Geissele Cut Rifled SPR Build and Barrel Evaluation. (Part 4 (Load Development 28MAY25) Update!!!
- Thread starter Bigjake83
- Start date
Maybe I’m stupid, but how does one go about re-contouring a gas tube? I’ve bent the tail end that enters the BCG for less interference with the gas key, but not the area over the nut.
Side note: I see strong merit in straight gas tubes, such as KAC.
Those new 18" SPR cut-rifled barrels from Geissele sound impressive. The combination of single point cut rifling, 416 stainless steel, and their 3-port phased array gas system seems like it’s built for both accuracy and reliability.
Are you a bot ?
Great thread, thank you.
@Bigjake83 do you have any dimensional info on this chamber? I didn't see that in this thread but is it a Wylde? I've got my dies setup for sizing to a CLE chamber and am curious how different this may be. Thanks.
@Bigjake83 do you have any dimensional info on this chamber? I didn't see that in this thread but is it a Wylde? I've got my dies setup for sizing to a CLE chamber and am curious how different this may be. Thanks.
That isn't really how dies work. The only thing you can adjust when "setting up your dies" is shoulder bump or rough equivalency to headspace. Chambers that were cut with the same reamer will have differing shoulder bump requirements most of the time. The only correct way to answer your question is using this
, on brass fired in the specific chamber of the Geisselle barrel you buy and then comparing it to what your die produces after sizing. No one makes 223 CLE dies or 223 Wylde dies. The biggest difference is the freebore and has nothing to do with dies or die adjustment.
Beat me to it. If I remember correctly the freebore on a CLE is a bit shorter than a Wylde which is shorter than a Match.That isn't really how dies work. The only thing you can adjust when "setting up your dies" is shoulder bump or rough equivalency to headspace. Chambers that were cut with the same reamer will have differing shoulder bump requirements most of the time. The only correct way to answer your question is using this
View attachment 8749040
How much bump do you guys use when hand loading for an AR? I've always used -.004" for gas guns, I've never experimented with lessThat isn't really how dies work. The only thing you can adjust when "setting up your dies" is shoulder bump or rough equivalency to headspace. Chambers that were cut with the same reamer will have differing shoulder bump requirements most of the time. The only correct way to answer your question is using this
View attachment 8749040
The CLE chamber dimensions are a little different than a Wylde at the shoulder and neck base. My sizing die is currently setup for minimum bump on my CLE chamber, which would be excessive on a Wylde, checked using a CLE provided headspace guage. For the freebore you are correct though, it's much shorter on the CLE.That isn't really how dies work. The only thing you can adjust when "setting up your dies" is shoulder bump or rough equivalency to headspace. Chambers that were cut with the same reamer will have differing shoulder bump requirements most of the time. The only correct way to answer your question is using this
View attachment 8749040
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Thats correct, the CLE Match Chamber was basically designed around the 77gr SMK, it also likes the 60gr Vmax.
Do you have any observations on brass re-sizing for this Geissele chamber vs a CLE?
No.... fire some ammo through it that has the brass you plan to run, then set your FL Die to bump the shoulder .003
This should honestly be your procedure for any PRECISION Gan Gun.
Also make sure to check neck tenion, if it's too loose the projectiles will slide forward jamming into the lands.
I do this by making some dummy rounds with the resized brass and chambering them with the bolt release a few times to make sure nothing has changed your COAL.
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