Superformance, 165 TTSX, 300 WSM starting point ???

[Bachekermooni]

I posted earlier in a different area here. I could not find any data for the above.
So I took a SWAG approach. I am comparing Max Loads for same powders for a 165 gr Nos Part from the Hodgdon Reloading site to the Barnes 165 TTSX reloading site.
IMR 8208 XBR - Hodgdon - 54.4 --- Barnes - 56.3
H4350 - Hodgdon - 65.5 --- Barnes - 69.4c
Win 760 - Hodgdon - 65.0 --- Barnes - 68.4c
Superformance - Hodgdon - 72.0 --- Barnes ???

Superformance Min Load from Hodgdon for the 165 Nos Part is 65.0. So where do I start with Superformance for 165 TTSX?
Barnes recommends COAL of 2.860". The average COAL at the lands in my Kimber 8400 is 2.936". I wanted to start 60 thou off lands. Mag max length is 3.03".

Brass is once-fired (same rifle), and fully prepped Norma brass with shoulder set back 3 thou and neck tension at 2 thou.

Much appreciate your feedback.

 

[Coyotefurharvester]

Usually the load data is much different for lead core vs lead free bullets. May want to think about Hodgdon data for the GMX bullet. Definitely helps to have a chronograph to generate your own data.

 

[6.5PRC123]

I tried reloading my 300 WSM with Superformance and Barnes bullets quite a few years ago and found that the amount of carbon that it produced in the barrel was not something I wanted to deal with so I stopped using it. I found that 64.5 grains of H4350 20 thousands off the lands with 168 ttsx worked best for me in a bench mark barrel. Start low and work up. 3143 fps.

 

[RegionRat]

Usually the load data is much different for lead core vs lead free bullets. May want to think about Hodgdon data for the GMX bullet. Definitely helps to have a chronograph to generate your own data.

My first thoughts were the same... to try and take a look at the Hornady data since they have the GMX bullet, and also sell loaded ammo in the GMX 165 300 Win Mag in their Superformance line.

I have the Kindle version at hand, but unfortunately they don't list the Superformance powder under that bullet for the 300 Win.

Since they offer the ammo and the powder for a similar copper monolithic bullet, maybe they would answer a reloading question under supporting the powder? Their Superformance data for their 165 GMX would be good perspective to compare with anything else.