For the past year I have been buying all the peripheral parts for my next build. I have everything but a BCG and Barrel. I want this to be more of a fun range gun to plink with within 300 yards. I am having second thoughts about using the .308 with such a short barrel(12.5" + Muzzle Break, probably 14" overall) I was thinking about the expansion ratios of different calibers and came to the conclusion that a .35 cal bullet with low powder volume might be the most efficient in this type of gun. My first thought was the .358 Winchester, but that still has a lot of powder behind it. What do you guys think of the .35 Remington for a SBR? Do both use the same bolt face? I already have a 20" .260 bolt(Same as .243/7mm-08/.308/.338 Fed/.358 right?) and barrel for any long range shooting. The .35 Rem has less powder capacity than the .358 Win, so the FLASH of wasted powder would most likely be less. On the other hand I could just download the .358 Win until I achieved the desired burn rate. And maybe use a faster burning powder and lighter bullet. I would like to stay with a cartridge that will allow 20 rounds in the magazine, just like the .308. I prefer Pmags(I have 10 already) so if at all possible I would like to stay with them. I also plan on using a Thick A$$ Bull barrel with dimple fluting to counterbalance my Magpul UBR stock. Does anyone know if the .358 Win Bolt will fit the .35 Rem?
