Yes it is

thanks kevin i have asked a dozen or more gunmen this question and get a 50/50,yes and no,s,,i dont like porridge.

Hi Below is the list of home office designated obsolete callibers, you will find several types of 10.4mm so match yours and enjoy :-) .22 Extra Long Maynard (B) .22-15-60 Stevens (B) .22CF (E&B) .230CF (E&B) .25/20 Single Shot (B) .25/21 Stevens (B) .25/25 Stevens (B) .250 Rook (or .297/.250 Rook) (H) .255 Jeffrey Rook (H) .275 Jeffrey (H) .276 Enfield P.13 (Hu) .28/30/120 Stevens (B) .297/.230 Sporting (H) .297/.230 Morris (H) .298 Minex (H) .300 (.295) Rook (H) .300 Sherwood (H) .300/.250 Rook (H) .30/30 Wesson (D) .30/40 Wesson (D) .310 Cadet (H) .310 Greener .31 Thuer .310/.300 Rook (H) .320/.230 Rook (H) .32 Protector (W&M) .32 Long Rifle CF (NB recommended for Section 58(2) in rifles only) (B) .32/35 Stevens (D) .32/40 Remington-Hepburn (D) .32/40 Bullard (B) .32/ 40 Winchester and Ballard (B) .32 Ideal (B) .32 - .44 Smith & Wesson (W&M) .320 British (also known as the .320 Revolver C.F., Short or Long) (W&M) .35/30 Maynard (B) .35/40 Maynard (B) .340 Short or Long Revolver (W&M) .360 Thuer .360 Rook (also known as the .360 No. 5 ) (H) (recommended for S. 58(2) rifles only) .360 shotgun .360 Westley Richards No.3 Express (H) .360 No.3 Gibbs (H) .360 Gibbs No.4 (also known as the .380 Gibbs No. 4) .360/.300 Fraser (H) .360 2 7/16 Black Powder Express (H) .360 2 3/4 Boxer (H) .369 Purdey (H) .38/35 Stevens Everlasting (D) .38/40 Ballard Everlasting (D) .38/40 Remington Hepburn (D) .38/45 Bullard (D) .38/70 Winchester (D) .38/56 Winchester (D) .38/90 Winchester (B) .380 Black Powder Express (also known as the .380-21/4 Rigby and .360-21/4) (H) .380 Long Rifle (NB recommended for Section 58(2) in rifles only) (H) .40 / 40 Maynard (B) .40/.50-70 Caliber Reduction Exptl.(H) .400-2.5 inch Kynoch (H) .400-3.25 inch Boxer (H) .400-3 inch Purdey (H) .40/60 Marlin (D) .40/60 Winchester (D) .40/60 Maynard (B) .40/70 Ballard (D) .40/70 Sharps Necked (D) .40/70 Sharps Straight (D) .40 / 70 Maynard (B) .40 - 70 WCF (B) .40/72 Winchester (D) .40/75 Bullard (D) .40/82 Winchester (D) .40/90 Bullard (D) .40/90 What Cheer (D) .40/50 Sharps Straight (D) .40/65 Sharps Straight (D) .40/65 WCF (D) .40/90 Sharps Necked (D) .40/40 Maynard (B) .40/60 Maynard (B) .40/63 Ballard (B) .40/65 Ballard Everlasting (B) .40/70 Maynard (B) .40/70 Peabody What Cheer (B) .40/85 Ballard (B) .40/110 Winchester Express (B) .400 2 3/4 Westley Richards (H) .402 Enfield-Martini Exptl. (H) .42/.50-70 Caliber Reduction Exptl. (H) .425 Webley (H) .425 Webley 1 5/16 (H) .430 Long Rifle (also known as the .430 Long Revolver) (W&M) .430 Revolver (W&M) .44 Thuer 44 Morse necked (H) .44-50 Meigs (H) .44 Dupee rimless (H) .44/60 Creedmore (D) .44/77 Remington (D) .44/90 Sharps 2 7/16 inch (D) .44/90 Sharps 2 5/8 inch (D) .44/90 Remington Special (B) .44/95 Peabody What Cheer (B) .44/100 Maynard (H) .44 Evans Short and Long (B) .44 Devilliers (W&M) .440 Revolver (W&M) .440 Long Revolver (W&M) .440 Nagant (Argentine model) (W&M) .442 Carbine 1.025" (H) .442 revolver (also known as .44 Webley) (W&M) .442 Long Revolver (W&M) .44 Colt Revolver (W&M) .44 Remington Revolver (W&M) .44 S&W American (W&M) .44 Merwin Hulbert Long (W&M) .44 Merwin Hulbert Short (W&M) .44 S&W Russian (W&M) .45-85 Ward Burton Exptl. (H) .45/.50-70 Caliber Reduction Expti. (H) .45 US Exptl, 1869 (H) .45-200-500 Winchester Exptl. (H) .45 Boxer-Henry Long Chamber 1869 (H) .45 New South Wales Police Carbine (H) .45 Gardner & Gatling (H) .45 Mars Long (W&M) .45 Mars Short (W&M) .45 MP (very rare Maxim Pistol round mentioned in the ‘Journal of the Historical Breechloading Smallarms Association’ Vol2 No6 Page 24) .450 No. 1 Bland (E&B) .450 Soper 2.5 inch (H) .450 Needham (H) .450 No. 1 Musket (H) .450/.360 Purdey (H) .450/.350-2 3/8 inch (H) .45/75 WCF (Hu) .45 Brown Standard Military Target Rifle (D) .45/50 Sporting (D) .450/ .400 Black Powder in case lengths of 2 3/8", 2 7/8", 2 19/32" Thomas Turner No 2, 2 ¾" Westley Richards and 3 1/4. Also the .450.400 3" Jeffrey (H) .450 Black Powder Express in case lengths of 1 ½", 2 ½", 2 9/16", 2 6/10", 3", 3 1/16" and 3 1/4" (H) .45/125 Winchester (B) .45 Turkish Peabody (also known as the 11.43 x 55R Turkish) (B) .46 Winchester (H) .461 Gibbs No. 1 (H) .461 Gibbs No. 2 (H) .476 Indian Police (H) .48 Morse (H) .490 BSA (H) .50/.58 Morse sleeved (H) .50 Morse (H) .50 Meigs (H) .50-.48 Meigs (H) .50 Peabody (?) (H) .50 Spencer Carbine (H) .50 Springfield Cadet (H) .50-70 Springfield (H) .50 Daw`s Patent 1867 (H) .50 Boxer 1867 (H) .50/50 Maynard (B) .50/70 Maynard (H) .500

Thanks kevin does it matter if its rimfire or centrefire ?.

Hi The specific 10.4 rounds mentioned are as below:- 10.4mm x 56R Swiss (H) 10.4mm x 42R Swiss Vetterli (H) 10.4mm x 38R Martini-Galland (D) 10.4mm Swiss M.1878 (W&M) 10.4mm x 47R Stahl (D) It is not important if it is rim or centerfire. If its on the list you are clear. Is yours 10.4 Swiss M.1878 by any chance?

thanks kevin i dont own one just interested,if you have heard a rumour about a friend of mine buying a old house and finding over 100 antique revolvers and pistols in a bricked up pantry,,its not true.

ALL rimfires, other than the various .22s and 9mm are considered to be obsolete, as are pinfire and any other non-centre fire calibres.