Barrel contour #3 or #4

[stratocaster]

I am in the process of have a 280ai built on a 700 action.  I'm a little unsure of which barrel contour to use.  I am trying to keep this gun as light as possible.  My concerns are do I go with the #3 sporter in favor of weight or do I go with the #4 sporter in an effort to be able to fireform more brass without the barrel heating up too much too fast?  I'm using a 25" barrel and the weight difference will be around 6oz (give or take).  I know I can always make up the 6oz somewhere else (light weight scope mounts, ect).  Will there be any potential accuracy increase with the #4.  It will be used primarily for a big game gun, not a p-dog gun.
Thanks

[jhm]

Stradocaster:  If it was me I would go with the #3 if the fireforming is your only reason/concern for the #4 as you can fireform a lot of brass with a lower charge load and wont be heating it up that much, one day at the range and you can fireform a lot of brass, and if you dont really need or want the extra weight you are stuck with it.   JIM

[gunnut69]

I too would use the lighter conture. Fireforming is a one time thing in a rifle used for big game hunting. Once the brass is ready it's ready...  I prefer a relatively light rifle my self.. Accuracy will be more a factor of the quality of the barrel and it's installation than it's weight. For big game hunting even the featheriest of tubes will provide all the accuracy needed.