Pellet drop

[Errol]

Hopefully this makes sense.
Has anybody tried this or has any info?
If four air rifles are zero's at 30 yards.
.177, .20, .22, .25.
What is the pellet drop at 40 and 50 yards with each calibre?
Many thanks Errol

[laverdabru]

One of the mags did a test with identical PCPs in all calibres a few years back- the manufacturer (AA or Daystate??) didn't make it in one of the sizes, did a special for the test.
No doubt someone more organised than me will point you in the right direction.

ATB

Bru

[Neil54]

Most people would direct you to Chair gun, a ballistics calculator.

I had no difference between a 10ft/lbs .177 and a 12ft/lbs .22 out to 45 yds.

[Portzy]

Hopefully this makes sense.
Has anybody tried this or has any info?
If four air rifles are zero's at 30 yards.
.177, .20, .22, .25.
What is the pellet drop at 40 and 50 yards with each calibre?
Many thanks Errol

Ideally you would need to punch all the pellet information into a ballistics programme, Hawke used to do one but I think they took it off line a couple of years ago

[rex]

Chair gun 👍

[angrybear]

Hopefully this makes sense.
Has anybody tried this or has any info?
If four air rifles are zero's at 30 yards.
.177, .20, .22, .25.
What is the pellet drop at 40 and 50 yards with each calibre?
Many thanks Errol

It depends on their velocity, two pellets at the same velocity will drop at almost identical rates regardless of calibre, because the gravity acting on them is identical, while difference in BC is so minor.
for any other situation it's impossible to answer because it depends on muzzle energy & pellet weight.

In the UK we have the 12fpe limit which is our control factor, thus we do not zero all 4 calibres at the same range because it's impractical, we tend to zero for the widest point blank range (PBR) where the pellet is never more than 1/2" above or below the line of sight of the scope,

so an example of PBR's for zero's taken from a test Phil Price did for AGW in 2010.
.177 = 8.8yds - 40.7yds with 31.9yd zero
.20 = 7.2yds - 25.9yds with 25.9yd zero
.22 = 6.7yds - 30.8yds with 24.1yd zero
.25 = 5.4yds - 25.1yds with 19.7yd zero

[bighit]

Field tester on YouTube from field sports Britain did a test the other week with .177 and .22 at different ranges .

Fieldtester, episode 6 is the one to watch for it .

cant link to it in case of dead stuff.

[TonyL]

There's a quite handy trajectory calculator on www.airguns.net/trajectory. You enter various parameters - zero range, scope height from bore, pellet weight, velocity, BC etc. Quite interesting to have a play and change the odd parameter to see what changes it makes. You can obtain the BCs for a wide variety of pellets from the hardairmagazine website. Yes, I know the BC will vary from gun to gun etc., but it gives a general idea.

P.S....That link will not work. I'm hopeless at doing links, but if you were to enter "airgun trajectory calculator" into a search engine, that will find it.

[ballisticboy]

The problem with using the ballistic calculators generally available is that the data is based on available pellets so you end up comparing different designs at the different calibres. Even when the pellets are called the same they are usually different designs which will affect your results.

It depends what you want to get from the results. If you just want to compare the different calibres with available pellets then obviously you can use things like Chairgun but the answer you get can be anything you want depending on the pellets you choose. If you want to compare the calibres firing identical pellet designs then you need different software not generally available.