By Joe Berk
Part 1 of this series took us through brass preparation, Part 2 took us through priming, and here we are at Part 3, which discusses powder charging, bullet seating, and case mouth flare removal.
I had previously mentioned that I shoot cast bullets in my military surplus rifles, and in particular, I like a gas-checked 200-grain cast bullet. Good buddy Roy Hursman cast these for me. Roy retired and sold his bullet casting gear. I hope I’m able to find somebody that does as good a job as Roy.
I use different powders in my rifle cast bullet loads. A good one is IMR 4227, which is what I used for this .303 British load. The secret sauce recipe is 21.0 grains of IMR 4227 with no fillers. I’d like to tell you that I developed this load after extensive testing, but I can’t. It was next to what the Lyman cast bullet manual said was the accuracy load with this bullet and IMR 4227 was in my ammo components locker, so it got the nod, and it worked. I felt no need to experiment any further; the load worked well and was very accurate. This 21.0-grain IMR 4227 load is near the lower end of the loads listed in the Lyman manual. The bullets exited the muzzle at about 1600 feet per second (as tested with my Garmin chronograph), and that’s good enough for me.
I use an RCBS powder dispenser, and once I had it set up to throw 21.0 grains of IMR 4227 propellant, there was no need to weigh the charge for each cartridge because the powder meters so well. I loaded the 20 rounds like it was pistol ammo, placing each empty brass case beneath the dispenser, charging the case, and moving on. After I had charged all 20 cases, I threw another charge into my scale’s powder cup and weighed it again to make sure the dispenser was still on the money. It was (the powder dispenser released exactly 21.0 grains).
It was time to turn to the Lee Ultimate 4-Die set’s bulleting seating die. The first step was to install the bullet seating die in the press and screw it partially in.
I placed the first bullet over a charged .303 British case (charged with IMR 4227, that is) and raised the ram in the press. Observing where the bullet went (i.e., how deeply it seated in the case), I lowered the die in the press a bit more, repeating the process until I attained the desired bullet seating depth. I wanted the bullets to be seated such that the cartridge mouth was just behind the bullet’s first driving band.
After seating all 20 bullets in the 20 charged .303 British cases, it was now time to remove the case mouth flare we induced in Part 1 of this series. I probably could have skipped doing so, because I did as I advised in Part 1 (I flared the case mouth just enough to allow the bullet to enter). Even without removing the flare, the cartridges would chamber because the flare was so small. But I like to go for the extra step of removing it just to make sure.
Lee’s factory crimp die (the fourth die provided in their Ultimate 4-Die set) is what I use for removing the flare. It can also be used (as the name implies) for crimping the case mouth on the bullet.
By adjusting how far the die is screwed into the press, you can control how much force is applied to the case mouth. You can screw it in just enough to remove the case mouth flare (as I did), or you can screw it further into the press to apply as firm a crimp as you want around the case mouth.
The Lee factory crimp die does not apply a roll crimp; it applies a concentric circular flat crimp around the case mouth periphery. Some folks think this makes the Lee factory crimp independent of case length. I don’t agree with that. On longer cases, the Lee factory crimp will press more case material radially inward than it would on a shorter case (theoretically, if the case were trimmed too short, the Lee factory crimp would apply no crimp). But it’s still more controllable than a roll crimp, and the amount of roll crimp applied is far more sensitive to case length than is the Lee factory crimp. And if you wish to apply a roll crimp instead of the Lee factory crimp, you can still do so with Lee bullet seating die. Just screw the die body in further (while backing off on the bullet seater on top of the die) until the reduced diameter step inside the die body contacts the case mouth enough to provide a roll crimp.
I ran all 20 cases through the Lee factory crimp die after adjusting the die. I adjusted the die to apply just enough radially-inward force to remove any remnants of flare from the case mouth.
After completing all 20 .303 British neck-sized cartridges, I put them in a box and applied a label, as I do with all my reloaded cartridges.
How did this ammo shoot? It did well, as the target below shows. I can’t show that my neck-sized-only reloads are dramatically better than full-length resized ammo, but I know I have the other advantages offered by neck sizing (not having to lube the cases, a quicker reloading process, and longer brass life). I am quite pleased with my Lee .303 British die set.
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