BIo Ammo hulls

[flippermaj]

Hi iPeter,

Thanks for that.   I have fired 1000's of eley eco wad steel carts and conventional steel plastic wad carts through my AYA.  Plus plenty of Duplex Steel no 2 and TSS 7 through it and a couple of steel\TSS home loads with fibre wad cups.  Never even used Mylar wraps on any loads!  A bit rash some may say but I haven't seen any scoring of the barrels.

If there is scoring should it be visible to the eye or do you need magnification gear to see it properly?

Cheers

[PeterHenry]

1 hour ago, flippermaj said:

Hi iPeter,

Thanks for that.   I have fired 1000's of eley eco wad steel carts and conventional steel plastic wad carts through my AYA.  Plus plenty of Duplex Steel no 2 and TSS 7 through it and a couple of steel\TSS home loads with fibre wad cups.  Never even used Mylar wraps on any loads!  A bit rash some may say but I haven't seen any scoring of the barrels.

If there is scoring should it be visible to the eye or do you need magnification gear to see it properly?

Cheers

You can see them with the naked eye, but its fairly difficult to photograph without a bore scope, which of course makes everything look significantly worse.

When I had them looked at, I was told they were only cosmetic - but not if they kept appearing.

My theory as to why some some guns can fire thousands of steel cartridges with no damage, and others seem to get scored in the first few shots is that there's a large variety of internal barrel profiles - different chamber lengths, forcing cone / choke profiles / internal bore diameters, etc.

If for example, there's a very steep forcing cone, I can see why steel pellets may push up againt / through the wads more so than with lead, that would likely deform / or than though a shallower profile.

Likewise, I can also see why pellets may push though gaps in a wad if it's got more give, having been fired in an over bored barrel.

Also, that if a 2 3/4" cartridge was fired from a 3 1/2" chamber, the gap up front may allow some pellets to escape the wad / the freedom of expansion at the end of the chamber then being compressed in the forcing cone may result in a pressure spike that causes the pellets to put pressure on / push though the wads.

So lots of variables - which the very general advice given out by various authorities don't really take into account.

Editted to add photos of the inside of my AYA's barells 

Edited 23 hours ago by PeterHenry

[flippermaj]

Some interesting pictures there!   I shall take a closer look at the AYA!

[PeterHenry]

32 minutes ago, flippermaj said:

Some interesting pictures there!   I shall take a closer look at the AYA!

👍