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Old 29th January 2016, 01:43 PM
verminator verminator is offline
Join Date: May 2010
Member of: Bisley
Location: London
Posts: 94

Originally Posted by Adam View Post
As stated the rifleman's rule is an approximation, a rule of thumb; easy to remember and apply. I believe it originated when the typical scenario was using rifles at long ranges using open sights. In that environment, the sight line to bore distance becomes an insignificant part of the equation.

The problem with it is it isn't a good approximation at short ranges and with high sight lines, both of which apply in airgunning using scoped rifles.
Right, it completely fails below 15 yards. To be honest I had not heard of the 15s rule until this discussion and I thank the forum members for their patience explaining it to me. I have always measured it.

The 15s rule is clearly a good approximation and will do for most, but what I'm after is an accurate mathematical model that works from 8 yards onwards.

The discussion on this forum has given me some ideas for further investigation, I just wish the wind would go away.

Originally Posted by Adam View Post
Having thought about the bendy barrel thing, to be fair I think this is not so worthy of ridicule; it is something that might have a small effect. It's certainly not the cause of the issue but a free floating barrel will flex very slightly under its own weight. I remember shooting my HW100 with and without the moderator and the POI was an inch higher at 30 yards without the mod.
Well at least someone agrees
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