Does anyone have any reduced loads with jacketed projectiles in the .416 Rigby.

Can Trail Boss be used. If so how ?

ACCURATE powder data: XMP (or XMR) 5744 with RCBS 350 FN to 55 grains / Fed 215 primer.

I use 350-grain SPEERs and 50 grains XMR-5744. This is a smokeless powder designed to be used with larger calibers including former black powder offerings like the Sharps (Quigley Down Under).

Trail Boss can be used.. its only parameters is that it not be compressed.. beyond that, you can't get enough into a case to cause pressure problems.. it is intended as a low pressure load..

for accuracy, myself I'd reach for SR 4759...

Lyman's Cast Bullet manual lists 28 grains of Unique for the 460 Weatherby with a 500 grain bullet for an MV of 1360 fps...so you can extrapolate from that number potentially...

starting loads on the 460 with that powder was 20 grains.. that load data should be conservative pressure wise..

Hope this helps you Code4, it outlines the process for developing a load for any cartridge as well as providing some data for common cartridges. This is from the IMR site and so is "manufacturer" data:


http://www.imrpowder.com/PDF/Trail-Boss-data.pdf

Well in looking for a sub load for my .416 Rigby and cast 350 grain Flat Nose Boolits, I found some loads listed by Hodgdon for Trail Boss (TB).

Start: 25 grains for 1,139 fps
Max: 35 grains for 1,354 fps

I sent an email to ADI who confirmed this is the technique for useing TB.

http://www.hodgdon.com/PDF/Trail-Boss-data.pdf

I managed to score a container of TB from my local gun shop. I weighed a clean empty .416 Rigby case with an old primer in-situ. Weight was 360.80 grains. I then filled the case with TB to the approx. base of the neck. The case holds 35.6 grains of TB. 70% of that is 24.92 grains. Almost exactly the start load on the Hodgdon site.

Old news for some, but sub loads for Big Bores are doable with ADI Trail Boss.

I loaded up one round with 30 grains of Trail Boss under a 400 grain Hornady RNSP Interlock and fired it off this arvo.

Recoil was equivalent to a .243.
Noise was a bit of a dissapointment, more like a Pop from a sideshow alley air rifle.
POI unknown.
Primer very rounded with no pressure signs.
Case was approx 85% full.

Full load development tomorrow, weather permitting.

FWIW. 50x .416 Hornady 400 grain RNSP's cost the same as 50x .416 Woodleigh 450 RNSP's $62 per 50.

I worked up a TB load for my .450-400 NE 3" using 210 grain pistol bullets. It's a lot of fun to shoot, and super cheap to shoot too.

I tried TB in .300 H&H yesterday, and it was a hoot to shoot. I did get chided for working up the load without a chronograph, which made me chuckle.

http://forums.accuratereloadin...3221043/m/1081084041