1. Does the diana 48-52-54 series of rifles have a choked barrel?

2. If the barrel is chopped to say 12 inches, does it HAVE to be
rechoked?

3. If a good quality barrel is NOT choked does accuracy suffer? Assuming
a good barrel crown?

4. If various pellet diameters are available, will the choke have
a different effect on each of the common diameters of .177
pellets?

Philip, I was going to replace my muzzle break with an after market.
I removed my muzzle break and to my surprise the barrel was not blued, but looked like raw steel
or maybe brass. The top of the barrel has a 30 to 45 degree bevel approximatley 1" from crown.
I should have taken pictures. I don't really think I should worry about it. The gun shoots dime size groups at 30 yards.
I'll put everything back like it was and live with it. Anyone seen this before??

1. NO

2. Yes

3. good quality barrel is choked and it does have a barrel crown

4. the choke will definitely help the brand of pellet brand in either .177 or .22 cal

5. what brand of an air rifle are you asking???

warren

and remember "it's 30% the gun and 70% the shooter"

1. Does the diana 48-52-54 series of rifles have a choked barrel?
I don't have direct experience with this series. Warren may be right - but this would then be the only unchoked modern Diana. You can test this by pushing a pellet through form the breech with a long rod. The gun would have to be fully disassembled to do this, of course.

2. If the barrel is chopped to say 12 inches, does it HAVE to be
rechoked?
No, of course not. No law regarding this.

3. If a good quality barrel is NOT choked does accuracy suffer? Assuming
a good barrel crown?
Lots of debate on this. Generally - you want the last stretch of the bore to be no greater in I.D. than the tightest previous point. A choke is a good way to ensure this. But a barrel that shoots well, shoots well, and that's that. I've got a Crosman G1 that I chopped and crowned, and it shoots perfectly well w/o a choke (dime @ 20 yd). Of course, it also violates your 'good barrel' criteria!

4. If various pellet diameters are available, will the choke have
a different effect on each of the common diameters of .177
pellets?
Seems reasonable that it would. A choke will slow a pellet, and will slow a larger, but otherwise identical, pellet more (friction). So you'll get different MVs. You'll may also see the effect of whatever elasticity is inherent to that alloy.

I think this is a good time to slug the barrel. Then do the research, and I'm sure it's been done by someone here or the yellow, on pellets and their respective diameters. Good luck and please post your findings.

as evidenced by the significant increase in effort it takes to push a cleaning pellet (from breach end) out the last little bit of barrel at the muzzle. This is an easy test to perform....