.303 Enfield ammo loaded in Pakistan in the ‘60s ages.
Badly.
Yeah....gotta watch out for cordite. Unstable & acts like a sponge, IIRC.
Only .303 I use is Prvi Partizan. I buy their 6.5 Italian for the same reason. I own some really old smokepoles.
But for serious social work, it’s 7.62 NATO. Like the Army, I have re-fallen in love with the M-14 & its variants. Fired expert with it back in 1969.
As another poster already mentioned, your ammo may be loaded with cordite. I think it was in the 60’s when it was last used. I had some cordite .303 and there were plenty that didn’t fire. You may want to check out these pages to see what you have, or just pull a bullet and dump out the propellant. Cordite kinda looks like very fine angel hair pasta.
http://www.dave-cushman.net/shot/303headstamps.html
http://enfieldking.tripod.com/enfieldking/id12.html