Where on the ogive is the preferred diameter for reference?
Does it matter if the boattail length varies from base to heel across several bullets?
Bullet Sorting?
- Thread starter wkdickinson
- Start date
Does it matter if the boattail length varies from base to heel across several bullets?
Bart, since the Juenke instruments are rare and expensive (as far as my budget is concerned), do you know of anyone who makes bullet spinning collets. It would seem like a useful and economical way to test bullets. (I already own a Dremel tool and amp meter.) I figured maybe Sinclair but didn't find anything like it on their website.
The 06 did seem to jump around a tad, is that what you see?
No.
But anyone who makes bullet forming dies has the skills, knowledge and shop tools to make them. They may well use the reamer that shapes the pointing die. Arvie Martin made the one used at Sierra.
Wayne! Where have you been. I have been sorting my bullets by weight and base to ogive. I then load my bullets all within the same base to ogive starting at the lightest weight going to the heaviest. I use the sinclair sorting tool for the base to ogive measurement. Please contact me if you have any questions.
While many measure components to the nth degree of precision and exact, one example decades ago challenges all that stuff.
Half dozen folks loaded new cases 210M primed with different powders and charge weights under a prototype lot of Sierra's then new 155 grain 30 caliber Palma bullet. 20 shot test groups at 1000 were made then assed. The most accurate load was selected.
A couple thousand or so rounds were loaded on two Dillon 1050 progressive machines. New Winchester cases with 45.3 grains (3/10ths spread) under the bullet (.003" max runout) was machine rest tested at 600 yards, 20 shots in 2.7 inches. That group was pictured in a fall 1991 issue of Handloader magazine.
Half dozen folks loaded new cases 210M primed with different powders and charge weights under a prototype lot of Sierra's then new 155 grain 30 caliber Palma bullet. 20 shot test groups at 1000 were made then assed. The most accurate load was selected.
A couple thousand or so rounds were loaded on two Dillon 1050 progressive machines. New Winchester cases with 45.3 grains (3/10ths spread) under the bullet (.003" max runout) was machine rest tested at 600 yards, 20 shots in 2.7 inches. That group was pictured in a fall 1991 issue of Handloader magazine.
Yes, drag and BC will vary.
Sierra shortened their 30 caliber 180 HPMK boattail to that of the 168 HPMK as a cost saving effort. They were often no longer supersonic through 1000 yards shot from 308's.
They made their 175 HPMK with the longer original boattail to ensure they stayed fast enough.
Sierra shortened their 30 caliber 180 HPMK boattail to that of the 168 HPMK as a cost saving effort. They were often no longer supersonic through 1000 yards shot from 308's.
They made their 175 HPMK with the longer original boattail to ensure they stayed fast enough.
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