From what I understand elephant cartridges like .577 Tyrannosaur and the .600 and 700 Nitro Express are exempt from the destructive device registration.
For that matter rifled shotguns (besides .410) are as well. It is considered a sporting purpose exemption.
From what I have read you can use Bullseye smokeless powder in these. Over 1000fps with the magnum frame.
NAA specified in older manuals 1 grain in the small frames and 2 grains in the magnum frame. Eventually they dropped that data from the manual for liability reasons.
Something of note.
I got a Brownells 2019 catalog in the mail. I did not request one; perhaps they sent it because I have made several orders in the last few months.
As I was looking through it, I happened to find an ad for a Cav-15 MkII and MkIII lower. It said "NEW" next to the photo. Price...
Their Facebook has the latest info.
From January 17th: "Interesting developments, we have had to vacate our location. We are in the process of finding new space and will be transferring our FFL license's. We will be off grid until we get set back up."
Nothing since then. Not looking good IMO.
7.62x39 can do everything 300 Blackout can do. And it is more powerful.
The only thing the Blackout might be better for is using .308" diameter bullets.
Does anyone know why this was discontinued? Too hot? Looking at the reloading manuals I have, it seems difficult to match without going over max loads.
It out classed most 30-30 loads except maybe the Leverevolution. I killed a couple deer with it out of my CZ527. The discontinuation of this...
From what I understand:
Federally you can do anything you like to your own guns. Exception being making them into a machine guns or SBR/SBS without the proper tax stamp.
You can even make your own guns, from scratch or 80% receivers.
EDIT: I misread your question, but I still think you can do...
There is an aftermarket bottom metal made by DIPinc. It both fixes the weak plastic bottom metal as well as the magazine latch issue.
From their website: "We redesigned the magazine catch spring perch location to add a noticeable amount of tension to help prevent accidental magazine drops."...
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