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Hot Topic (More than 10 Replies) ID strange cartridge in Ballard Pacific (Read 1089 times)
Hiwall55
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Re: ID strange cartridge in Ballard Pacific
Reply #15 - Oct 11th, 2019 at 4:10am
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I think a .016 squeeze to get to groove diameter will leave some serious finning on base of bullet, not conductive to stellar accuracy.
  
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rgchristensen
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Re: ID strange cartridge in Ballard Pacific
Reply #16 - Oct 11th, 2019 at 4:48am
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Hiwall55 wrote on Oct 11th, 2019 at 4:10am:
I think a .016 squeeze to get to groove diameter will leave some serious finning on base of bullet, not conductive to stellar accuracy.


       As I have mentioned before, one of the Swiss rifles in cal 7.5mm GP90 shoots near MOA with bullets that are 0.029" over groove diameter.  In fact, the FIRST 10 shots out of it made a group about 1.1".

CHRIS
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Spud
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Re: ID strange cartridge in Ballard Pacific
Reply #17 - Oct 11th, 2019 at 7:01am
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I'm sticking with my usual 20-1 alloy as the .436" projectile is only .002" over the barrel's groove dia. of .434". I'll see how it goes as I feel a soft slug might bump up a bit too much as it passes thru that freebore section. Has anybody seen a long freebore such as this on other Ballards? Was there a "standard" length? I'm assuming that freebore assisted with the seating of cartridges loaded with PP projectiles.
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oneatatime
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Re: ID strange cartridge in Ballard Pacific
Reply #18 - Oct 11th, 2019 at 12:16pm
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In my "44" Wesson Extra Long the chamber at case mouth is .458, the freebore is .330 long with a .443 diameter, and the groove size is .421. I neck size to hold a .421 bullet which is seated long enough to touch the rifling and the accuracy is excellent with zero leading. You never know...
  
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Spud
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Re: ID strange cartridge in Ballard Pacific
Reply #19 - Oct 11th, 2019 at 6:40pm
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Oneatatime, thanks that gives me hope. Your set-up sounds pretty much what I'm doing now. Will test it out.
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semtav
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Re: ID strange cartridge in Ballard Pacific
Reply #20 - Oct 16th, 2019 at 11:49pm
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That cartridge is just a tad off from being a dead ringer for a Wesson 42-100 Dave Cook made. I have a similar but uses the 45 2.4 case.
But They'll were .429 groove.
I have a couple .430/ 431 moulds that might work. For groove dia paperpatching.
  
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