Texas', it won't cycle ALL 147gr ammo? Or just some or one load?The charging handle problem has taken my SUCQB from something useful to problematic range toy status.
It won't cycle subsonic (WWB 147 grain) reliably, so a larger heavier charging handle would be counter productive..
I have to set the butt plate on the bench or ground, then making sure that I know where the muzzle is pointed, cycle the action with the web of my hand.
115 grain Blazer Brass cycles well, but with a bit of a sonic crack. I've gone the Mcarbo route on the inner workings and lubed everything well. I hope a couple hundred more rounds down the barrel will help it loosen it up to the point where it will cycle 147 grain subsonic.
CQB has only 5" of barrel where pressure/recoil impulse is generated. The Sub has 16" of barrel.I've been shooting factory ammunition, so cartridge length should be in spec.
The spring is installed properly.
I suspect that CQB has a stronger recoil spring.
I would not trust Win White box any farther than I could throw it in any caliber pistol or rifle IMO, the Speer .... that's a different story and I say this with 30 years of mil/leo experience. We have experienced everything from blown out primers, OAL too long / ftf, and ripped brass to squibb's and pounding a stuck bullet back out with a cleaning rod. I have several good to go guns both rifle and handgun that **** the bed on white box and eat everything else, some even Blazer alum. and Russian steel. Even if it does cycles it's been our experience that it's dirty ammo and that not good for suppressors.I tested my rifle using Winchester White Box 147 grain, and 147 grain Speer G2 duty loads. Neither would push the bolt back far enough to pick up the next round from from the magazine.
A selection of 115 grain and 124 grain ammunition worked without problems.
All 147 grain 9mm loads are subsonic.
Bullet velocity and bolt velocity are directly related. That's why a lot of competitive shooters use 147 grain bullets. They consider them 'soft' easy shooting loads.