msg73

I have a nitrofin on my limited gun and like it. However, I had from when I built the gun. So, I cut the barrel lugs with the nitrofin. You should mic your current slide stop to make sure it’s within normal specs. 0.200” I believe. If yours is out of spec, the nitrofin won’t fit right or require fitting.

I’ve been on the fence on adding popple holes for a while now. Can you guys provide some additional details on your personal experiences (e.g. how much reduced dot movement, does it hit harder now, any change in splits, how much more powder needed for same pf, etc)? I’m currently using 8.7gr hs6 with PD 115 jhp at 1.165 to get 170pf, so my barrel seems fast enough to take the holes without having to overfill the case with powder.

It’s a wave spring. They’re sprung around 25lbs and like you said, it’s for extra ‘buffering’. Some put quarters in between it and the buffer spring.

Nice Eric. My 15-22 has been collecting dust in the safe for quite some time. I guess I know what my next project will be ?

There are two main recoil impulses: 1) when your bolt/buffer goes back and bottoms out at end of the buffer tube or quarters/spacer and 2) when your bolt slams forward at the end of the firing cycle. I agree that the rearward recoil impulse would be lessened with a longer stroke but that extra length would also enable the bolt to travel faster in the forward stroke. This is where the feel is very subjective relative to the shooter. I, like many here, have tried different setups and I prefer a shorter stroke with a lighter 223 spring. Like Eric, I use hits on paper and a timer to be the judge as subjective feelings could fool you into thinking a particular setup is better because it feels better but in reality, it may be slower and less accurate.

With a JP bolt and a blitz buffer running 133pf 124gr and 147gr loads out of a 16” barrel, mine had the least movement with a 223 carbine spring and about $1.50-$2 in quarters (forget exactly how many quarters). Definitely had more movement with the dot when I tried a 308 carbine spring. The quarters also made a noticeable impact as I had more bounce with the 223 carbine spring and no quarters vs 223 with quarters. My experiment with wave spring next.

An efficient setup will have much of the gas coming out of the top/side ports of the comp to keep the gun as stable as possible. If there’s excess gas coming out of the front of the comp, that’s counterproductive as it’s forcing the gun back/up. That said, HS6 is used my many (myself included) and the above, while theoretically true, may not have a noticeable impact. It may be more effective if you work on your grip and learn the timing of your gun. You may also be driving the gun down a bit in anticipating recoil. You shouldn’t need to go to a 7lb spring to avoid the dip.

If you can put together furniture from IKEA, you should be able to build one just the way you like it for much less than the GMR. Nothing wrong with the GMR (besides being on the heavy side), but no reason you can’t build something comparable. Bunch of info on setups that have worked well.

Holosun 510c. Clear and crisp reticles, awesome battery life, durable, larger window than cmore and great price point.

Only difference is the straight trigger with shoe vs curved

Find a main/hammer spring that will set off your primers reliably, then play around with different recoil springs. Go out and shoot two quick shots in a clean target and see where your second shot lands relative to the first. If the 2nd shot is low, that usually means the recoil spring is too strong (or you're jerking the trigger). Keep trying until you see a consistent pattern

Spartan V: 17lb main and 9lb recoil CZ SP01: 11.5 main, 10lb recoil CZ Shadow 2: 11.5 main, 10lb recoil I've used 147gr Acme and 124gr Acme/Extreme plated/MG CMJ.

found the answer...

Maybe it's time to crank up the Bridgeport Eric . I really like my 45* mount but I suppose it couldn't hurt to have the c-more further back like some other 90* setback mounts.

round counts are off on some of the stages...

Yes, that's what shot calling is. Try to resist the urge to fire two shots on a single sight picture (if that's your case) and have the visual patience to see (and know) an acceptable sight picture for the distance and target you're shooting.

I agree, it looks like you ran the gun dry. It happened after the 18th shot (assume you started with 17+1). That cost you a lot of time. It's more a result of less than optimal stage planning and too many extra shots. If you've only been shooting a year or two, then you might be in that stage of shooting where you're a decent shot but focused more on blazing speed at the expense of accuracy (hence the extra shots). That might be fine for Open but shooting that way in Production will be costly. This may not be as applicable to the Zev match, but more a general comment for USPSA. Where I am, the Production division is deep and you can easily see the better shooters have a much more deliberate stage plan and making sure they get their hits. It might look slower than the blazing C/B shooter, but the hit factors tell the tale in the end.

Any info on the stages?

Keep that load if you like it and definitely try a different chrono just to be sure. I get 147pf using 6.2gr of Autocomp with a Precision Delta 115gr JHP @ 1.170".

There may be slight differences between batches, but my experience with TG and N320 is that N320 is slightly slower....maybe a tenth or two grains.

I use 4.0gr of N320 with a 200gr Acme RN @ 1.180". This gets me 171pf on a sunny 55* day out of my 5" Schuemann barreled 2011 limited gun.

Looks nice. What grit silicone carbide did you use?

Make sure you have enough tension on the left leaf of the sear spring. If it's too light, it doesn't put enough pressure on the sear to catch the hammer hooks reliably. Also, why doesn't your hammer have the half cock hooks? Or are you saying that it doesn't catch on the half cock hooks either?

Your barrel feed ramp looks a little steep compared to mine. But before you do anything to the barrel ramp, take a another look at your mags. I use Tripp Cobra mags and my rounds point much higher than yours. The tip of the bullet is higher than the top of the ramp. So, even if your ramp is a little steep, it should still chamber as the bullet would just deflect up off the top of the ramp. In your first pic, it looks like your round is parallel (or even pointing a little down) to the frame and pointing directly into the ramp. Your bullets should be angled higher. What are your feed lip dimensions? Do all your mags do this?

6.2gr of WAC using a PD 115gr JHP @ 1.170" gets me 145pf.