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jschroep

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Posts posted by jschroep

    New MBX Magazines that don't run out of the Box

    in Open Pistols

    Posted · Edited by jschroep

    My OAL is set a little shorter than the max that my gun will chamber and pass the plunk test. I could increase the OAL by a couple thou if you think that would help.  My understanding of what is going wrong in my gun came from YouTube videos on 2011 mag tuning from a reputable open gun builder. His information also lined up with what was presented in Dawson Precision's 2011 mag tuning guide. Is that approach not valid for MBX magazines? I am new to Open Guns and have two conflicting directions for tuning mags in the future. So forgive me if I seem completely confused. 

     

    Are the spring coefficient's the same between 140 and 170 magazines? I understand the whole force is a function of distance compressed thing believe me. I figured you would want the same force from a fully loaded 140 as a fully loaded 170. 

     

     

    New MBX Magazines that don't run out of the Box

    in Open Pistols

    Posted

    1 hour ago, CHA-LEE said:

     

    Did you read the thread I provided and do the testing suggested in there? If not, that is where you need to start.

     

    I also want to point out that just because a gun builder recommends an OAL for their build that is just a starting point. Every gun/mag/ammo combo is different and usually requires a unique OAL to feed reliably. You are finding out the hard way that shooting Open isn't the same as shooting a Glock where it will feed and eat anything. If EVERYTHING in your Open config isn't setup properly then you WILL have issues. There is no easy button to figuring this stuff or a magical magazine that will fix all of your problems for you. You need to put in the work to figure out what your gun needs to function reliably. Welcome to shooting Open!!!

     

    I read your post. When developing the loads I did the plunk test and found the Max I could load them was right at 1.168. I backed off on the OAL a bit to account for any variances in OAL and went with that. The gun and mags are on their way to Johnny. That's where I am getting the 1.155-1.165. with the majority being closer in the middle

     

    Do you have any ideas as to why 140's would work and 170's wouldn't? Especially given that the feedlips width was similar across the 170's and 140's from the start?

     

    Sorry if I made it sound like I ignored your advice.

    New MBX Magazines that don't run out of the Box

    in Open Pistols

    Posted

    I guess if I have to bang in the feed lips to get them back in spec I will. All I know is that 2 out of the 4 magazines I got didn't work out of the box period, after I spent 500 bucks on them. I kinda don't believe the whole oh the spring in the magazine is bad because it hasn't even been used. As far as the OAL goes Limcat gave me a load and said to use 1.155 OAL. I bumped that up and am getting 1.155-1.165 OAL with the majority falling towards the middle of that range.

     

    MBX is saying that it sounds like the gun is short stroking because of having  too heavy of a recoil spring on the gun. That explanation doesn't really make sense. I messed up in my initial email and told him both the 140's and 170's didn't work. It was mainly just the 170's that gave me trouble. Those didn't work with the 7lb recoil spring and bumping it up to a 9lb spring also didn't help. So I guess I'm confused about the short stroking issue. If it was short stroking wouldn't it be also having issues on the 140's with the 9lb spring? 

     

    I don't see the cause and effect. It feels like I got bad 170's and good 140's. 

    New MBX Magazines that don't run out of the Box

    in Open Pistols

    Posted · Edited by jschroep

    I sent an email and said what was going on. It's an open gun with 168-170pf ammo and a 7lb recoil spring. Gun wouldnt run the 170 mags and would hang up around the 6th to 8th shot. I switched recoil springs to a 9lb spring to try and overcome the round hitting on the ramp too low but nothing helped. Eventually I just switched to my 140's with a 9lb spring. 

     

    On a side note the 9lb spring helps alot with making the dot track a little better. 

     

    When I got home I took the match ammo and tried to see where it was hitting on the feed ramp. It definitely hits low on the ramp for all my mags. The fronts are much tighter than the back and I think that's making the rounds nosedive into the ramp. I'm pretty sure it's the mags.

     

    I think I was probably just lucky the 140's ran given the fact that they nosedive as well.

     

    Ill let y'all know what I find out from the builder and MBX

    New MBX Magazines that don't run out of the Box

    in Open Pistols

    Posted

    So I measured the feedlips and the fronts were .342-.344 (ish). The back was .346-.348(ish) these things did not run whatsoever. I went ahead and widened the front to .355 and left the back alone they seemed to work fine. 

     

    Has anyone else had issues with their MBX magazines not working well from the factory? 

     

     

    SV Infinity-thinking outside the box!

    in Open Pistols

    Posted

    8 hours ago, Nalle2491 said:

    I ordered my SV Infinity gun just last week. They're such innovators. I actually went to the factory and sat down with casey to build my gun. Wont be ready until Christmas or later, but will be worth the total wait. 

    It's "only" a 6 month wait? Wow that's not bad at all.

    Open Gun Complete! Waiting for delivery

    in Open Pistols

    Posted · Edited by jschroep

    7 hours ago, Nalle2491 said:

    It was between a limcat and an Infinity when i finally bought my open gun. Personally, I went with SVI, but damn, those Limcats sure do have some style about them. 

    The SVI's also look great too. I think I'd definitely look at them for my next open gun.

     

    I had someone ask why I got a Limcat over an atlas or a akai. He said something about how the Limcat costs so much more than the others. I'm not sure how true that is tho. When I checked the prices of the atlas chaos the my were pretty much in line with the Limcat and depending on what options were selected, the akai also was also similar. 

     

    Shot my first match with it yesterday. It was a 4 stage classifier match. So that was probably the worst one to decide to shoot. My first stage I forgot to turn on my dot and blew my first classifier. The rest of them I struggled to find my dot and stunk at every single one of them.

     

    I've only shot like 3 matches so far and knew I wanted to get into Open eventually. I figured I had the money to get into Open and took the opportunity when it presented. It is kinda annoying getting weird looks but quite frankly I just gotta learn to ignore the neigh sayers. Im hungry to improve and that's all that matters. I know im a better shooter than what I showed and just gotta push on.

     

     

    Open Gun Complete! Waiting for delivery

    in Open Pistols

    Posted

    17 minutes ago, usmc1977 said:

    Razor is a quality line of optic that Vortex makes. Razor does not make anything...so you can’t send anything back to Razor. You can send a Razor optic back to Vortex for repair...as with anything Vortex makes. Every optic company has some issue at some point...but see if you can get a 1 week turn around with them...like you can with Vortex. Once I had a 3-gun match and broke an optic in the match the previous weekend. Vortex shipped me a new one immediately before they even got the broken one from me. I had it in 3 days from the day I called them. I was able to shoot my 3-gun match the following weekend. Try finding that kind if service when you broke something and it was your fault.

     

     

    Sent from my iPhone using Tapatalk

    That's good to hear. I'm interested to see how it compares to my DPP

    Open Gun Complete! Waiting for delivery

    in Open Pistols

    Posted

    1 hour ago, Rugbyrat said:

    Funky looking. I love it. Here's hoping it shoots all A's for you. Can't wait to get one someday...

     

    Shoot A's quick. Newer to USPSA but had the opportunity to get one of these. Figure I can take a couple months to learn it and get up to speed. Hoping to take some clinics with an upper level GM pretty soon here.

    Open Gun Complete! Waiting for delivery

    in Open Pistols

    Posted · Edited by jschroep

    9 major. Would you go with something other than 340? 

    This was the autocomp load.

     

    124gr Berrys Bullets 9mm Hollow Base Heavy Plate
    7.0 gr Winchester Autocomp
    Mixed Once Fired 9mm Brass
    Oal Range 1.145” - 1.155”
    Winchester Small Rifle Primers

     

    124gr Montana Gold JHP .355
    6.9 gr Vihta Vuori N340
    Nickel Plated Once Fired 9mm Brass
    Oal Range 1.145” - 1.155”
    Winchester Small Rifle Primers

     

    that was the load they said worked good for them. They also mentioned autocomp which I have a lb of. I figured I'll try these at 1.155 and start around 6.0 gr and work up in .1 increments. Id imagine I could put the MG 124 JHP on top of autocomp without too much trouble. I looked into the burn rates and it seems that N340 is faster than autocomp. For 9 major you want a slower burning powder right?

     

     

    1 hour ago, Sarge said:

    I’m surprised they recommend 340. Is this a MAJOR gun?9 or 38?

     

     

    I guess I figured they'd know what works in their guns but I'm definitely open to suggestions. Want to be extra careful in developing loads so I'm sure I'll post my progress on load development.

     

     

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