy kills not size, so again the most accurate calibre, smallest groups etc .177 under 12ftlb.
FAC air .22 or .25, but I don't really see the point. If you need more range than FT ranges then use Rim or HMR.

Except .177 is NOT "the most accurate calibre" because no 'calibre' is more accurate than any other,
.177 is simply advantageous to shoot because the flatter trajectory helps cover minor range estimation errors.

& frankly, if you "don't see the point" of FAC-air, you obviously don't know what you're talking about there's far more to it than just outright range.

Oh & "Rim or HMR" HMR is Rimfire

[gsxrman]

Except .177 is NOT "the most accurate calibre" because no 'calibre' is more accurate than any other,
.177 is simply advantageous to shoot because the flatter trajectory helps cover minor range estimation errors.

& frankly, if you "don't see the point" of FAC-air, you obviously don't know what you're talking about there's far more to it than just outright range.

Oh & "Rim or HMR" HMR is Rimfire

Sorry .177 is the most accurate in the sense that it produces the smallest groups. They are lighter so less variation of size and weight which all effect accuracy and grouping.

So out to FT range what advantage does FAC air give me?

Ok, my bad, I meant .22 Rim or .17 HMR

[--ped--]

While governed by the 12fpe law ALL calibres have to compromise on something.

.177 to be fast & flat must be light wt which reduces the energy the mass can carry so it loses momentum & terminal energy faster.
.22 due to the pellet mass hold's it's momentum & retains better terminal energy, but due to the limited muzzle energy has a far more pronounced trajectory curve.
.20 just happens to have a frontal area x mass that suits 12fpe far better than the others, giving a better BC, & terminal energy, So while it's still a compromise, as a sub 12 HUNTING pellet it's a better compromise than either one.

You only appreciate how good .20 really is when you actually go out & use it, in a properly set up rifle.

However once you remove the muzzle energy limit (FAC) .22 or .25 make more sense.

very well put