Frank46
01-12-2006, 04:24 AM
Well the saga continues. Have some ideas I wish to run past you, so any comments are welcome. First off here are the dimensions of the bbl. .355 land to land, .368 groove to groove, throat .369-.370. Using one of Bullshops boolits I purchased from him I want to enlarge the design. The .355 nose when inserted into the muzzle does give good resistance when putting it in and taking it out.
Since the groove to groove dimension is .368 and throat is .369-.370 I want a fatter boolit. I figure max at .372 so as to be able to size down to .371-.370.
The driving bands would be .372 max. The lube grooves would be .335 wereas the origionals were .340 this would give some extra lube. The gc shank would be enlarged so as to take a .375 gc. i measured the gc shank on lyman #375449 for the 375-38-55 at .350 and the od of a hornady gc at .385. I'm reasonably sure redesigning the origional boolit to take a .375 gc is doable and would give better sealing off of the rest of the boolit from the powder gasses. I would keep the semi spitzer nose except with a .150 meplat. Think I covered all the bases, the length of the redesigned boolit would only be about 25 thousandths longer 1.150
vs 1.125 origional boolit. So if anyone has any comments I'd sure appreciate them
Frank
Since the groove to groove dimension is .368 and throat is .369-.370 I want a fatter boolit. I figure max at .372 so as to be able to size down to .371-.370.
The driving bands would be .372 max. The lube grooves would be .335 wereas the origionals were .340 this would give some extra lube. The gc shank would be enlarged so as to take a .375 gc. i measured the gc shank on lyman #375449 for the 375-38-55 at .350 and the od of a hornady gc at .385. I'm reasonably sure redesigning the origional boolit to take a .375 gc is doable and would give better sealing off of the rest of the boolit from the powder gasses. I would keep the semi spitzer nose except with a .150 meplat. Think I covered all the bases, the length of the redesigned boolit would only be about 25 thousandths longer 1.150
vs 1.125 origional boolit. So if anyone has any comments I'd sure appreciate them
Frank