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by LBD
Wed Aug 28, 2013 6:29 pm
Forum: design & sizing
Topic: Bore ride diameter
Replies: 7
Views: 5493

Re: Bore ride diameter

With all due respect, it is not my intention to enter into a debate on cast bullet design, I simply want to understand your capabilities. What I've gleaned from this discussion is that you do not have the capability to hold a bore riding section to plus or minus .001" of the dimension selected ...
by LBD
Tue Aug 27, 2013 5:30 pm
Forum: design & sizing
Topic: Bore ride diameter
Replies: 7
Views: 5493

Re: Bore ride diameter

What firearm were you planning to shoot this in ? As many .35's as possible. Imagine RCBS 35-200-FN without a crimp groove but with a forward driving band .160" long to accommodate various seating depths and a "Lee Factory Crimp" for revolver use. Also, instead of the deep 1/2 round ...
by LBD
Tue Aug 27, 2013 1:38 pm
Forum: design & sizing
Topic: Bore ride diameter
Replies: 7
Views: 5493

Re: Bore ride diameter

Are you indicating, if I were to specify a bore ride diameter of .351" and length of .06" on a 215 grain .35 caliber rifle bullet (I'm trying to modify RCBS 35-200-FN to fit my .358 and .357 somewhat better) that it (the bore ride diameter) could end up .349" in diameter or smaller ev...
by LBD
Tue Aug 27, 2013 11:26 am
Forum: design & sizing
Topic: Bore ride diameter
Replies: 7
Views: 5493

Bore ride diameter

Mtngun, What would be the tolerance on the bore riding diameter of a 215 grain .35 caliber bullet (casting with a 3-cavity XL aluminum mold and approx. 650F WW metal)? In your app, the label associated to the bore ride pull-down menu is "nominal". Are you saying that the bore ride diameter...
by LBD
Tue Aug 20, 2013 2:37 pm
Forum: design & sizing
Topic: Gas check shank lengths
Replies: 3
Views: 3929

Re: Gas check shank lengths

Thanks for your quick reply. The shank length includes the bevel. I'm sorry, I should have asked you how long the bevel is just ahead of a .3425" diameter straight shank... is it < .010" (I'm referring to a bullet that has an As-Cast diameter of .361")? Upon firing, the shank obturate...
by LBD
Tue Aug 20, 2013 11:53 am
Forum: hi velocity
Topic: Tom Gray's Thoughts on Throats and High Velocity
Replies: 10
Views: 4585

Re: Tom Gray's Thoughts on Throats and High Velocity

Tom buys into the "bands-stripping-in-the-rifling" theory of what limits cast bullet accuracy. I tend to disagree. I think my experiments with Loverider bullets have demonstrated that even itty bitty bands are able to hold the rifling without stripping. ...However, it is a fact of physics...
by LBD
Tue Aug 20, 2013 10:52 am
Forum: design & sizing
Topic: Gas check shank lengths
Replies: 3
Views: 3929

Gas check shank lengths

When selecting a gas check shank length, does the length parameter refer only to the cylindrical portion of the shank, or does it also include the bevel joining the cylinder to the trailing band? Here's a more theoretical gas check shank issue: What are the pros and cons of stepped gas check shanks ...

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