Originally Posted by woolleyworm
I have found several people who have no real idea of what a small base die set does; they just assume that it must be better, when in reality, it's the exact opposite unless you have a firearm that absolutely requires it or if you have a number of semi-auto's chambered in the same caliber. A small base die set is just a FL die set that goes a few thousandths more on the sizing when set up properly. When the smaller sized case is in a chamber in which a standard FL or neck sized cartridge would fit and function properly; the small base sized case has to expand and "work" more. The brass is then worked more when resized; unnecessary if you can FL size and not have any problems.
Hope this helps explain SB die's a little bit.
Woolyworm gets an A+ on his report card.
I couldn't have said it better.
We have 9 Gamemaster 760 - 30-06 and 2 Gamemaster .270's and 1 - Model 6 Remington rifle and we have 3 or 4 sets of dies for the 30-06 of different manufacturers and two different sets of dies for the .270 and none of them are small base die's and we have never experienced any problems with getting the shells to fit in the rifles chambers.
Add to that - I have probably owned another dozen or so Gamemasters on top of that and none of them refused to chamber any of the rounds that we reloaded with any of the dies we used.
On average - we can reload our shells - back to factory standards - maybe a little over - 57 gr IMR4350 and 150 gr bullets about 6 times before we experience any brass failures.
Most times the brass tends to separate from the head-stamp about 1/2 inch to 3/4 of a inch from the bottom.
More times then not - it comes from over working the brass.
The neck of the shell is very soft and even if the bullet was too far forward - all it would do in a bolt action rifle would be to push the bullet back into the shell. You would see indications of marks in the bullet if you extracted it before you fired it if you got it to chamber in the bolt action rifle you are talking about.
Just for kicks and giggles - I would take it to a competent gunsmith and have them check the head spacing.
I would also pull the bullets out of the shells that you pushed the bullets back a little further - because I do not know how much powder you used in your loads - but 57 gr in my book is a compressed load and when you push the bullet back - depending on which brand of brass you are using - you could cause excessive chamber pressure from not having enough room inside of the brass for the powder and bullet.
Military brass tends to be thicker and the shell capacity is smaller - the amount of grains of water that the case will hold - and so at times you have to back the load off a little even when dealing with what the book says is ok.
JMHO and you can take it for what it is worth.