by Baldrick314 » 29 Apr 2015, 11:10 pm
Varmtr wrote:Actually 303 is an odd ball measurement. The 303 is measured from land to land but groove to groove the 303 can range from 0.310" - 0.312". Hence you will see 303 projectiles measure around the 0.311" dia, the Russian 7.62x39 can be the same depending on barrel and were the ammo is made.
So to get a better barrel clean of the rifling grooves you are better to run the 303 size brush ( which would be slightly bigger than the 30cal brush ) or a 8mm brush.
If you are using the old berdan primed 303 ammo after shooting it's best to put boiling hot water down the barrel first. The old 303 ammo is mercuric primed and this causes corrosive salts in the barrel hence boiling water to get rid of it. Then proceed with the normal cleaning.
Just for interest what model 303 and ammo are you using Baldrick ?
Yeah I was aware of the odd measurement, that's why I was asking if there was benefit to using a larger brush.
I don't currently have a 303 in the collection, previously owned a No4MK1. Hopefully I'll get another SMLE in the future. When I had it I was shooting factory ammo so no corrosive primer issues
.177, .22lr, .22-250R, 2x .308W, .30-30W, 7.62x54r, 8x56r, 9x19, .357 Mag, 12GA