I don't get it

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  • Last Post 28 September 2018
  • Topic Is Solved
Ross Smith posted this 27 September 2018

As I under stand it, when you taper bump you make your bullet fit what part of the throat? and what part of the bullet is swaged larger? In my Ardito, there is a .536 straight freebore of .3105, and a short leade to the rifling. From what I can tell, the bullet touches the chamber throat on the driving bands only and the forward part of the bore rider bullet never touches till the rifling is reached upon firing. Maybe this bullet should be fully breach seated.

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OU812 posted this 28 September 2018

Your throat does not have a taper cut. It has a long free bore cut designed for LBT long bearing surface bullets. Veral believed in cutting longer free bore with his non tapered bullets, but cutting only .0005-.001 larger than groove diameter. You could try one of LBT's longer bullets or a bore rider with longer bearing surface to fill up free bore. I am sure Ardito experimented a lot with different designs and velocities.

I would first try a bore rider with long bearing surface something like this. Size bullet for a close slip fit in free bore and seat bullet in case very long griped at gas check area. Fitting bullet is the hardest part...maybe bore ride section fits...you want a slip fit there to. I can send you a few to try.

Pat may have some of the longer LBT designs you could try. Fitting those would be much easier and probably more accurate?

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Ross Smith posted this 28 September 2018

Sounds great. I just cast, gc'ed and lub-sized some xcb's from noe. They are a little short but might work well in the 14"twist. I have several bore riding molds, but the only hope for them would be if I can get the ogive into the rifling. 

So people that bump their bullets have a shorter throat and are getting the fore part of the bullet to fit the tapered part of the throat?

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OU812 posted this 28 September 2018

Yes. Just ask Ken.

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OU812 posted this 28 September 2018

You really need to fill up the empty free bore area to get Max support of bullet. Seat the xcb bullet long and it may shoot, but I doubt it will accurately.

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