I dunno, I go on holiday for a week, and everyone gets excited about the small bore guns being hold sensitive, Is it time for me to say tell you "told you so" JB.
I don't have access to fancy test equipment, but I do test consistantly every time , and not taking anything away from the other shooters or their shooting disciplines, but I am looking for an edge in Ft so my big scopes at high mag ,and unwieldy stocks, when shooting off the knee do show up any improvements or otherwise in the tunes that I try, and I am like a dog with a bone if I cant get some thing to work.
My 25mm pistons are a lot lighter than the norm I run them at 175 gram, the reason I can do this is I think is the o ring, the cycle is not as soft as some , but that's not in my criteria, I don't call it "hold sensitivity" I call it sight picture movement, the less movement I get , in the sight picture , the more I hit , and whats more the easier it is to do so , simple as that.
I have found that the 21mm and 23 mm tunes I have shoot better in the longer barrelled guns , I am not sure if this is because of the longer time the pellet has in the barrel, or because of the up front weight, so next up is a weight to add to the end of the Hunter carbine , then I have a plan for a tx bull pup, to move the weight back and try to reduce the barrel movement further.
I have run o rings in 26mm 25 mm 23mm and 21mm, at 25mm and above detonation is not a problem at any power up to 12 ft lb, its only when you get down to 23mm that it becomes a problem, and not just a bit of smoke , one shot it makes the power then all the lube gone and nothing. I think the pressure in the cylinder must provide conditions that are just too close for comfort for combustion, ok in a diesel engine but not an air rifle,
All good fun looking for the ultimate in air rifle design, but I am starting to to think we may be closer than we realise.
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Originally Posted by NickG
