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Firearms >> Other Firearms >> Arisaka T-99 Mystery
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Message started by psteinmayer on Mar 28th, 2017 at 4:26pm

Title: Re: Arisaka T-99 Mystery
Post by Parashooter on Mar 28th, 2017 at 11:49pm
Cures for "blow-by" -

Anneal case neck/shoulder.
Seat bullets deeper.
Faster powder.
More powder.
Longer/heavier bullets.
Flat-base bullets.
Trim cases as long as chamber will allow (by chamber measurement*, not "book" dimension).

Basic problem is that the bullet "uncorks" the case before neck/shoulder has expanded enough to seal chamber. We can speed up expansion or slow down bullet exit to cure it.

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*Expedient method to determine chamber length. Fired case seats buckshot into chamber, leaving impression of mouth.

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