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tag129

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    40 Open

    in Open Pistols

    Posted

    5 minutes ago, splashdown said:

    tag, I initially tried Silhouette and found it to be too slow.  By the time I got to major, there was too much gas going out the end of the comp which contributed to more recoil and muzzle flip.  Longshot was another slower powder, so I never tried it.  I landed on Power Pistol for my STI 40 Open and currently using CFE Pistol for my current Glock open gun which has a carver 4 chamber comp.  YMMV. It will depend on the length of comp, how many chambers and if you have any poppel holes in the barrel.  It could be a viable powder for you.

    My comp will look similar to STI Trubor comp with 2 additional bleeder each side.

    - top port will tilt back 10 degrees 

    - bleeders may be 20-30 degrees 

    - 3 (3/16"-5/32") popper holes on the barrel.  

    I don't know if that's too much or not, any suggestion? 

    Thx 

    40 Open

    in Open Pistols

    Posted

    1 hour ago, zzt said:

    tag, it depends on the shooter and the ports/comp.  The most important to me is the dot returns to the same spot in a straight up and down motion.  People swear that my gun recoils straight back with no visible muzzle rise.  There is some, because I can see the dot jump.  I chose Silhouette and WAC for that reason.  HS-6 feels softer, but the dot wiggles and I find that annoying.

    The second thing you have to consider is how the gas gets used.  If you have so much that it jets out the front of the comp, you increase recoil and hit your hand harder.  You can also have so much gas, used so effectively the muzzle moves down under recoil.  The first time that happened to me I was flabbergasted.

    slemmo, ouch on the 40 pricing.  I didn't realize you were in Europe.

    zzt 

    what is WAC powder? And what comp are you using? 

     

    40 Open

    in Open Pistols

    Posted

    Thanks guys. 

    I have loading data for longshot but don't have any info on N105. I want slower burning powder is because my comp is custom made and I will have 3 popper holes on the barrel. 

    Any suggestions? 

    Greatly appreciated

     

    9mm major gas vs 40 S&W major gas

    in Open Pistols

    Posted

    On 2016-10-31 at 3:33 PM, zzt said:

    tag, a chamber is formed when you cut into a comp to make a port.  A baffle is the forward face of the cut.  You may have more than one port cut into a chamber.  Take a look at the comp in the ChuckS post.  Starting from the rear of the comp you have one up port.  The front wall of that port is a baffle.  Next is another up port and the front wall of that second port is a baffle.  There are two more ports moving forward, and there is a baffle between each.  When we get to the next opening(s), what do we call them.  Yes, there are two ports, one on either side.  So you could correctly call this an 8-port comp, but that does not tell you the whole story.

    If you think of every division in a comp moving forward as a chamber separated from the next by a baffle, you give more information.  Chuck's comp is more correctly described as a 6-chamber, because it has six interior divisions and therefore six baffles.  The first four chambers have one up port each.  The next two chambers have two side facing ports cut into each, one on each side.  So it is a 6-chamber, 8-port comp.  That tells you how the comp is configured even without a picture.

    Assuming there is enough gas to work them, the more baffles you have, the softer the gun shoots.  The more ports you have, the more gas you can produce and vent out the top or sides so none exits the front.  Gas that exits the front of the comp increases felt recoil.  Gas that hits the baffles reduces felt recoil.  Gas that exits up reduces muzzle rise.  Gas that exits sideways does not affect recoil, but that gas pushing on the baffle does.

    Thx zzt 

    i will try to develop a load first than I will start on the comp.  

    9mm major gas vs 40 S&W major gas

    in Open Pistols

    Posted

    On 2016-10-31 at 0:11 PM, Reshoot said:

    The biggest problem you will encounter, with 40 caliber and a compensator, is too much gas. I worked on 40 open loads for an entire summer and still never really got it right. 

    Fire a round at a cardboard target, with the end of the comp 2 inches away from said target. You should have a clean bullet hole, and perhaps a bit of powder residue around the hole. Good luck reducing the amount of gas to where the target does not tear. I got to a point where the 2 ~ 3 tears were 1/2" long and could never get it any better. But then, with my initial loads I was getting 3 tears in the target 2 ~ 2 1/2" long. 

    Thx reshoot 

    9mm major gas vs 40 S&W major gas

    in Open Pistols

    Posted

    1 hour ago, zzt said:

    I too spent a lot of time working up loads for 40 Major Open.  My current load is 155 Rainier bullet over 7.1gr Autocomp.  It shoots flat.  Most observers tell me the muzzle doesn't rise at all.  It does, but not by much.  This is the newer gun with two poppels and the comp.  It mostly recoils straight back and is harder on the hands than my older gun.  The reason is not enough gas to work the comp.  No, or almost no gas exits the front of the comp.  Moving to 8.2gr and the 135 Rainier makes more gas, but is deafeningly loud.  Same if I go to HS-6.  I need a grain more to make the same PF with the same bullet weights, so I get more gas, but even more noise with it.

    I'm going to continue to experiment over the Winter.  I bought a new comp.  It is the EGW Ti comp designed for Bianchi cup or minor.  It has 5-chambers and 7-ports.  I'm hoping the extra baffle will  soften the hit to the hand.

    I always get mixed up. Ports located on the top and chambers located on the sides. Am I correct? 

    Is baffle same as chamber? 

    9mm major gas vs 40 S&W major gas

    in Open Pistols

    Posted

    1 hour ago, Reshoot said:

    The biggest problem you will encounter, with 40 caliber and a compensator, is too much gas. I worked on 40 open loads for an entire summer and still never really got it right. 

    Fire a round at a cardboard target, with the end of the comp 2 inches away from said target. You should have a clean bullet hole, and perhaps a bit of powder residue around the hole. Good luck reducing the amount of gas to where the target does not tear. I got to a point where the 2 ~ 3 tears were 1/2" long and could never get it any better. But then, with my initial loads I was getting 3 tears in the target 2 ~ 2 1/2" long. 

    What kinda comp are you using? 

    9mm major gas vs 40 S&W major gas

    in Open Pistols

    Posted

    On 2016-10-23 at 7:49 AM, zzt said:

    tag, it may be possible to do that using only a comp.  I tried doing that with my first Open pistol.  It was 40sw and originally a 3-chamber, 3-port design that I later modified.  It ended up being 3-chamber, 7-port with the extra 4 ports being side bleeders.   One particular load using a 155gr and HS-6 made 172PF and was stupid soft.  If you didn't hear the loud bang when it went off, you would swear you were shooting a 22LR.  To get that combo to shoot FLAT, I had to go up to 188PF.  That was incredibly loud and hard on the hands and the gun.

    My second Open pistol is also 40sw.  I has two 3/16" poppels and a 4-chamber, 5-port comp.  It shoots flatter with the same loads the old pistol used.  With some additional tinkering and a comp change I'll be able to get it to shoot flatter, or softer, but probably not both.

    Recoil with either Open load is less than with my old Limited load of 180gr @ 172PF, so I have plenty of room to go for flatter rather than softer.  I'm fine with some dot lift, as long as it settles back down in the same place.  A fast split, at least for me, is 1 second, so there is plenty of time for the dot to settle before the second shot.

    BTW, I don't feel handicapped in any way using 40 for Open.  It is a straight walled case and using the Lee carbide bullet crimping and resizing combo eliminates concerns about Glocked brass.  No so with the tapered 9mm case.  Many are now finding a lot more Glocked brass than previously and are buying roll sizers to fix the problem.  That being said, my next Open pistol will be 9mm for no other good reason than I want one.

    ZZT 

    Thx for the info, im trying to make my own comp.  3 port on the top, 2 on each side and 2 popper holes on barrel.  

    Ultimately, I want the flattest and softest if  possible.    

    I'm using longshot with 135 gr berry bullet.   

    If you don't mind you can PM me  

    thx 

     

    Glock 35 9-40 barrel

    in Glock

    Posted

    Hi Everyone, 

    I have a Glock 35 and will turn it into an open gun. I would like to run 40 S&W casing with a 9mm bullet. 

    My question is, "Where can I find a barrel that will fit my application? Or who makes a 9-40 barrel?" 

    Reason is, I wanna have more powder options and I want my G35 to shoot as flat and as soft as possible. I wanna give those STI/Infinity guys a beating.   (Just kidding) 

    Any info would be greatly appreciated.  

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