I was shooting with some friends last weekend , and I now have some questions.
Anyway , we were shooting my CF-X near Hazyview , and yes, it was hot as hell. (And humid , there was a storm brewing)
So, there we were , shooting at a range of about 27 metres, using a deadrest, we were getting reasonable groups (I thought so anyway).
Then suddenly a few things happened, which puzzled me.
Everything happened at more or less the same time, read on ...
Firstly (or the first thing I noticed) -all of us were suddenly shooting very high (we were just clipping the top of the target in the pellet-trap, instead of dead centre )
Then I noticed that when the rifle was cocked, there was some grinding feeling during the last bit of the cocking stroke.
-I sprayed some Ballistol on the hinges I could see under the stock, but the grinding persisted.
Then suddenly I noticed when the rifle was fired , it sounded differently, the 'twang' of the reverberating spring was gone, I was left with only a 'thud' when the rifle was fired.
So, I took the stock off to see what was going on, and I noticed the CF-X has a hinge with two little metal wheels on both sides. (When the rifle is cocked, these wheels roll along, inside the stock on a little rail) , anyway , one of these wheels was off-round (I don't know how), and I assume this is what caused the grinding.
But then why were we suddenly shooting high ? I considered fatigue , by then we had spent about 5 hours in the sun, and as I mentioned , it was uncomfortably hot. But why did everyone ( we were 3 shooters) shoot high.
Can change in air-pressure affect the point of impact ? Obviously with the storm (which came and went) , airpressure also fluctuated.
And why did the sound of a shot being fired also change ? My guess whas that when I sprayed the Ballistol on the hinges , some must have gotten onto the spring , and this changed the sound.... ?
The point of impact slowly dropped again , but by the time we stopped shooting (the grinding was getting worse) we were still shooting a bit high.