Just picked up a Ruger RAR 300 and need some loads.....

[viking499]

Picked up a 300 Blackout last night and got my scope mounted today.

Now, I need some recommendations on subsonic loads for it to shoot suppressed.

Anyone have any good recipes?

 

[SCC]

I have two loads that I'm somewhat fond of.

175gr SMK or NCC, CCI MSRP, 5.5gr HP-38, 2.1", no crimp
225gr Hornady, CCI MSRP, 8.7gr H110, 2.15", no crimp

Both of these run at right around 1000fps out of my RARR. The 175 is quieter, the 225 more accurate at 200y. Only a few clicks on the scope difference between them. The 175 is less expensive since I got a deal on the projectiles. Note the use of a fast pistol powder on the 175. SD on both loads is between 10 and 20.

 

[viking499]

Thanks, SCC. Why do you prefer the MSRP over the SRP?

 

[SCC]

I standardized on CCI primers, both pistol and rifle. CCI primers are harder than most. None of my pistols mind. The load data for H110 specifies magnum primers, thus magnums for rifle. I also feel that the more energetic magnum primer is more likely to produce consistent powder ignition with low case fill loads. In addition to the RARR, I have a 300BLK AR and if I recall correctly the magnums are slightly harder than then the standard CCI rifle primer. This should further reduce the probability of a slam fire. I use the MSRPs for both .223 (H335) and BLK (H110, HP-38, A1680, and Shooters World Blackout).

 

[ArchAngelCD]

If you're concerned with slamfires why not just use the CCI#41 primers?

Magnum primers don't always give the best results. Sometimes with some powders the ES and SD numbers will go up when using a magnum primer.

 

[Mr.Revolverguy]

A ton of information here http://www.dayattherange.com/ even a dedicated load page. Many articles on the 300blkout

 

[SCC]

ArchAngelICD, completely agree with what you said. I simply don't want to keep track of and stock more than 2 primer types. My ES/SD #s have been good enough for 200yrds, so I'm satisfied. The rounds and rifle are more accurate than me, so there's not much improvement to be made by optimizing. I'm not really all that concerned about slamfires, but if the MSRP is a bit harder than the SRP that's a plus. 41's are significantly more expensive and that's a minus.

 

[viking499]

What good, inexpensive bullets are you using that will not cause leading issues?