Thread: BSA 243 at the range

so, reloading experts, here's my story with a conundrum.

First time I've shot this 243. Barrels a 1980s/1990s Collings 22 inch. Rifle is mid to late 1950s.

Shot 3 x 3round groups of factory 100g corelokt at 50m- about 1 inch /1.5inch.

Shot a bunch of 3 shot groups with 95g Targex at 100m- barrel never more than warm.
Node at 41 g of 2209 was half inch ish for 3 shots at 100m.

Shot some 90 or 95g Sierra Gamechangers at 100m
3 shot groups= 10 to 12 inches each group.

Boy this barrel does not like these Sierra pills- have read others have had same in 243.

Got home- Boretech Eliminatored the shit out of the barrel- 15 mins wet and rested- 4 x over- the copper fouling was heavy- but subsided towards the 4th set.

1. Will the problem be the Sierra pills, or my barrel is old and collects copper after 30 shots/ clean barrel seemed to shoot great with Targex pills.
2. Will polishing the bore with Bore paste help?


Thoughts?


P.S, geeze shooting a 243 is sooooo easy compared to me 300wsm Tikka