Subsonics not cycling in a moderated semi auto shotgun

Stumpy2 · 2026-06-12T08:00:36+0100

Jamouk said:
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 · 2026-06-12T09:13:28+0100

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

Gmm243 · 2026-06-12T10:07:00+0100

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 · 2026-06-12T10:09:10+0100

Smellydog said:
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 · 2026-06-12T10:11:13+0100

Gmm243 said:
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 · 2026-06-12T11:35:51+0100

Stumpy2 said:
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 · 2026-06-12T12:36:17+0100

Smellydog said:
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!

Subsonics not cycling in a moderated semi auto shotgun

Stumpy2

Well-Known Member

Smellydog

Well-Known Member

Gmm243

Well-Known Member

Stumpy2

Well-Known Member

Stumpy2

Well-Known Member

Smellydog

Well-Known Member

Faust

Active Member

Similar threads