barrel slugging question...

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peaceful_ruler

peaceful_ruler

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Dec 30, 2021
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PA, United States
I pushed a few .2165 slugs through my 700mm CZ barrel just to check for tight chokes or whatever else. What I discovered is that there is little to no choke whatsoever which should be good for shooting slugs. However, I also discovered that the bore was pretty tight on the breech end...the first 1/2"-1" was quite tight. I pushed slugs through from both directions. When pushing from the breech end it's really tight for the first inch and then the rest of the way it is very free. When pushing from the muzzle end it's a little tight for the first half inch or so and then moderately free all the way to the breech where it gets fairly tight again for that last inch. Is this how barrels are designed or is the tightness of the breech end going to disfigure the slug too much for the rifling to engage properly?

I also tried .217 lighter and shorter slugs and the tightness of the breech compared to the rest of the barrel was magnified. It felt like the slug had zero resistance after the first inch of tightness at the breech.
 
peaceful_ruler said:
I pushed a few .2165 slugs through my 700mm CZ barrel just to check for tight chokes or whatever else. What I discovered is that there is little to no choke whatsoever which should be good for shooting slugs. However, I also discovered that the bore was pretty tight on the breech end...the first 1/2"-1" was quite tight. I pushed slugs through from both directions. When pushing from the breech end it's really tight for the first inch and then the rest of the way it is very free. When pushing from the muzzle end it's a little tight for the first half inch or so and then moderately free all the way to the breech where it gets fairly tight again for that last inch. Is this how barrels are designed or is the tightness of the breech end going to disfigure the slug too much for the rifling to engage properly?

I also tried .217 lighter and shorter slugs and the tightness of the breech compared to the rest of the barrel was magnified. It felt like the slug had zero resistance after the first inch of tightness at the breech.
Click to expand...
Can the barrel be put in backwards? A tight breach and nothing the rest of the way kind of point to that being the problem.

Smitty
 
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Certainly not how you would wish your barrel to be, Barrel prep is everything and your s just may well be backwards, due to machining, tolerance press fit (dont think your brand does that)... .

Naturally THE test is, how does it group. Period. If it's all 10's at 100 be happy. If not you will need to address it one way or another.
John
 
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peaceful_ruler said:
I pushed a few .2165 slugs through my 700mm CZ barrel just to check for tight chokes or whatever else. What I discovered is that there is little to no choke whatsoever which should be good for shooting slugs. However, I also discovered that the bore was pretty tight on the breech end...the first 1/2"-1" was quite tight. I pushed slugs through from both directions. When pushing from the breech end it's really tight for the first inch and then the rest of the way it is very free. When pushing from the muzzle end it's a little tight for the first half inch or so and then moderately free all the way to the breech where it gets fairly tight again for that last inch. Is this how barrels are designed or is the tightness of the breech end going to disfigure the slug too much for the rifling to engage properly?

I also tried .217 lighter and shorter slugs and the tightness of the breech compared to the rest of the barrel was magnified. It felt like the slug had zero resistance after the first inch of tightness at the breech.
Click to expand...
You barrel dynamics sound a little odd, but, all that matters is, how does it shoot?
 
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Smitty911 said:
Can the barrel be put in backwards? A tight breach and nothing the rest of the way kind of point to that being the problem.

Smitty
Click to expand...
I don't think so as it has different depth of threads on the ends and spacing. I'm not 100% sure the threads are the same either. Might be something to look into though! Sometimes you gotta think out of the box
 
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