Moderators shotguns and amunition performance.

[TONY R]

Now if you think about a typical fully moderated shotgun, only one i have encountered is the laporte swing trap, the barrel itsellf is drilled and the moderator surounds the barrel, now is it the down barrel drillings that simply slow down the load by scrubing off pressure, and the little part of the moderator that extends beyond the barrel that dampens the muzzle blast or is it the porting too.?

Would a muzle mounted mod with the chamber exit say 4 inch from the muzle but the chamber extending back down the outside of the barrel thus increasing chamber volume silence well moderat a subsonic load just as well as the porting.?

Do the ported hush powers etc loose speed compared to a normal gun, i imagine they do, but i do not know.

The metro gun idea is suposed to work i have never seen one other than on the metro gun site, anyone tried one.?

I read a thread on Crow busters or predator masters a guy used an 870 with a ABS external barrel tube fitted he claimed 9it worked, I will try and find the post and put a link here.

 

Still on the metro gun idea, What are your thoughts if any on this type of moderator GOOD or BAD>?

 

Have you any ideas thought or obserevations regarding and potential new ideas on shotgun moderation if so what?

for those that dont know a little more info on the metro gun.

 

http://www.register-herald.com/sports/sports_columns/the-quiet-man-l-p-brezny-and-the-metro-gun/article_5e0e0d4f-3f16-5e81-9aab-7606b3e0b7b0.html

Edited May 15, 2016 by TONY R

[Stonepark]

Most cartridges powder have burned up by 18 inches, as long as the porting for a silencer is after this, should have little effect on velocity.

 

As far as I can tell my hushpower is little different in velocity from my ou. Supersonic ammo, cracks out of both (suggesting no decrease in velocity) but the bang is silenced in the hushpower.

[TONY R]

Do you think its the expansion area volume that makes the difference or the gases venting out sooner through the ports?

Would a longer can or metro barrel do as good a job without porting?

Of the two later options i think i prefer the metro gun to the clamp on muzzle can but never handled either so these thoughts could be unfounded.

[figgy]

You only need to bleed off the air into a chamber and release it slowly to silence it. So abs pipe over a drilled barrel would work as pressure on a big enough tube that was vented shouldn't be a problem.

 

Basically a barrel shroud vented towards the breach should give enough expansion to work very well.

[Guest cookoff013]

Now if you think about a typical fully moderated shotgun, only one i have encountered is the laporte swing trap, the barrel itsellf is drilled and the moderator surounds the barrel, now is it the down barrel drillings that simply slow down the load by scrubing off pressure, and the little part of the moderator that extends beyond the barrel that dampens the muzzle blast or is it the porting too.?

Would a muzle mounted mod with the chamber exit say 4 inch from the muzle but the chamber extending back down the outside of the barrel thus increasing chamber volume silence well moderat a subsonic load just as well as the porting.?

Do the ported hush powers etc loose speed compared to a normal gun, i imagine they do, but i do not know.

The metro gun idea is suposed to work i have never seen one other than on the metro gun site, anyone tried one.?

I read a thread on Crow busters or predator masters a guy used an 870 with a ABS external barrel tube fitted he claimed 9it worked, I will try and find the post and put a link here.

 

Still on the metro gun idea, What are your thoughts if any on this type of moderator GOOD or BAD>?

 

Have you any ideas thought or obserevations regarding and potential new ideas on shotgun moderation if so what?

for those that dont know a little more info on the metro gun.

 

http://www.register-herald.com/sports/sports_columns/the-quiet-man-l-p-brezny-and-the-metro-gun/article_5e0e0d4f-3f16-5e81-9aab-7606b3e0b7b0.html

 

it was my understanding that the speed of the gas bleeding off is the reason silencers work. the chamber of guns (ie 12ga) are a fixed dimensions, after that the forcing cone and barrel diameter are all open to interpretation.

the hushpower system is a large volume section that the gasses bleed off into, they should increase with minimal pressure. the bangs related to shells are either the lead breaking the sound barrier and the gas escaping breaking the sound barrier.

i dont understand the red...

the muzzle only silencers would be more beneficial with minimal gas volume. shotguns by nature are large gas volume firearms.

 

my experience with subsonics (thats quiet subsonics) need minimal extremely fast burning powders to create the minimal gas volume cleanly, with this minimal gas the moderators are less saturated with escaping gas. or should i say optimal for that gas volume or below.

subs should run differently in different guns. but thats due to different barrel sizes.

 

my 1oz subs are great, so are the 21g subsonics done by graham / roughshooter.....

 

i started doing 42gram 3" subsonics with minimal powder loads, i have un attained if they are quiet in a moderated shotgun, but they were about 20 grains of powder, so may saturate the barrel and moderator (fibre wadded.)