After considerable examination of data posted here http://www.blaserbuds.com/forum/viewtop ... 9&start=60 and here http://www.blaserbuds.com/forum/viewtop ... 42&t=12963 I decided to run 55, 56, 57 & 57.5g of 2207 under the 350g Woodleigh RN and 52, 53, 54 & 54.5g under the 400g Woodleigh PP in Bertram brass lit by 210 primers.
Results were interesting
The 55, 56, 52, 53, & 54g loads exhibited backed out primers. The upper loads 54.5, 57 & 57.5 had some primers sitting flush and looking "normal" with others backing out then noticeably riveting into a pancake.
The amount of soot around the casenecks didnt vary with loads but starting loads dont appear to have gripped the chamber wall at all.
The backed out primers to my eye indicate an excess of headspace - with virgin Bertram brass, anything is possible
- and whilst the flattened primers look worrisome spent primers can be put into virgin brass indicating the pockets didnt stretch in firing If a headspace issue I was hoping any difference in shoulder position would stick out like the proverbial between fired and virgin brass but my eyes cant see it
Time to get out the micrometer
