Floating reamer experiment

[LVLAaron]

I have plenty of barrel sections I could test this with. I always dial on the bore and use a JGS floating holder... but I'd be curious what the neck/throat alignment would look like if I just put a segment in the 6 jaw and dove in.

I was thinking through this a bit.

I pre-drill and bore chambers. It's critical that that the section you bore aligns perfectly with the barrel's natural bore. If the barrel was not straight, but then bored a straight body, the reamer would follow the body until it got up to the neck and then possibly give an oversized chamber, kind of like OP described. You'd have this: ><

But.... if I didn't pre-drill and bore I think the reamer might stay true enough to keep things consistent. I'll pick up a roughing reamer / chamber core drill and see what happens.