No idea - guess they are oversize. Simply pointing out that even Kynoch didn't have a specific .423 brush. All the more reason to avoid brushes altogether in my book

Quote:

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Over the years we have found it impossible to get the correct size cleaning bronze BRUSHES and JAGS for the big bore rifles. As we like to keep our proof barrels clean and clear of fouling we have commissioned a small run of brushes jags in the following calibres. They will fit the standard Parker Hale yellow cleaning rod.
.375 to cover .375, .360, .380 calibres
.400 to cover .400 P, .404, .405, .450/.450, .416 and .425 calibres
.450 to cover .450 and .458 and .461 calibres
.475 to cover .465, .470 and .475 calibres
.500 to cover .500 NE, .500 BP, .505 Gibbs, .500 Jeffery, .577/500 calibres
.600 to cover .577 NE, .577 BP, .600 calibres
The jags are packed individually and are priced as follows for retail sales:
BRUSHES JAGS

.375 £4.20 N/A
.400 £4.20 £7.70
.450 £4.40 £7.70
.475 £5.00 £8.90
.500 £5.55 £8.90
.600 £6.60 £11.15
FULL SET JAGS OR BRUSHES £27.15 £38.10

CLEANING SPECIAL SET OF BRUSHES AND JAGS £56.00

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