300 SAUM loads for 1000 yard benchrest needed.

[SHall]

I picked up a 1.450 Krieger with 1-11 twist with a Vias muzzle brake in a 300 SAUM recently. It had FL bushing dies from Redding and Wilson seater. It is still in great shape, looks like 2-300 rounds down the tube to me. You see loads for the 300 WSM everywhere here on Accurate Shooter, but hardly any for the SAUM. I will be shooting bullets in the 200-210g range for 1000 yard benchrest only. It will go on my 50 pound HG with a BAT L action, no barrel block. I mainly need to know the best powder. I know a lot of shooters shoot H4350 in the WSM. But I would like to hear from someone with actual hards on experience. Thank you, Samuel Hall

 

[Steveb]

I have shot the 300 SAUM for years in F-Class using the Matrix and Berger 210 VLD's using H4350 and BR2's. Try 58.0 H4350 and jamming .010". Got me into the F-Class World's in 2013!
I had the throat lengthened to seat the bullets out.
All the usual caveats for loading .

 

[SHall]

Steve, that is some info. like I was looking for. What kind of velocity were you getting with your SAUM with the 210's? And is 58.0 a starting load or a match load? Samuel

 

[Steveb]

I used to tune the rifle to 2780 fps. I would vary the load up and down a little to reach the velocity. In reality though, the load really never changed in 6 barrels. This was a match load but in the low pressure node for the bullet. I found it to be consistent in all temperature ranges. We shoot here in winter and summer and temps range from -24 (which is rough to shoot in) to over 100 degree. I never changed the load. However, I did notice that the ES were worse in the cold than in the heat and the loads seemed to get better in the higher temps.

 

[SHall]

Steve, just wondering why you went with the 300 SAUM when all the masses have gone with the WSM? Samuel

 

[Steveb]

When I built the first one I already owned a hunting rifle in the caliber, dies, brass and my gunsmith had a match reamer and made 30 cal barrels himself. I didn't do any magical analysis about the cartridge. In addition I liked the way the Saum looked over the Wsm.
It was just a convenient thing the way it all came together and when it worked out so well I stayed with it.