Jim xyz Posted December 13, 2018 Report Share Posted December 13, 2018 Hi All, Just wondered on peoples thoughts; if you fire a 21/2 inch cartridge from a gun with a 3 inch chamber will the performance be affected or does it all happen too quickly at that stage? I have a mixture of guns with chambers from 21/2 to 3 inches so just tend to stick to 21/2 inch 30g's for safety. Would there be any noticeable benefit from using cartridges that match the chambers? Many thanks, Jim Quote Link to comment Share on other sites More sharing options...
Diss4111 Posted December 13, 2018 Report Share Posted December 13, 2018 No measurable difference. i would think theoretically there may be a very slight difference but if anyone could ever show it I doubt. Quote Link to comment Share on other sites More sharing options...
The Burpster Posted December 13, 2018 Report Share Posted December 13, 2018 It kinda disappears into irrelevance, as whatever the cartridge length the skirt of the wad has to expand to the size of the chamber before being funnelled into the forcing cone which sizes the whole load (pellets and wad) to the size of the bore. So think about the wad sat in the case and then the burn of the powder starts the push. It then pushes the crimp open and starts its journey, at the end of the case the skirt of the wad expands passed the diameter of the now open case and up to the chamber wall. Then it reduces as it travels along the forcing cone until it is the Size of the bore and then a perfect seal until it meets the choke. Quote Link to comment Share on other sites More sharing options...
Smokersmith Posted December 13, 2018 Report Share Posted December 13, 2018 The above counts for plastic wads. Fibre wads don’t have a skirt, so are more at risk. There’s a thread on here from a few months ago that covers this quite comprehensively. Quote Link to comment Share on other sites More sharing options...
GingerCat Posted December 13, 2018 Report Share Posted December 13, 2018 Never noticed a difference in performance whenever I've done it. That includes 2.5 inch carts with fibre wads. Quote Link to comment Share on other sites More sharing options...
wymberley Posted December 13, 2018 Report Share Posted December 13, 2018 3 minutes ago, GingerCat said: Never noticed a difference in performance whenever I've done it. That includes 2.5 inch carts with fibre wads. Odds are that you won't, but the thread mentioned above details what can - not necessarily will - happen with fibre and especially if the barrels are back-bored. Quote Link to comment Share on other sites More sharing options...
GingerCat Posted December 13, 2018 Report Share Posted December 13, 2018 23 minutes ago, wymberley said: Odds are that you won't, but the thread mentioned above details what can - not necessarily will - happen with fibre and especially if the barrels are back-bored. I suppose it's quite possible there would be a teeny tiny drop in performance when compared to a plastic wad or non back bored barrel however will you notice it ? The back boring isint excatly adding much to the diameter of the barrell and the fibre wad is under tremendous pressue causing it to expand and fill the void before getting shunted up the barrell in milliseconds. Quote Link to comment Share on other sites More sharing options...
wymberley Posted December 13, 2018 Report Share Posted December 13, 2018 (edited) 13 minutes ago, GingerCat said: I suppose it's quite possible there would be a teeny tiny drop in performance when compared to a plastic wad or non back bored barrel however will you notice it ? The back boring isint excatly adding much to the diameter of the barrell and the fibre wad is under tremendous pressue causing it to expand and fill the void before getting shunted up the barrell in milliseconds. I've got a distinct feeling that you could be very much surprised I'm afraid, especially if the back-bore was a la Maxus at 0.742". Edited December 13, 2018 by wymberley Quote Link to comment Share on other sites More sharing options...
GingerCat Posted December 13, 2018 Report Share Posted December 13, 2018 Doubtful. I honestly haven't noticed any difference. Quote Link to comment Share on other sites More sharing options...
figgy Posted December 14, 2018 Report Share Posted December 14, 2018 Must be otherwise all guns would have 4" chambers so you could use what cartridge length you like. Quote Link to comment Share on other sites More sharing options...
MAB1954 Posted December 15, 2018 Report Share Posted December 15, 2018 Never noticed a difference with 2.5"/2.75" in a 3" chamber, there use to be a lot of discussion about this in the 70's I had forgotten all about it. Next summer may pattern my 2.5" fibre reloads in a 3" gun, just to see if there is a noticeable effect, I suspect not. Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted December 16, 2018 Report Share Posted December 16, 2018 On 14/12/2018 at 13:35, figgy said: Must be otherwise all guns would have 4" chambers so you could use what cartridge length you like. I had a fiesta with a speedo that had 140mph, so clearly it could! Quote Link to comment Share on other sites More sharing options...
figgy Posted December 16, 2018 Report Share Posted December 16, 2018 Cookoff013 Spot on. On 15/12/2018 at 15:55, MAB1954 said: Never noticed a difference with 2.5"/2.75" in a 3" chamber, there use to be a lot of discussion about this in the 70's I had forgotten all about it. Next summer may pattern my 2.5" fibre reloads in a 3" gun, just to see if there is a noticeable effect, I suspect not. If your only looking at a 1/4" or so 23/4" in a 3" chamber you won't notice any difference. I think you may notice a loss of speed with 2" long carts shot through a 31/2" chamber. If there was no difference as I wrote why don't manufacturers make all guns with 4" chambers. Quote Link to comment Share on other sites More sharing options...
wymberley Posted December 16, 2018 Report Share Posted December 16, 2018 (edited) 1 hour ago, figgy said: Cookoff013 Spot on. If your only looking at a 1/4" or so 23/4" in a 3" chamber you won't notice any difference. I think you may notice a loss of speed with 2" long carts shot through a 31/2" chamber. If there was no difference as I wrote why don't manufacturers make all guns with 4" chambers. Because you're going to need 5" for 90 yards. Edited December 16, 2018 by wymberley Quote Link to comment Share on other sites More sharing options...
GingerCat Posted December 16, 2018 Report Share Posted December 16, 2018 Do they make a 4 inch cart? Quote Link to comment Share on other sites More sharing options...
figgy Posted December 16, 2018 Report Share Posted December 16, 2018 Ha ha dont get them started. Only 4" cartridge I can think of would be for a large bore or punt gun. Quote Link to comment Share on other sites More sharing options...
Guest cookoff013 Posted December 16, 2018 Report Share Posted December 16, 2018 There are specs for 3.5" 20gauge, but no-one is stupid enough to make one Quote Link to comment Share on other sites More sharing options...
redial Posted December 20, 2018 Report Share Posted December 20, 2018 I put the same question to a Eley rep as I was thinking of using 65mm in 70mm chambers. He said the effect would be minimal and very much doubted that I would notice any difference. I think he was right. Quote Link to comment Share on other sites More sharing options...
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