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The second picture, upper right group is a classic example of what loose receivers will do to an otherwise accurate rifle. Alternating rounds in the magazine put pressure on different sides of the upper and when the hammer strikes, it is free to move where it wants. I would be willing to bet the...
For reliability, it is more important to check a go-gauge. As far as safety, an extra .005-.010" of headspace is not going to "blow up" a rifle. There is plenty of factory ammo that comes up that short of a go-gauge. Compare new brass to fired brass sometime, you may be surprised. FWIW, I...
I haven't tried H4831 but I am currently using IMR7828 SSC in a 22" Creed getting 3080 fps. Re-23/26 will also get good speed without the pressure of H4350. My 26" 243 was getting just under 3200 fps with 7828.
Going from 27" to 22" in a 6mm Creed changes the 1000 yard drift (10 mph) by 0.3 MOA or less than 0.1 Mils. The 243 is still a great cartridge but the 6mm Creed beats it in one area, off the shelf match ammo. The 243 is neutered by SAAMI.
I have always been a 243 fan but the 6mm Creed is just too easy, less trimming and they flat out shoot. H4350 is the easy (and popular) option but it is on the fast side for the heavies and has contributed to the short barrel life reputation. IMHO they dicked up the freebore on the SAAMI reamers...
Hornady, Sierra, and Hodgdon have published load data on this cartridge now. For those trying H1000, you either need a drop tube or learn how to settle powder to get the most in the case. There are better choices than H4350 for brass and barrel longevity.
I experimented with case capacity using 6mm Creed brass necked up and it was only 0.5 gr less water than 7mm-08 WW brass. Edit: I should clarify, I entered the weighed case data into QL and the 0.5gr difference is in useable capacity after seating a 162 Amax to 2.9".