300BLK Sub-Sonic Loads 190 SMK

[shoot4fun]

OK. I want to load some for my 10.2" Noveske upper. I can find load data easy enough but not heavy bullets. I'd really like to use the 208 AMAX but they are a unicorn. I have 190SMK so please let me know your subsonic loads for that bullet if you have it. My powders include LilGun and 1680.

 

[rjacobs]

1680 will be the ticket. I doubt lilgun would cycle reliably.

I would start around 11 and work down. I'm just basing that on my 208 amax load of 10.7. In theory you should need a little less powder for the lighter bullet but there are many factors in play. I would simply load 3 of each in .1g increments or maybe .2 and simply function check and Chrono them.

Can't help you on seating depth but I would mark .250 on the ogive and seat it to the magazine rib. That would give your a starting point.

 

[shoot4fun]

Anyone else know how I can make the 190 work in subsonic?
Ideas? Experiences?

 

[SABuzzard]

1680 will be the ticket. I doubt lilgun would cycle reliably.

I would start around 11 and work down. I'm just basing that on my 208 amax load of 10.7. In theory you should need a little less powder for the lighter bullet but there are many factors in play. I would simply load 3 of each in .1g increments or maybe .2 and simply function check and Chrono them.

Can't help you on seating depth but I would mark .250 on the ogive and seat it to the magazine rib. That would give your a starting point.

This is spot on. Great advice.

I'm running 10.6 grains A1680 with 208 amax's in my Noveske 10.2 barrel. I'd do just like rjacobs said. Start at 11 and work down.

It'll be quick and easy to find your load.

 

[shoot4fun]

Thanks to all. I'll give it a go hopefully next week.

 

[shoot4fun]

UPDATE
I loaded 25 pcs of my once fired Hornady brass with some 208 Amax I was lucky enough to find at the gun show last weekend. I put them over 10.8 grains AA1680.
They shot very well today in my rifle, at the least matching the quietness and accuracy of the Hornady factory cub load.