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Open beta for a 300 Blackout Long variant in the HubTN.4 series. Basically the same as the 9mmL but sized for 30cal and with some new helical porting in the endcap. Cores come in HUB as well as 3/4x16. Sleeve options are Form 1, non Form 1, and blank.
v2 Update: The threads were missing from the Core-HUB file and are now present.
v3 Update: Included a slightly thicker sleeve option (still not as mush as what's on the 556 sleeves) that can be tried for potential use with supers. This is untested as of yet. Updated to an improved version of the HUB threads as well.
v4 Update: Large improvement on HUB threads incorporated.
v5 Update: Small improvement to HUB threads; should be the last update for them.
v6 Update: Small weakness I found where part of the first baffle didn't quitee get all the way to the inner core wall. Haven't heard anyone having an issue so far but now it's fixed. Also added a better DT file that extends engagement length of the threads by a good bit.
Name Update. "300blk L" added as part of title to aid searching. Files are unchanged as of yet but testing has shown that this design (using the original UN-thickened sleeve) handles supersonic rounds. It's unclear if there's a limit to this. The thickened sleeve file remains present however for if a limit to supers use is found and is unsatisfactory.
LBRY Tags: hubtn.4; ftn.4; fosscad; 3d print; 300 blackout
v2 Update: The threads were missing from the Core-HUB file and are now present.
v3 Update: Included a slightly thicker sleeve option (still not as mush as what's on the 556 sleeves) that can be tried for potential use with supers. This is untested as of yet. Updated to an improved version of the HUB threads as well.
v4 Update: Large improvement on HUB threads incorporated.
v5 Update: Small improvement to HUB threads; should be the last update for them.
v6 Update: Small weakness I found where part of the first baffle didn't quitee get all the way to the inner core wall. Haven't heard anyone having an issue so far but now it's fixed. Also added a better DT file that extends engagement length of the threads by a good bit.
Name Update. "300blk L" added as part of title to aid searching. Files are unchanged as of yet but testing has shown that this design (using the original UN-thickened sleeve) handles supersonic rounds. It's unclear if there's a limit to this. The thickened sleeve file remains present however for if a limit to supers use is found and is unsatisfactory.
LBRY Tags: hubtn.4; ftn.4; fosscad; 3d print; 300 blackout
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