Subsonics not cycling in a moderated semi auto shotgun

[Stumpy2]

It's a beretta a303 with a hushpower mod and game bore evo Rs

According to gamebore the eco r are 24 or 28 gram. 12G Evo R | Gamebore

Your beretta is from an era when 32 gram was the standard load so would have been designed to shoot and function with 32g.

Give it a good clean and try a few different loads, heavy to light, until you find something suitable.

Good luck

 

[Smellydog]

I'm pretty sure the 303 can handle a range of loads.

 

[Gmm243]

My old Remington 1100 was very load fussy no matter what I did to it. It would only really cycle 36gm shells with any reliability. 32's nearly always worked but you just couldn't trust them fully.
My current 11-87 cycles 28gm all day long and I never have an issue with it though if you go down to 24gm it can not deal with them.

 

[Stumpy2]

I'm pretty sure the 303 can handle a range of loads.

Yes they’re usually pretty good, but we don’t know how much work this particular one has done or how it’s been maintained. A scrape out of the gas ports and a serious scrub and decarbonise might fix it?

 

[Stumpy2]

My old Remington 1100 was very load fussy no matter what I did to it. It would only really cycle 36gm shells with any reliability. 32's nearly always worked but you just couldn't trust them fully.
My current 11-87 cycles 28gm all day long and I never have an issue with it though if you go down to 24gm it can not deal with them.

The rem 1100 I had only cycled 32 gram, 36 gram jammed it and 28 gram were a no no! Though when it worked it shot well!

 

[Smellydog]

The rem 1100 I had only cycled 32 gram, 36 gram jammed it and 28 gram were a no no! Though when it worked it shot well!

I believe some would drill the port/s a fraction bigger to help and of cause it needed that o ring.

 

[Faust]

I have an old beat up Baikal hush power about a half mile long.
It's ugly but I shoot it really well. The length actually helps. And although not silent I have noticed that birds are soon to be coming in again. Any supersonic crack that is present seems to have little range, especially when windy.

Oh yes, I have had one of those since the mid 90's and the o/u 20 bore. Used with their cartridges they are very quiet. A bit like shooting with a bit of stove pipe but once onto a bolting rabbit it helps to continue the swing when taking the shot!

 

[Jamouk]

Yes they’re usually pretty good, but we don’t know how much work this particular one has done or how it’s been maintained. A scrape out of the gas ports and a serious scrub and decarbonise might fix it?

It's like brand new

 

[Gmm243]

The rem 1100 I had only cycled 32 gram, 36 gram jammed it and 28 gram were a no no! Though when it worked it shot well!

I loved mine, shot my first right and left at woodcock with it but it was terribly unreliable though it handled well and I shot well with it.
I used to put 36gm express (blue shells) though it and it worked fine then but anything less than that was a lottery and if you went to 28gm it was just not going to happen.
Tried so many options to get it to cycle reliably but it never worked out so changed for the 11-87 which never let's me down with 28gm or above regardless if I have forgotten to clean it or not.
Still have a hankering for a .410 1100!

 

[UpNorthMI]

I've always used Berretta semi auto shotguns, they have been super reliable, my first was a 302 which shot many thousands of shells for pigeon, today its a 391. The problem comes that once you moderate and try to shoot low power loads everything changes, you cannot expect a semi auto gun of any type to be reliable with so many significant changes.