Discussion in 'Benchrest' started by Graham freeman, Feb 28, 2018.
Very interesting, do you know what the twist rate is on the "air polygon"?
Looks very nice, what are the weaver t36 scopes like ?
Where did you get the barrel please.
YES WEAVER T36 SO GOOD
Lothar Walther gun and rifle barrels online shop - USA IT WAS A £135 ITS A BLANK YOU HAVE TO MACHINE IT YOUR SELF OR FIND SOME ONE
Thanks for the info. I am thinking of tying one on a Steyr. I can machine my own so that's one good thing.
one bit of info no crown just straight cut you can skim the outer edge but don't crown or it will shoot like a shot gun
Wow glad you said that I would have crowned it. Thanks looking forward to trying one.
Why? No expert but I thought a true crown was a prerequisite to accuracy.
a crown on a gun is to protect the end of the rifling where the pellet exits but on my gun it has a air striper so crown not required as the end of the gun is protected by the striper
It’s primarily to ensure the projectile leaves contact with the rifling at precisely the same point all round the edge of the muzzle. You said don’t crown or it will shoot like a shotgun. I was wondering how/why that would happen, assuming the crown was properly done.
its a polygon barrel and because I have an air striper there was no need to crown the end to have it done it will cost £50 if I was not going to use a air striper I would pay the £50 but its up to you
Will crowning ruin the accuracy ( shoot like a shotgun )
Did you try or did someone else ?
Or is your no crown policy because forbyour purposes it it not nrcesssary
no crowning will not ruin the accuracy just why spend £50 if your going to use a air striper as long as the end is cut correctly with out bures it well not affect accuracy
Little point crowning a BR barrel especially if you're sticking either a tuner or stripper on it, though my preference would be for a tuner...
These are great tuners:
Just got one of those for my Anschutz 54 ,if you've fitted one of these what method did you use to tune the barrell?
As with all of these mods you just have to start at zero, shoot a couple of groups (with a warmed up barrel), then wind it to the middle, shoot more, then wind to the end etc.
Decide which section seemed the most promising and then fine-tune from there comparing with a best group with no tuner.
There is no easy route and what might be a one-holer for a particular batch of ammo might be a shotgun for another batch of the same ammo, so if you find something that works buy plenty of the same batch.
Thanks for the reply, I initially tried Tony Purdys PRX method and tuned to the 9th harmonic but that put the tuner outer tube way over the inner tube .
I e- mailed Tony Purdy and found out that the PRX system does not work as well on 26 inch barrels! .
I would have to fit weight rings and turn the tuner towards it's middle settings
I was hoping to avoid having to use large amounts of ammo , oh well ! looks like that's the only option
Sorry ,I know this is not air rifle territory, just thought I would just ask
No problem, unfortunately there is no magic 'tuning fork' method, you have to shoot the lead, so it might take you a few sessions to really nail down the sweet spot of a particular node.
Also bear in mind that for a particular batch the nodes might be closer or further apart, so try and find the extent of the next node and note down the difference as the barrel might perform better. Keep notes on everything...
Thanks again , nothing's ever simple !