Great to keep the thread alive! Reloder 7? I'll have to go back thru the posts, not a powder I remember being discussed. Good to know! And good shooting at 250 yards!!
I had my Rossi 92 out to chrono some Vihtavuori Tin Star N42C . Not sure it is made any more but was developed i understand as a smokeless analogue for BP for CAS. I had high hopes that a lightly compressed charge would overcome bullet recession issues. I got reasonable accuracy from the 20" barrel at 50m with cheap Hawke River coated 250gn FP projectiles from Delta Mike, certainly M.O.D. My max load had the bullet firmly seated on the powder to the point where if seating deeper was attempted the neck tension was unable to hold the compression thus springing the bullet back. Nevertheless, the 4th bullet in the tube did recess about 4mm. None of the prior loads did. Velocity for this load was early 1400s fps. Giving quite a good shoulder thump. One case had a very slight split at case mouth after firing. No other pressure signs.
Most accurate was a couple of half grain steps back, with the bullet lightly touching the powder, heaviest crimp I could manage. Velocity in the upper mid 1300s. Plenty really for the task. No signs of recession with 4 in the tube.
I have acquired a mini tube cutter. Employing that is the next task.
One issue I have with the rifle is an in-consistent very light nick/ding appearing in he edge of fired case mouths, from first firing. I can find no pit or roughness in the chamber at the throat, but I guess it must be there. Unless it is happening on extraction. I think I'm going to have to borrow a bore scope one of these days
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