Chambering effects on moderator internals.

[gixer1]

is moderator baffle damage mainly a result of velocity, charge weight difference or clearance?

The reason I ask is I have 2 moderators with the same muzzle thread type, both are .30 cal mods.

One rifle is a .223 that will be running around 2750fps, the other rifle is a 6.5 running around 2650fps.

One moderator has a stainless insert, the other does not.

Do I run the stainless insert on both rifles for range use or would I be ok running the mod without the stainless insert on the 223 as it has more clearance.

Both rifles will be used for targets on range so could have larger shot strings.

I haven’t got an option to get another stainless baffle easily.

Regards,
Gixer

 

[Utectok]

My understanding is that’s is heat and pressure that damage moderator baffles and that diameter of clearance has the greatest effect on reducing noise. I believe about 1mm over projectile diameter is best to keep noise to a minimum. Personally I always try to run calibre specific moderators for this reason.
I think and reductions in pressure and heat from running a larger diameter for calibre will be minimal.

 

[Foxyboy43]

is moderator baffle damage mainly a result of velocity, charge weight difference or clearance?

The reason I ask is I have 2 moderators with the same muzzle thread type, both are .30 cal mods.

One rifle is a .223 that will be running around 2750fps, the other rifle is a 6.5 running around 2650fps.

One moderator has a stainless insert, the other does not.

Do I run the stainless insert on both rifles for range use or would I be ok running the mod without the stainless insert on the 223 as it has more clearance.

Both rifles will be used for targets on range so could have larger shot strings.

I haven’t got an option to get another stainless baffle easily.

Regards,
Gixer

Hmmm.
For range use i.e. high volumes of shots with subsequent continual high temperatures I was always very careful which mod I used. I always feared that lightweight (generally ) aluminium mods may not respond well to range work - especially if the innards are not steel or some more durable metal like titanium. Practical experience has lead me to go for all steel construction - my excellent Utra SL5 has had thousands of rounds through it from 6.5 through to .308 without any problems whatsoever… err…. except that rather unfortunate time when I used it on a busy day and forgot to remove the elasticated cammo tape. Do you know how hard melted cammo tape sets boys and girls? Foxyboy does…..
Be interesting to hear how others have got on with lightweight mods used on range days.

 

[MarinePMI]

My understanding is that’s is heat and pressure that damage moderator baffles and that diameter of clearance has the greatest effect on reducing noise. I believe about 1mm over projectile diameter is best to keep noise to a minimum. Personally I always try to run calibre specific moderators for this reason.
I think and reductions in pressure and heat from running a larger diameter for calibre will be minimal.

Hole diameter is but one aspect of sound dampening. Baffle stack density is another. This is why suppressors designed for subsonic ammo have standard/similar sized baffles Usually with a single expansion chamber in front of the baffle stack). But for supersonic ammunition, it has been found that baffles, differing in length, increase sound dampening, as they slow down the escaping gases by essentially creating ever smaller expansion chambers within the mod itself.

This is why you see most modern suppressors for supersonic ammunition, having the baffles numbered for correct reassembly.

 

[MarinePMI]

is moderator baffle damage mainly a result of velocity, charge weight difference or clearance?

The reason I ask is I have 2 moderators with the same muzzle thread type, both are .30 cal mods.

One rifle is a .223 that will be running around 2750fps, the other rifle is a 6.5 running around 2650fps.

One moderator has a stainless insert, the other does not.

Do I run the stainless insert on both rifles for range use or would I be ok running the mod without the stainless insert on the 223 as it has more clearance.

Both rifles will be used for targets on range so could have larger shot strings.

I haven’t got an option to get another stainless baffle easily.

Regards,
Gixer

It's largely due to heat and pressure, as well as the material of the baffles themselves. Inconel or titanium are what many high end suppressors use, for this reason.

 

[gixer1]

It's largely due to heat and pressure, as well as the material of the baffles themselves. Inconel or titanium are what many high end suppressors use, for this reason.

Sorry, a lapse on my part - the titanium baffle is in one of the mods…the other is a lightweight mod.

Regards,
Gixer