Thread: Case neck sizing and effect on accuracy

Originally Posted by foxhound

I have just started neck sizing for my 243 after full length for years. Taking careful measurements the difference between the bullet diameter and the neck sized is 2 thou. does the full length sized give more neck tension? I measured maybe 3 thou. Im using lee dies but felt the bullets could still be pushed further in by hand if I was rough with them after neck sized so I bought a lee crimper. From shooting at the range not much difference in group sizes between the 2 loads. Gun is a Remington SPS in 243. Need to start with new once fired brass and start again maybe the brass has gone hard in the neck and need annealing which I haven't had a go at yet. Any input or advice?

Different dies will give slightly different sizes on the neck.
You don't need much tention at all. What you have is probably fine. But if you wish you can experiment. In saying that you can also change jump or powder weights to tune. it's probably easy to leave tention as is and experiment with other things first. If you have too much neck tention it can upset concentrcity.
You can polish expanderballs or lube inside the neck with graphite as well if your into experiments. It's a big old rabbit hole the reloading game. Simple is always good.