Honkeymcgee Posted August 15, 2016 Share Posted August 15, 2016 I am thinking about adding some popple holes to my Czechmate but have a couple questions about it. 1. How many should I go with? 2. How big of a hole? 3. How far back should I start them? (Drill through the comp body or start before the threads on the barrel start) 4. How much space between the holes? This is for a 9mm shooting uspsa major. Thanks in advance for the help. Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 16, 2016 Share Posted August 16, 2016 I'll answer your questions with a question: what are you loading right now? Link to comment Share on other sites More sharing options...
Honkeymcgee Posted August 16, 2016 Author Share Posted August 16, 2016 Just changed to precision Delta 124s and the charge I was using with my previous bullet of 7.2gr autocomp loaded out to 1.160 was putting me right around 175 PF. Federal magnum match primers Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 16, 2016 Share Posted August 16, 2016 OK so you could get away with 3-4 holes and still make Major, I feel like if you drill do many holes you have to go to heavier bullets or faster powder, you're going in the wrong direction. Have you ever tried 3N38 under 115s? Either way, three 5/32" holes, 3/16" on center, tipped 10 degrees back towards the shooter starting at the intersection of slide and comp work pretty well. If you're using an upright C-More without a blast shield you might skip the tipped back part Link to comment Share on other sites More sharing options...
Honkeymcgee Posted August 16, 2016 Author Share Posted August 16, 2016 Thanks. Almost exactly how I was planning on doing it. The CZ comp has a lot of meat behind the muzzle of the barrel so I will have 2 on the comp and one right behind the intersection. Going to go with straight because I don't have a blast shield. 3/16 on center, is that the spacing you are referring to between holes? Link to comment Share on other sites More sharing options...
js1130146 Posted August 17, 2016 Share Posted August 17, 2016 Have you drilled/Are you going to drill these yourself? I am in the process of rebuilding an open top end in 9 major and am thinking about trying some holes. Link to comment Share on other sites More sharing options...
Honkeymcgee Posted August 17, 2016 Author Share Posted August 17, 2016 Myself and a friend who is a machinist will be doing it. So basically I will say put the hole there and he will do it lol. If I had a mini mill I would do it myself. Plan on acquiring one in the future. Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 17, 2016 Share Posted August 17, 2016 Yes, 3/16" between the centers of the holes. Link to comment Share on other sites More sharing options...
js1130146 Posted August 17, 2016 Share Posted August 17, 2016 How wide of a slide slot do you have there atlas? Link to comment Share on other sites More sharing options...
Honkeymcgee Posted August 17, 2016 Author Share Posted August 17, 2016 2 hours ago, kneelingatlas said: Yes, 3/16" between the centers of the holes. Guess that picture is deceiving. Looks like a lot more space Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 17, 2016 Share Posted August 17, 2016 This is what 5/32" holes on 1/4" centers look like: Link to comment Share on other sites More sharing options...
zzt Posted August 18, 2016 Share Posted August 18, 2016 (edited) ka, do more poppels equal flatter shooting? Edited August 18, 2016 by zzt Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 18, 2016 Share Posted August 18, 2016 (edited) 2 hours ago, zzt said: ka, do more poppels equal flatter shooting? Within limits I'd say that's a reasonable assumption; the feel of an Open gun is a very personal thing and there are always trade offs: flatness, loudness, slap in the hand, etc. One comp design may perform best with a different volume/pressure of gas at the muzzle, and number/size/location of holes in the barrel effect that; in my experience, most comps benefit from at least two holes. Edited August 18, 2016 by kneelingatlas Link to comment Share on other sites More sharing options...
Honkeymcgee Posted August 20, 2016 Author Share Posted August 20, 2016 On Tuesday, August 16, 2016 at 7:34 AM, kneelingatlas said: OK so you could get away with 3-4 holes and still make Major, I feel like if you drill do many holes you have to go to heavier bullets or faster powder, you're going in the wrong direction. Have you ever tried 3N38 under 115s? Either way, three 5/32" holes, 3/16" on center, tipped 10 degrees back towards the shooter starting at the intersection of slide and comp work pretty well. If you're using an upright C-More without a blast shield you might skip the tipped back part What pistol is this in the pic? If it's a CZ could you post a few more pics like what it lol like with an open slide. Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 20, 2016 Share Posted August 20, 2016 Link to comment Share on other sites More sharing options...
js1130146 Posted August 26, 2016 Share Posted August 26, 2016 On 8/16/2016 at 7:34 AM, kneelingatlas said: OK so you could get away with 3-4 holes and still make Major, I feel like if you drill do many holes you have to go to heavier bullets or faster powder, you're going in the wrong direction. Have you ever tried 3N38 under 115s? Either way, three 5/32" holes, 3/16" on center, tipped 10 degrees back towards the shooter starting at the intersection of slide and comp work pretty well. If you're using an upright C-More without a blast shield you might skip the tipped back part What type of bit did you use for the barrel and slide holes? Are popple holes doable with a drill press or is a mill mandatory? Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 26, 2016 Share Posted August 26, 2016 Just a regular carbide bit will go through the barrel and slide no problem, they're not very hard, the trick is getting them lined up perfectly. With patience you could do it with a drill press. Link to comment Share on other sites More sharing options...
tyler2you Posted August 26, 2016 Share Posted August 26, 2016 A ball end mill does a very clean job after punching through the inside of the barrel and the rigidity keeps it from "walking" like a drill bit can. Sent from my SM-G930V using Tapatalk Link to comment Share on other sites More sharing options...
js1130146 Posted August 26, 2016 Share Posted August 26, 2016 I'm tempted to give it a go myself, but still on the fence. Thanks for the info guys Link to comment Share on other sites More sharing options...
js1130146 Posted August 27, 2016 Share Posted August 27, 2016 1 more question. Would I need to put something inside the barrel to drill into? Or is that not an issue? Link to comment Share on other sites More sharing options...
kneelingatlas Posted August 27, 2016 Share Posted August 27, 2016 7 hours ago, js1130146 said: 1 more question. Would I need to put something inside the barrel to drill into? Or is that not an issue? I've never found it to be an issue, I look down the barrel while punching through so I stop short of the other side. Link to comment Share on other sites More sharing options...
Honkeymcgee Posted September 6, 2016 Author Share Posted September 6, 2016 On Friday, August 26, 2016 at 5:29 PM, js1130146 said: I'm tempted to give it a go myself, but still on the fence. Thanks for the info guys Hey bud, check out my Czechmate review I did in the open pistol section. I just updated with some pics of the holes I did my self. Schedules weren't lining up with my friend so I just busted out the dremel and drill press and knocked it out. Link to comment Share on other sites More sharing options...
theWacoKid Posted October 24, 2016 Share Posted October 24, 2016 (edited) On August 16, 2016 at 10:42 PM, kneelingatlas said: Yes, 3/16" between the centers of the holes. Double check that. 3/16" on centers with 5/32" holes leaves 1/32" between hole edges. That's not what that picture shows and if you chamfered holes that close even the chamfers would touch. I think you have 3/16" between hole edges, which is what I'd suggest since you can still punch the holes to 3/16" and then have 5/32" between hole edges. Edited October 24, 2016 by theWacoKid Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 24, 2016 Share Posted October 24, 2016 I think you're right Ben, that was probably 3/8", not 3/16" Link to comment Share on other sites More sharing options...
Honkeymcgee Posted October 24, 2016 Author Share Posted October 24, 2016 10 minutes ago, kneelingatlas said: I think you're right Ben, that was probably 3/8", not 3/16" Doh! Mine came out pretty close to each other... lol Link to comment Share on other sites More sharing options...
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