bullets tipping from 9mm Jericho

[Dick Ozinga]

My gunsmith has been tinkering with this Jericho for some months now, but can't find the cause for bullet tipping from my Jericho. The 9mm barrel will not produce groups and even has bullets tipping at 25m, The 41AE barrel works fine as far as I have been able to determine.

So far we have tried:

- 115, 125 and 145 grs bullets in reloaded ammo in 356 and 355dia

- differerent factory loads: Geco, Magtech, Fioggio etc

- barrel replacement

- recrowning the barrel

- checking headspace

Any thought beside selling the gun of changing my smith:) Replacing the spring?

TIA,

Dick

[Bob DuBois]

Slug the barrel with a new lead bullet then measure to see what bullet size will fit the barrel, may have enough wear to need replacement.

[Dick Ozinga]

Slug the barrel with a new lead bullet then measure to see what bullet size will fit the barrel, may have enough wear to need replacement.

Barrel was replaced with factory replacement barrel. At first we thought is was the porting that was bad, but the problem stayed even without ports and I was €200,- poorer:)

[DownUnder]

Why are you testing using smaller diameter projectiles? If a projectile is undersized it will not spin stabilise, resulting in instability during flight. Try Bob's idea above, or try some .357 projectiles and see if there is a difference.

Edited December 4, 2012 by DownUnder

[practical_man]

Dick

You are getting some good advice. If the barrel crown nod lands are good then you need either a larger diameter lead bullet or drive it faster. If you are shooting jacketed bullets try shooting them at 125 to 135 PF. They should not keyhole

[Flexmoney]

Are those bullet true metal jackets, or plated?