Taipan taipan slash - mag info

[rangur1]

Marek was very kind in providing me information regarding the slash mag diameters. I inquired about this because I am familiar with CZ barrel diameters. Now Steve of air velocity sport and one or two other ballistic guys basically have a consensus that a slug should fit the GROOVE diameter of the barrel, not the BORE diameter. They, and myself have spent significant time proving this out with my taipans, epic 2, kalibrgun cricket, vulcan 3. All use CZ barrels, all share same diameters. Those generally being:

177 - we don't have one
22 - .219
25 - .253
30 - .3063

Now I'm strictly focusing on slugs, any taipan will shoot pellets lights out. So, now to the point, taipan slash mags are:

177 - 4.49mm, 22 - slug 5.52 and pellet 5.54, 25 cal - 6.34 slug and 6.39 pellet, Nothing in 30 cal yet, but if they follow the same pattern 7.62 slug and 7.65 pellet.

Now doing the conversions Marek said make slug .01-.02 larger. So this is the conversions

177 - .177 - .178 diameter slug
22 - .218-.219 slug and .219-.220 pellet
25 - .250-.251 slug and .252-.253 pellet
30 - .301-.301 slug and .302-.303 pellet - 30 cal NOT confirmed, this is just my extrapolation based on pattern.

So, what's the problem? Well based on Me and my more learned buddies experience, Taipan has undersized their slug mag, it would use bore diameter where the slug barely engages the lands to provide spin on the slug. Leaves air blowing around the slug through the grooves, affecting accuracy. That's the position we have seen.

Where I diverge from my associates is here, on a standard repeater, the slug that is fitted to the groove as we like, you can feel resistance when it is seated in the lead in. The lands cutting into the slug. However, the slash is semi auto, it blasts the slug into the breach lead in. If it is too tight, can it get caught and mash up into a lump?

I know groove fitting is better than bore fitting with single shot repeaters. But physics may require differently in regards to semi auto. Maybe the accuracy of semi auto has been affected by these requirements.

below is a simple diagram, I'm no artist, the orange color represents the lead of the slug filling the groove of a groove sized slug versus the bore only on the other. NOTE - I KNOW, nice hair! LOL!

 

[imtrigerhapy]

Not to contradict but when I slugged my vulcan 3 hp .30 I sent 5 slugs to corbin and they told me mine was .3055 and another member came up with the same. They ordered dies and punches for .3063. I would either slug my barrel or test fire for accuracy before investing money and time for what should be the norm. Just a heads up my vulcan was purchased last december. I would hate for someone to order and wait and get wrong product. Morale of the story all berrels can be different if you are chasing perfect dimensions I would slug every barrel. Its imposible to know when tooling gets replaced form manufactures. New tooling equals my guess a larger bore old tooling prolly undersize. Just my guess and advice. Like backbones we all have them some just better than others

 

[MACTEN]

My Slash .22 slug mag doesn't like .218 at all. When loaded they are consistent over the chrono but no more than the .217's
This .218 diameter is the same slug that works well in my Taipan Vet 2 .22 and Epic Two .22. Both seem to have same barrel 550 un-ckoked as this Slash.
.217's do fit well but it still remains to be seen whether they perform well.

 

[rangur1]

Not to contradict but when I slugged my vulcan 3 hp .30 I sent 5 slugs to corbin and they told me mine was .3055 and another member came up with the same. They ordered dies and punches for .3063. I would either slug my barrel or test fire for accuracy before investing money and time for what should be the norm. Just a heads up my vulcan was purchased last december. I would hate for someone to order and wait and get wrong product. Morale of the story all berrels can be different if you are chasing perfect dimensions I would slug every barrel. Its imposible to know when tooling gets replaced form manufactures. New tooling equals my guess a larger bore old tooling prolly undersize. Just my guess and advice. Like backbones we all have them some just better than others

That is interesting, perhaps CZ is running a new button for boring their 30 cal barrels. Yes, slugging the barrel is the way to go. I just mentioned to marek that historically, CZ had larger diameters than what taipan had been preparing for. Especially in 25 and 30 cal.

 

[rangur1]

My Slash .22 slug mag doesn't like .218 at all. When loaded they are consistent over the chrono but no more than the .217's
This .218 diameter is the same slug that works well in my Taipan Vet 2 .22 and Epic Two .22. Both seem to have same barrel 550 un-ckoked as this Slash.
.217's do fit well but it still remains to be seen whether they perform well.

I'm sorry, I read this 2x. When you say the .218 is not liked by your slash, how so? You say they are as consistent as the .217

 

[MACTEN]

I'm sorry, I read this 2x. When you say the .218 is not liked by your slash, how so? You say they are as consistent as the .217

I haven't been able to test at the range. The mag is too narrow to allow .218's into it without a lot of pressure.
My other 550mm cz un-ckoked barrel (epic, taipan vet II ... .22) like .218's
Assuming the barrel in the Slash likes .218's as well but they might even get sized down below .218 from the tight magazine and I have no idea if .217's would work as well as .218 (might)

 

[rangur1]

I haven't been able to test at the range. The mag is too narrow to allow .218's into it without a lot of pressure.
My other 550mm cz un-ckoked barrel (epic, taipan vet II ... .22) like .218's
Assuming the barrel in the Slash likes .218's as well but they might even get sized down below .218 from the tight magazine and I have no idea if .217's would work as well as .218 (might)

I'm not surprised at all. I am convinced most manufacturers think barrels are exact. I'm already considering using the pellet mags to fit bigger slugs. It's obvious they are looking to fit bore diameter.