oteroman Posted March 18, 2019 Share Posted March 18, 2019 Ordered one for a Nordic. Curious if anyone had feedback, and what powder/bullet combo. Sent from my iPhone using Tapatalk Pro Link to comment
Bwillis Posted March 18, 2019 Share Posted March 18, 2019 Mbx knows how to design a comp where most others don’t. Whatever bullet you use don’t use fmj or coated it will clog the comp and it’s a pita to clean out. Ill elaborate on the comp, mbx uses channels facing rearward, when the explosion of gas comes out it drives the gun down. Most companies base comps with the gas coming out as aerodynamic. It’s an explosion of gas not aerodynamics. Link to comment
phoenixsomd Posted March 18, 2019 Share Posted March 18, 2019 My experience the the MBX comp (I have their PCC) was it didn't seem to affect muzzle movement much when shooting a 147gr bullet that made a PF of 135K. Once I moved to a 115gr bullet making the same 135K PF, I perceived a smaller muzzle/dot movement with an increased amount of felt recoil. I'm using Alliant e3 powder, 3.7grs for the 115gr Berrys bullet IIRC.Sent from my SM-G935V using Tapatalk Link to comment
oteroman Posted March 19, 2019 Author Share Posted March 19, 2019 Bwillis- what type of bullet??I think you were trying to say no coated bullets due to buildup in comp?Sent from my iPhone using Tapatalk Pro Link to comment
oteroman Posted March 19, 2019 Author Share Posted March 19, 2019 Bwillis- I got, no coated or exposed lead. Got it. Sent from my iPhone using Tapatalk Pro Link to comment
Bwillis Posted March 19, 2019 Share Posted March 19, 2019 (edited) I use jhp, cmj or plated. I like 115 because it’s snappy recoil. Powder and bullet weight are user preference everybody likes something different. To work the comp gassy powders are better wsf,hs6, accurate 5 to name a few I’ve tried. The picture below is the lead I cleaned from my comp after using fmj. It took me two days of letting soak in a ultrasonic and chiseling out. Weight is listed in gn Edited March 19, 2019 by Bwillis Link to comment
oteroman Posted March 20, 2019 Author Share Posted March 20, 2019 What PF are you running with HS6?I have AA7, CFE Pistol and maybe Longshot I will try with 115gr. HP’sWith a 16” barrelMy only priority is for the dot to return as fast as possible. Minimal movement is nice. Sent from my iPhone using Tapatalk Pro Link to comment
Bwillis Posted March 20, 2019 Share Posted March 20, 2019 It was a friends load he used in his mpx with a tall wall mbx comp. 5.0gn hs6 135gn coated=145ish pf. This was tested before I had experience with leading from coated and fmj. Link to comment
2scoops Posted March 20, 2019 Share Posted March 20, 2019 Had a standard JP comp, swapped to a custom Briley comp, then back again to JP comp, then to MBX comp. Difference is really small but I believe the MBX comp is best. It’s only based on what I see in terms of dot movement and of course my grip style etc. Running 147gr plated and jacketed bullets Link to comment
oteroman Posted March 21, 2019 Author Share Posted March 21, 2019 My head is spinning still WTF:)What am I missing??? HELP!Is open pistol logic applicable to PCC or not???Right or wrong?To work any comp you need gas. You get more gas with more powder. You shoot a 115 vs. 147 to use more powder (more gas). Is the comp is designed correct that extra powder is turned into a flat shooter with minimal dot movement due to a well designed comp. so why run a comp and 147 gr. Bullet?Less powder= less gas=less comp efficiency. Am I missing something. I mean no disrespect to anyone that is happy with their PCC load. If you don’t run a comp or don’t care about making it efficient the I get a a 147gr. With a fast powder possibly. Trying to speed up my personal load development, is my goal with my new arrived today MBX Comp. thank you allInterested in best gassy powder for working this MBX comp withFMJ 115’sSent from my iPhone using Tapatalk Pro Link to comment
Bwillis Posted March 21, 2019 Share Posted March 21, 2019 (edited) Less powder-less recoil- the comp will be less efficient. But you stay flat. I don’t use 147 because I shoot uml and have to take shots out to 200 147s nose drive at 100 The number one way to tune your pcc is load to springs and buffer period. Xantos posted a formula in one of these threads to equate the force gas exerts on the comp. Try messaging him for that formula. My load now is 4.6gn wsf 115jhp 1.12 oal-1210 fps 139 pf Edited March 21, 2019 by Bwillis Link to comment
2011BLDR Posted March 21, 2019 Share Posted March 21, 2019 14 hours ago, oteroman said: My head is spinning still WTF:) What am I missing??? HELP! Is open pistol logic applicable to PCC or not??? Right or wrong? To work any comp you need gas. You get more gas with more powder. You shoot a 115 vs. 147 to use more powder (more gas). Is the comp is designed correct that extra powder is turned into a flat shooter with minimal dot movement due to a well designed comp. so why run a comp and 147 gr. Bullet? Less powder= less gas=less comp efficiency. Am I missing something. I mean no disrespect to anyone that is happy with their PCC load. If you don’t run a comp or don’t care about making it efficient the I get a a 147gr. With a fast powder possibly. Trying to speed up my personal load development, is my goal with my new arrived today MBX Comp. thank you all Interested in best gassy powder for working this MBX comp withFMJ 115’s Sent from my iPhone using Tapatalk Pro "Is open pistol logic applicable to PCC or not???" It is in a Locked breach gun (MPX). Not so much in a Blowback as they are counter productive to each other. What drives the comp increases the bolt velocity and felt recoil in a Blowback gun, you can address that with system weight and spring rate Link to comment
MoRivera Posted March 22, 2019 Share Posted March 22, 2019 (edited) I've wondered before if that's what a comp is actually doing to the feel of the recoil (especially on a shorter 11-14" barrel).....a la, it's relieving the back pressure so it doesn't hurl the BCG back as hard/fast, and that's perceived as countering muzzle lift? Edited March 22, 2019 by MoRivera Link to comment
2011BLDR Posted March 22, 2019 Share Posted March 22, 2019 (edited) .. Edited March 22, 2019 by 2011BLDR Link to comment
assaultthesalt Posted March 22, 2019 Share Posted March 22, 2019 For what its worth, Im new to PCC and am shooting a MBX Pro Series with the 14" barrel and comp.I shoot for Orr Tactical Custom Guns and Ammunition. We worked up a PCC load based on felt recoil.We shot our standard 115 pistol ammo and were at 1297 fps w/ 147PF. We worked up a 100 grainer at 1310fps w/ 131 PF.While the 115's feel good , the 100 grainers feel a little more " carbine " like BUT with very little dot movement. Oh, Im running the Green recoil spring in my buffer system. As stated above.....it's more about personal preference on felt recoil. Link to comment
JZELEK Posted April 8, 2019 Share Posted April 8, 2019 On 3/22/2019 at 2:32 PM, assaultthesalt said: For what its worth, Im new to PCC and am shooting a MBX Pro Series with the 14" barrel and comp.I shoot for Orr Tactical Custom Guns and Ammunition. We worked up a PCC load based on felt recoil.We shot our standard 115 pistol ammo and were at 1297 fps w/ 147PF. We worked up a 100 grainer at 1310fps w/ 131 PF.While the 115's feel good , the 100 grainers feel a little more " carbine " like BUT with very little dot movement. Oh, Im running the Green recoil spring in my buffer system. As stated above.....it's more about personal preference on felt recoil. What powder and weight? Link to comment
assaultthesalt Posted April 8, 2019 Share Posted April 8, 2019 8 minutes ago, JZELEK said: What powder and weight? We're using a Berry's 100 grain hollow base projectile.Hodgdon CFE Pistol. I can't remember how many grains.Too many numbers running through my head. LOL I shot a match weekend beforelast and one guy on my squad said he was watching my gun as I shot.....He said he could see the gas coming out and the comp working , as the gun was running flat. Link to comment
NervousEnergy Posted April 8, 2019 Share Posted April 8, 2019 I'm running the MBX comp in the new barrel in my MPX (switched from a Taccom ULW with mid-comp), but with FMJ projectiles. May switch to TMJ, but the cost is substantially more. What did you use in your ultrasonic as the solvent? Link to comment
Bwillis Posted April 8, 2019 Share Posted April 8, 2019 @NervousEnergy Lucas ultrasonic cleaner is what I use. https://www.midwayusa.com/product/1094232149787/lucas-oil-extreme-duty-bore-solvent-and-ultrasonic-gun-cleaner-liquid Link to comment
mveto Posted April 8, 2019 Share Posted April 8, 2019 I run the MBX mid weight barrel that has the pinned comp. I use RMR 124gr jacketed bullets loaded with 3.9 of tightgroup and I really like the comp, it seems to really mitigate muzzle rise. I have no issues cleaning it, I use Slip 2000 Carbon killer and will just pretty much fill the mop up and let it sit for a few minutes then spray it out with an aerosol cleaner and it always removes any build up of carbon or lead that may be present. Link to comment
S&W627shooter Posted May 1, 2019 Share Posted May 1, 2019 On 3/19/2019 at 1:33 AM, Bwillis said: I use jhp, cmj or plated. I like 115 because it’s snappy recoil. Powder and bullet weight are user preference everybody likes something different. To work the comp gassy powders are better wsf,hs6, accurate 5 to name a few I’ve tried. The picture below is the lead I cleaned from my comp after using fmj. It took me two days of letting soak in a ultrasonic and chiseling out. Weight is listed in gn Have you tried running a drill bit through the comp to make sure the bullets are not scraping the comp? Mine had to be drilled out a little because the holes were not exactly even with the barrel. Link to comment
Bwillis Posted May 1, 2019 Share Posted May 1, 2019 @S&W627shooter I’ve never had accuracy issues with my mbx setup to think I needed to test for bullets striking the comp. The lead wasn’t even diminishing the guns accuracy, but my dot track was way off of what it should have been. I compared my comps inner dimensions to a new combs dimensions and realized I’m awful at cleaning guns. Link to comment
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