Yes I got bored again and stared thinking. So here is what I came up with. With Jon's extension for his gun. The muzzle mics out at .710, modified choke. So to improve the ballistics and pattern of the gun, what if we come in from the other end of the barrel, drop down to where the barrel starts to tapper in and cut wad stripping steps in the barrel ? So basically what you would end up with is an extension with a modified choke and wad stoppers in the barrel. Going off of the principle of a Wad Wizard choke or a Pattern Master but done inside of the barrell .
Here is how it would go. At the receiver end of the barrel, it mics at .760 ID. Then measure down to where the barrel starts to choke. At that point I would cut three steps .750, .740, and .730. The end muzzle mics out at .710. This would slow down the wad inside of the barrel , giving more time for the wad to separate from the shot. Giving a better pattern without having the ability to use a screw in choke.
Could there be abrupt pressure changes as the wad traveled down the barrel with the steps? Most of the time I here of folks back boring and lengthening the forcing cone for a smother transition and less felt recoil.
What is the advantage of the wad separating early? I would think we are talking about inches difference at best unless the wad separation occurs inside the barrel. At that point wouldn't the advantage gained then be lost to pellets rubbing the barrel?
Honestly, I haven't thought any of this out. Just thinking about it as I type.
If you reload, and I would assume you do with all this trouble, I have noticed a big difference in patterns based on which wad is used.
Btw... What improvements in ballistic and pattern are you looking for?
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"If money can fix it, it ain't broke" The great theologian and my crow hunting partner AW.
My uncles shoots in these high dollar turkey shoots. The principle is taken off of one of their chokes. The idea is to get more performance out of a barrel that is not able to have an after market choke installed in it. The steps would get installed about 3 inches in front of the muzzle of the barrel. So the wad would stay with the shot up to the last 3 inches of the barrel. The custom chokes that my uncles use are installed on IC barrels. The pattern they shoot are a little insane. I was just figuring that I could improve the performance of jon's extension .
I have a Wad Wizard choke and like it. But basically its a IC chokes that separates the wad from the shot before leaving the choke. Well, with Jon's extension has a modified choke, if I can incorporate wad stripping to it, how much more with it help. With the Wad Wizard choke , the larger the shot. The more range you get out of it but shooting #7's, well, is a real good shooting IC. Now if you go up in the shot size, you get tighter patterns at longer ranges. With BB's and #2's birds don't stand a chance. I just don't see the need for those shells on crows. Well maybe sometimes but not for most.
As far as pressure drops, the shot and wad have to travel through a 47 inches of barrel and pass 39 holes before getting to the steps and choke.
I don't reload, only for my rifles.
Improvements - ? 50 inch barrel, 39 ports, .710 choke, wad stoppers, who knows. Anything to help Jon hit a crow.
I said I got bored again.
This is one of those to where, I could work on other thing. But working on this is way more fun.
You are shooting a metro barrel with subsonic rounds? Speed should be 900-1000 fps? My experience with those loads through a standard length barrel is they pattern very tight. Too tight for my taste as a matter of fact. Are you trying to tighten the pattern?
Not having shot more that a couple of boxes of these (and most of those were at a pattern board) the range of them are limited due to lack of velocity. I base this strictly on my memory of the fall on the pattern board and not on empirical data.
So, if I am correct (not sure about that at all) and the patterns are very tight and the range is limited, what is the advantage of tightening the pattern? If you are doing this just to see if it will work, I am all about that! That is my kind of project! Guess I am still trying to figure out why you are doing this. Is the gun shooting too open of a pattern?
Again these are just ramblings and not well thought out on my part.
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"If money can fix it, it ain't broke" The great theologian and my crow hunting partner AW.
Total Reason - Just because I a'nit got crap else to work on and how cool will it be to have a modified extension with a wad stripper built in to it.
Once I get the Chucking Reamers in. We are going to pattern the gun with sub-loads and standard load. Thirty inch circle at 40 yards. Once we see how the gun patterns we will cut the steps into the barrel and re-pattern the gun to see if we have made a change. If we do improve the pattern, great. If we don't , well dang. Just think of the fun we will have trying.
