Measuring Ogdives?

[Propdoc03]

So I went to slip fitting (no case sizing) for my Pedersoli falling black with some 530 Saeco's. This rifle\load is to only be used for silhouette. I have a new order in of some Match Select bullets that have been sized and sorted  +-.5 grn. It took quite a bit of trial and error to figure out where my .060 wad needed to be once compressed with my compression die so that my bullet would sit right on it when dropped in yet still be up against the rifling. I actually had it set up so that the block would push it into the rifling/chamber. I am trying to measure this new lot of bullets with my Stoney Point guage but there really is no deffinite ogdive. If I take a measurement yet push a little more the bullet just slips right into the collet. I dont quite understand how this chamber is cut. Am I actually going into the rifling or is it engaging a throat before the rifling? The reason I am asking is I can feel start into something and then continue for probably .06 when measuring. All I need is for it to help center the bullet while holding it up against the wad. I am wondering if I am trying for the gnats ass when all I might need is the gnat. Also, what is your method for figuring out how far to seat the wad so that your OAL sets the bullet right on it? Does not having the bullet sitting on the wad lead to chamber ringing?
Thanks PD

[Propdoc03]

This lot of bullets actually came withing .002 ( could be me) of the last ones so I have that all set. I still am interested in how the chambers are cut in these falling blocks and wheather a gap between the wad and bullet can cause chamber ringing. Seems I have read that it did?

Thanks PD

[The Shrink]

Propdoc

There appears no standard chamber cut on "falling block" rifles.  Even Shiloh Sharps chambered some for PP bullets and others for lubed bullets.  To determine how your rifle is chambered will requrire a chamber cast.  Cerrosafe is available from Brownells and I think from Buffalo Arms.  Once youn see that cast you will know exactly what is happening when you chamber that bullet.  

Wayne

[Cuts Crooked]

Listen when The Shrink Speaks! He knows wat he's talkin about in this issue!  A chamber casting is the onliest ay ta know fer sure wat ya need fer seating depth. Sure ya can "fit 'n try" but to be one hunnert % positive, that chamber cast will do the trick! It's cheap 'n easy too!

BTW, My Pedersoli Roller is throated so long that I cannot load some slugs out far enuff to take advantage of all the room I got there, particularly the spire point shapes. When they get too long I run into the hammer with the case rims when loading! :eek:  That's why I'm planning to mill about 1/8th off the top of the hammer soon!

Some folks like to have the slug jist "kissing" the lands, some like to have them a bit into the rifling, and some like them jist a thin hair off the rifling. I think it's a matter of finding wat yer particular gun prefers. Although, truth be told, I'm not a good enuff shot for this kind of fiddling to make perceptable difference in my groups. :oops: