I am in the process of transforming a somewhat unusual gun, a T/C Icon. It is currently chambered in 7mm RM, and I want to get it re-barreled to .338 WM. Because the rifle has an internal box mag (Remington BDL-style) with an internal dimension of 3.500", I want to have my chamber/throat cut such that I can get close to (and chase, if necessary) the lands with my projectile(s) of choice while still allowing for feeding out of the the somewhat stubby internal mag.
I rolled into Cabela's the other day, and bought a box of off-the-shelf 338 WM ammo... and have come across a used set of dies that I can use to assemble the dummy rounds after I (bullet) hammer the projectiles out of the cases and dispose of the powder. The idea is to take the new cases, get a hold of a box of the projectiles that I want to use (Berger 250 grainers), and put together some rounds with the COAL that I want... then providing those rounds to the 'smith and asking him to chamber my barrel to match. Pretty good plan, right? Right.
Anyhow, here's where I run into a question: what can I do to get the shoulder of my cases moved out to meet SAAMI chamber specs? I'm asking because sometime back, I compared some off-the-shelf FGMM loaded ammo (in .260 Rem) to a Forster GO gauge (using the Hornady case comparator set) and found that the cases on the FGMM loaded rounds were, on average, .007" short of SAAMI length at the "datum" line ("datum" is in quotes because I don't know that I actually measured to the datum line, only that the point of measurement between the FGMM cases and the GO gauge were the same because I used the same insert from the case comparator set).
Is it a situation to where I can ask that the chamber be cut to SAAMI dimensions, while the throat is cut to accommodate the ogive of my projectiles at my desired COAL? This is my first go 'round with this sort of thing, so I admit that I may well be overthinking it... thanks for any help/advice.
I rolled into Cabela's the other day, and bought a box of off-the-shelf 338 WM ammo... and have come across a used set of dies that I can use to assemble the dummy rounds after I (bullet) hammer the projectiles out of the cases and dispose of the powder. The idea is to take the new cases, get a hold of a box of the projectiles that I want to use (Berger 250 grainers), and put together some rounds with the COAL that I want... then providing those rounds to the 'smith and asking him to chamber my barrel to match. Pretty good plan, right? Right.
Anyhow, here's where I run into a question: what can I do to get the shoulder of my cases moved out to meet SAAMI chamber specs? I'm asking because sometime back, I compared some off-the-shelf FGMM loaded ammo (in .260 Rem) to a Forster GO gauge (using the Hornady case comparator set) and found that the cases on the FGMM loaded rounds were, on average, .007" short of SAAMI length at the "datum" line ("datum" is in quotes because I don't know that I actually measured to the datum line, only that the point of measurement between the FGMM cases and the GO gauge were the same because I used the same insert from the case comparator set).
Is it a situation to where I can ask that the chamber be cut to SAAMI dimensions, while the throat is cut to accommodate the ogive of my projectiles at my desired COAL? This is my first go 'round with this sort of thing, so I admit that I may well be overthinking it... thanks for any help/advice.