breeze Posted February 4, 2014 Report Share Posted February 4, 2014 I recon that my .223 without a mod is one hell of a lot louder than my friends .222 without out a mod. Is this the case? Has anyone ever done a decibel test with these calibre's? Quote Link to comment Share on other sites More sharing options...
colin lad Posted February 4, 2014 Report Share Posted February 4, 2014 never compared them but there is only a few grains more in each, though my .222 sounds louder with some rounds than others i reloaded some rounds with 50g vmax and some with some 50g dogtown soft nose and the latter seemed quieter than the vmax even though they both had 22.2grains of powder each colin Quote Link to comment Share on other sites More sharing options...
fortune Posted February 4, 2014 Report Share Posted February 4, 2014 Things like this are subject to many different circumstances. Basically it’s the same, 224-dia bullet being pushed by a similar amount of powder and travelling at similar speed. The different things can affect this noise are the barrel length; twist rate, construction of barrel, style and type of the bullet, burn rate of the powder, bedding of the barrel and the temperature and density of the air Quote Link to comment Share on other sites More sharing options...
kent Posted February 5, 2014 Report Share Posted February 5, 2014 there can be a slight difference (due to amount of powder) but much depends on so many other factors Quote Link to comment Share on other sites More sharing options...
Amazed Posted February 5, 2014 Report Share Posted February 5, 2014 Lenght of the barrel can play a big part. My triple only has a 16 inch barrel and is loud as hell even with a mod on. Quote Link to comment Share on other sites More sharing options...
kent Posted February 5, 2014 Report Share Posted February 5, 2014 On the subject of length, the moderator can only cool the gasses after they are burned to a gas. If they are still burning in the moddy or after leaving it, then it cannot function on them. A change of powder can transform a gun both on noise and also velocity, even reducing such an overcharge charge can have positive effect on consistency, noise, muzzle flash and it might not even have much effect on speed as velocity is only gained from that burnt within the barrel length. Sometimes looking outside the normal remit of powder choice per calibre might help, provided you check it out first on quickload or the likes as dangerous early pressure peaks might present an issue if you just try a wild punt Quote Link to comment Share on other sites More sharing options...
Dekers Posted February 5, 2014 Report Share Posted February 5, 2014 Like for like the .223 will be louder than a .222, as for ......one hell of a lot louder...... ? Quote Link to comment Share on other sites More sharing options...
Bewsher500 Posted February 5, 2014 Report Share Posted February 5, 2014 bullet meplat can affect perceived noise more powder = more noise in general, but as said powder burn rate and barrel length combined with all sorts of other variables will affect it my .222 with a decent mod, 19" barrel and firing 60gr bullets over 20 odd grains on N133 is quieter than my HMR with the same mod! Quote Link to comment Share on other sites More sharing options...
rem708 Posted February 5, 2014 Report Share Posted February 5, 2014 As everyone has said there is a multitude of variables at play here. Provided you are using the same bullet, powder and powder weight then you have some chance of a rough comparison. Generally all powder is burnt by the time the bullet is about 10inches down the barrel. The longer the barrel the lower the gas pressure when the bullet bursts into free air. Really does this matter? the quarry you are aiming at will not hear the muzzle noise (provided its a lethal hit). Peripheral quarry may well scarper at any noise! In your case I would not be surprised if the triple 2 has a crowned barrel and the 223 not and of course I'm assuming you are not standing in front of the muzzle in both cases Quote Link to comment Share on other sites More sharing options...
kent Posted February 5, 2014 Report Share Posted February 5, 2014 As everyone has said there is a multitude of variables at play here. Provided you are using the same bullet, powder and powder weight then you have some chance of a rough comparison. Generally all powder is burnt by the time the bullet is about 10inches down the barrel. The longer the barrel the lower the gas pressure when the bullet bursts into free air. Really does this matter? the quarry you are aiming at will not hear the muzzle noise (provided its a lethal hit). Peripheral quarry may well scarper at any noise! In your case I would not be surprised if the triple 2 has a crowned barrel and the 223 not and of course I'm assuming you are not standing in front of the muzzle in both cases The statement that ALL the powder is burnt depends on the powder and other factors - at ten inches I doubt it personally and you can see the resulting flame in longer barrelled pistols used with rifle cartridges for this very reason. something that has fully burnt cannot produce flame. All barrels are Crowned do you mean deeply recessed crown? how does that work then in conjunction with a moderator Quote Link to comment Share on other sites More sharing options...
breeze Posted February 5, 2014 Author Report Share Posted February 5, 2014 (edited) Rem708 the reason I noticed the noise difference was when I was shooting the.223 without a mod and couldn't help but notice a penetrating boom into my ear drum! We do not get it with his .222 no where near as loud and generally shoot it without ear defenders (stupidly). I don't fancy the .223 without ear defenders too much! I think your right it doesn't matter much about the quarry it's either dead or running like hell!!!!! It was more my ear drums that made me wonder! Edited February 5, 2014 by breeze Quote Link to comment Share on other sites More sharing options...
Salizar Posted February 5, 2014 Report Share Posted February 5, 2014 Traded my S/H .222 with a no name reflex mod on it and now have a new CZ 527 .222 with varmint barrel, which I had chopped to 20" and proofed/screwcut. I have a Sonic 45 reflex mod on it. Weather permitting I`ll get to the range next week to break the barrel in with some PP S/P and see how effective the mod is. will report back. JB Quote Link to comment Share on other sites More sharing options...
Bewsher500 Posted February 6, 2014 Report Share Posted February 6, 2014 1)Generally all powder is burnt by the time the bullet is about 10inches down the barrel. 2)The longer the barrel the lower the gas pressure when the bullet bursts into free air. 3)Really does this matter? the quarry you are aiming at will not hear the muzzle noise (provided its a lethal hit). Peripheral quarry may well scarper at any noise! 4)In your case I would not be surprised if the triple 2 has a crowned barrel and the 223 not and of course I'm assuming you are not standing in front of the muzzle in both cases 1) with a rimfire maybe but no chance with a CF, slower burning powders combined with much higher charge levels can see muzzle flash on any CF if you cut the barrel short and don;t step up the burn rate 2) total opposite, the resultant gas from a CF charge burning is still expanding. Its the reason longer barrels using the same charge will see higher MV's, that only comes from higher and increasing gas pressures (think of the friction and resistance if the pressure stopped increasing longer barrels would slow bullets down) 3) matters to me when half my foxing is done 10-30yds from someone's front room! 4) whats an "uncrowned barrel"? Quote Link to comment Share on other sites More sharing options...
Catweazle Posted February 6, 2014 Report Share Posted February 6, 2014 Does a deep crown make a difference to perceived noise ? I'm curious, because my .308 is so noisy with some loads that other .308 and .303 shooters have commented on it. The loads are well within limits, no pressure signs at all. It does have a short, thin profile barrel, if that makes a significant difference. If I could make it a bit more range-friendly by re-cutting a crown I would. Quote Link to comment Share on other sites More sharing options...
kent Posted February 6, 2014 Report Share Posted February 6, 2014 Does a deep crown make a difference to perceived noise ? I'm curious, because my .308 is so noisy with some loads that other .308 and .303 shooters have commented on it. The loads are well within limits, no pressure signs at all. It does have a short, thin profile barrel, if that makes a significant difference. If I could make it a bit more range-friendly by re-cutting a crown I would. If what you say is true its most likely the short barrel that's the issue, I assume its not got a muzzle break on it? It normally wont draw comments if you gun is a bit noisy on the range as all are wearing protection and this bit makes me think - muzzle breaks will genrally draw comment though Quote Link to comment Share on other sites More sharing options...
Dekers Posted February 6, 2014 Report Share Posted February 6, 2014 Does a deep crown make a difference to perceived noise ? I'm curious, because my .308 is so noisy with some loads that other .308 and .303 shooters have commented on it. The loads are well within limits, no pressure signs at all. It does have a short, thin profile barrel, if that makes a significant difference. If I could make it a bit more range-friendly by re-cutting a crown I would. I suspect this is down to a short barrel and still burning powder exiting the barrel, I can't see the crown having much to do with this! Maybe a moderator!? Quote Link to comment Share on other sites More sharing options...
Bewsher500 Posted February 9, 2014 Report Share Posted February 9, 2014 actually loads that produce muzzle flame tend to be quieter, no idea why I have a .270 that was producing some awesome flames when I tried the same charge on 135gr SMK;s that I use on 130gr interlocks Quote Link to comment Share on other sites More sharing options...
Catweazle Posted February 9, 2014 Report Share Posted February 9, 2014 I suspect this is down to a short barrel and still burning powder exiting the barrel, I can't see the crown having much to do with this! Maybe a moderator!? I suspect you are correct, the short barrel is the culprit. Most range users have quite long, heavy barrels and probably aren't using full powered loads either. I was using 150grn PPU heads and 45grn N140 powder. Quote Link to comment Share on other sites More sharing options...
colin lad Posted February 9, 2014 Report Share Posted February 9, 2014 i took a chap out off here with his 14" barrel hmr there was 3 of us in the car one had a 21" barrel hmr and i took my .222 the 14" hmr was by a long way the loudest of all 3 colin Quote Link to comment Share on other sites More sharing options...
Underdog Posted February 9, 2014 Report Share Posted February 9, 2014 Don't forget the standard factory pressure limit for 222 is lower than it is for 223! U. Quote Link to comment Share on other sites More sharing options...
Amazed Posted February 10, 2014 Report Share Posted February 10, 2014 Don't forget the standard factory pressure limit for 222 is lower than it is for 223! U. Am I correct in that the faster burning powders can achieve a louder report ? I'm sure I read it somewhere but carnt really recall. Quote Link to comment Share on other sites More sharing options...
Underdog Posted February 10, 2014 Report Share Posted February 10, 2014 Am I correct in that the faster burning powders can achieve a louder report ? I'm sure I read it somewhere but carnt really recall. There is no rules on it really Quote Link to comment Share on other sites More sharing options...
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