Thank you guys for the advice
Was initially planning to stop at 39.5 but following the above advice I will do the following 7 increments:
37-37.5-38-38.5-39-39.5-40
4 shots in each group, 50m.
And see if there are a few of those 7 that are interesting or at least as good as the PPU.
It's a very elegant No4 Sporter, a Parker Hale commercial conversion, light like a 22 LR (my reason for not going for a 174gn/2208 load), cute stock with a good barrel and the singer sight.
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Pistol Primers: i have heard so many Okay reports, want to try as I will get those pistol primers for cheap. I would think that of all military calibers, 303 is maybe the closest to a pistol calibre: low capacity, big calibre, and I am using a relatively fast powder. I would not try a pistol primer in a 6.5x55 case loaded with 46 grains of 2213 SC!! Rather a large rifle magnum in that case.
The Super case: once upon a day, someone gave me a box of Super 303 ammo. 140 grains. Very old, price on the box was like 3$.
I shot one. The neck of the case had litteraly crumbled, 1/3 rd of the neck had just gone missing!