Re: 300 Win mag in an Autoloader
Arms Tech SMIR .300 Win Mag based on BAR II:
Innovative Technologies Belted Magnum Collet Sizing Die.
"Belted magnum cartridges have been around for over 50 years, and most shooters who reload them are familiar with the case bulge problem that occurs "just above" the belt. This usually happens after just 2 or 3 firings - wasting perfectly good cases. Many shooters have discovered this problem when they find their handloads begin to stick in the chamber, or when they no longer chamber at all.
"Unlike non-belted cases, the belt prevents the case from sizing deep enough in conventional full length dies. This limits the amount of resizing, and brass is plowed rearward toward the belt. The brass builds up just above the belt at each sizing, and cases expand. Neck sizing dies don't bump the shoulder back or resize the tapered case wall. The best solution is to full length resize accurately, and use this collet die to reduce case width.
"Our patented Belted Magnum Collet Resizing Die solves this problem and has other unique features. The top of this die is a case width gauge that shows when a little "extra" case resizing is required. This resizing die is used to eliminate the case bulge above the belt, after using your full length (or) neck sizing die. Our collet die ensures that your belted magnum ammo will always chamber properly and your cases are now able to last for up to 20 firings, even when using the hottest handloads. Our resizing die uses a collet that fits over the cartridge case until it bottoms against the belt. The case is then pressed into the sizing die. The collet allows your case to go farther into the die where it only reduces the area "just above" the belt.
"This ONE die and collet is universal and works on ALL of the popular belted magnum calibers including: .257 Weatherby Magnum; 6.5 Remington Magnum; .264 Winchester Magnum; .270 Weatherby Magnum; 7 x 61 Sharpe & Hart; 7mm Remington Magnum; 7mm Weatherby Magnum; 7mm STW; .300 H&H Magnum; .300 Winchester Magnum; .300 Weatherby Magnum; .308 Norma Magnum; 8mm Remington Magnum; .338 Winchester Magnum; .340 Weatherby Magnum; .350 Remington Magnum; .358 Norma Magnum; .375 H&H Magnum; .416 Remington Magnum; .458 Winchester Magnum; .458 Lott Magnum and several belted wildcat cartridges. There are no extra collets to buy when resizing different calibers.
"The U.S. Secret Service was one of our first customers.
"So far, we've sold over 3,100 of these dies. Unfortunately the high cost of manufacturing usually requires us to build a waiting list before each production run. These dies are in stock, so . . . . if you would like to get one, don't wait too long."
http://larrywillis.com/