Thread: 303 MK7 load data?

Originally Posted by Old_School

@grandpamac Another thing that come to mind, I was told that ideally with 303 in particular, due to sloppy machining in the chambers, etc that its best to only do neck sizing and not do a full length resize, as it shortens the life of the cases if done too much.
Is this something you recommend?
If i go down that path however, I believe that you should only continue to use that ammo in the same rifle you shoot it with, so would mean I would need to seperate them for use in different rifles?

Greetings @Old_School,
I load all of my old soldiers using reduced loads and neck sized cases. I use a Lee Loader for depriming and neck sizing. Both of my current .303 rifles are scoped so there is no problem with sight adjustment. Previously I had bee using reduced loads and neck sized cases in my .308 for 4P shooting at 100 metres with 38 or 40 grains of AR2206H with 150 grain projectiles so when I needed an iron sight rifle was needed I used a No4 rifle with a Parker Hale sight. The barrel was in reasonable condition other than an eroded throat and chronographed a little over 1,900 fps with 40 grains of older AR2209 and the 174 grain RN in neck sized cases. The two current .303 rifles here both have near new barrels wit a crush fit for projectiles around 5mm shorter than the iron sight rifle. You will need to keep separate batches of cases for each .303. More later.
GPM.