Heym SR20
Well-Known Member
I am seeing 3200 fps from the factory load for Fox ammo which is 1800 odd ft lbs. I am running a 24” barrel.I'd suggest you check up on that. That isn't the case with most lead free factory offerings not hitting the energy requirement due to low velocity... especially when you add in short barrels.
The majority of lead ammo I've tried including 100g have always been spot on for velocity. Even norma 100g are up at 3kfps whereas RWS and Lapua lead free seem to be around 2800-2850. You've got the CX loads which are around 3kfps but are a light bullet and dont meet requirements, certainly not here in England.
I would suggest that 243s with short barrels probably don’t make muzzle energy requirements regardless of bullet type.