Tell me about the 414 Supermag...
It was a dark and stormy night, suddenly, a shot rang out. It was the butler...
I used Lil-Gun with a 210gr XTP, not the maximum load, but a chronographed 2,000fps from a 16" Contender...
I asked Western for some CB loads. Their reply:
Since we
do not have any specific
lab tested data on this caliber, we can provide you with some guideline, based on calculations and information from other sources.
Caliber: .414 Super Magnum.
Barrel length: 8” (For a longer 18” barrel add ca % = ca Fps to the velocities below.
Powder: Accurate – 5744®.
Reduced loads included with 5744 data
Bullet weight: 170 grains.
Reduced load: 25.0 (ca 1400 Fps)
Start load: 27.0 grains (ca 1500 Fps)
Maximum load: 31.0 grains (ca 1800 Fps).
Bullet weight: 210 -220 grains.
Reduced load: 22.0 (ca 1100 Fps)
Start load: 24.0 grains (ca 1275 Fps)
Maximum load: 27.5grains (ca 1500 Fps).
Powder: Accurate – 4100®.
Bullet weight: 170 grains.
Start load: 27.0 grains (ca 1600 Fps)
Maximum load: 30.0 grains (ca 1900 Fps).
Bullet weight: 210 grains.
Start load: 23.0 grains (ca 1300 Fps)
Maximum load: 26.0 grains (ca 1550 Fps).
Bullet weight: 250 grains.
Start load: 21.0 grains (ca 1325 Fps)
Maximum load: 23.0 grains (ca 1425 Fps) LD ca 84%.
Powder: Accurate – 1680®.
Bullet weight: 170 grains.
Start load: 31.0 grains (ca 1425 Fps)
Maximum load: 34.0 grains (ca 1625 Fps) LD ca 106%
Bullet weight: 210 grains.
Start load: 27.0 grains (ca 1325 Fps)
Maximum load: 31.0 grains (ca 1575 Fps) LD ca 98%.
Bullet weight: 250 grains.
Start load: 25.2 grains (ca 1275 Fps)
Maximum load: 28.0 grains (ca 1450 Fps) LD ca 96%.
NOTES:
It’ important to note that SAFETY is our prime concern therefore we strongly recommend.
1.
ALWAYS BEGIN LOADING AT THE RECOMMENDED MINIMUM “START” LOAD and develop loads in 2% increments towards the MAXIMUM load.
2.
CAUTION: Beware of double charging if the loading density is below 50% of the available volume.
Example: Most Handgun caliber/powder combinations 
