Interesting accidental discovery...

[Shed tuner]

Been a bit windy down here but quite by chance I noticed something interesting when shooting with a couple of different rifles... one of them seemed to have very little windage by comparison - this was a BSA barrel fitted onto a rapid. It was a quicky job I did a while back, and upon closer inspection, I realised that the crown was not cut square - it was 5-10degress out (by eye).. and pointed to the RHS, into the wind as I shot along my garden... Now I'm thinking if the pellet is launching into the wind and this reduces it's windage, what about evelvation ? So I recut the crown, still around 7 degrees out, but this time pointed up, away fom the porting... so the pellet is now leaving the muzzle pointed slightly upwards...

It's not a massive affect, but I reckon with the same 30 yard zero, I'm taking about 1/2" less drop at 40 yards in a .22 Maybe time to experiment with more aggressive angles ? I guess the pellet is flying kinda nose up, a bit like skipping a stone accross a pond, rather than getting stuck in and dragged down ? Accuracy isn't quite as good either, but the trajectory advantage might be worth it

[Prone Shooter]

Been a bit windy down here but quite by chance I noticed something interesting when shooting with a couple of different rifles... one of them seemed to have very little windage by comparison - this was a BSA barrel fitted onto a rapid. It was a quicky job I did a while back, and upon closer inspection, I realised that the crown was not cut square - it was 5-10degress out (by eye).. and pointed to the RHS, into the wind as I shot along my garden... Now I'm thinking if the pellet is launching into the wind and this reduces it's windage, what about evelvation ? So I recut the crown, still around 7 degrees out, but this time pointed up, away fom the porting... so the pellet is now leaving the muzzle pointed slightly upwards...

It's not a massive affect, but I reckon with the same 30 yard zero, I'm taking about 1/2" less drop at 40 yards in a .22 Maybe time to experiment with more aggressive angles ? I guess the pellet is flying kinda nose up, a bit like skipping a stone accross a pond, rather than getting stuck in and dragged down ? Accuracy isn't quite as good either, but the trajectory advantage might be worth it

Not sure how that would stand up to HFT rules and adjusting your kit on the way round Jon. Seems a bit of a pain as well having to carry a hacksaw should the wind direction change

You might also run out of barrel on a very long course

Bob

[TonyL]

Apparently the difference is even more pronounced if loading the pellets backwards, Jon.

[Missed_dinner]

I just found bending the barrel over my knee a lot more effective and saves having the barrel get shorter each time.

[angrybear]

As would aiming the muzzle off in the required direction

Calling this one

[artschool]

guys you are all missing Jons point.

modern air rifles like the fx impact have interchangeable barrels.

that means you simply have to carry, lets say 5 different barrels each with a 5 degree change in crown.

you then choose the correct barrel for the conditions.