I've tried a few different loads based on 147 gr FMJBT and 155 gr BTHP and I've good accuracy. My brass is mixed head stamp, resized .223 brass and all primers have been cci 450 but will use some wolf too.

 

147 FMJBT Nosler

17, 17.2 and 17.4 grains of H110

COL 2.220"

All three shot well (accurate) with no signs of pressure at all. Ill probably stick with the 17.2 gr h110.

 

155 gr HPBT Nosler

17 grains of H110

COL 2.220"

Shot very nicely with a crisp snap. This load is 1.1 grain above the hornady manual for max load. I had no signs of pressure or extractor marks on brass. I assume hornady is conservative on their charts but will back it down to 16 grains.

 

I fired all of these at a 50 yard range at Woodland Park.

 

Today I'm going to try and make subsonic and supersonic rounds. I don't have any Lil gun but will try it with h110. I have 245 gr RNFP Missouri bullets. From what I've read follow 225 SMK loads as a start for the cast lbullets.

 

I am going to try 8.4 or 8.5 grains of H110 at 2.09-2.12 COL for a try at subsonic and for supersonic I've seen recipes that run from 9.8-11.6 gr H110 with a COL 2.12".

 

Since there isn't much data out there I thought I'd start this thread for all of us 300 lovers to collaborate. Yes one day with my 300 and I love it. I may even sell my grendel.

 

Thanks to Bill for sending me some load data via email.

 

I have bullets in 30 caliber in the following: 110 grain round nose plated, 150 grain FMJBT Hornady, 155 grain BTHP Nosler, 168 grain FMJBT Nosler, 245 grain RNFP lead Missouri Bullets.

You welcome. I have been doing some research as well, looking for heads that have a higher BC (read pointy) and expand better in the 1,000 to 2,000 FPS muzzle velocity range for hogging.  Most require speeds way above 300BLK capability.  Let you know if I find something.  Lehigh Defense, but they're never in stock.  Using H110 and AA1680 right now with M80 147s and SMK 175s. Don't have specifics with me right now, I'll try to remember to get later.  Using IVI brass from the 80's I converted.  Just starting to document case volumes on different brass, could be a factor with certain powders.

 

I go to Easton often for family matters, hitting up T&T Reloading for supplies as well.  Shoot me a PM if you have something on your list if your interested.

I really appreciate it and if you get over there and see some Lil' Gun or 1680 I'd gladly buy some.

 

I also hope to take this rifle hog hunting when I get it where I want it.  So far for target shooting it's fantastic.  Hopefully we'll get some folks in this thread contributing or at least learning.

 

Cheers,
Rob

Loaded up a bunch of Hornady 150 gr FMJBT with 16.4 gr H110, CCI450. Very nice and super accurate. COL was 2.12. Since I have 2500 of these bullets this is my new go to plinking load.

 

I have some Lil Gun on the way so I'll mess with some subsonic loads using my Missouri bullets lead, FP, 245 gr. I'm hoping with the whisper spring I can get some good subsonics.

LC 04 cases converted to 300 AAC Blackout

CCI #400 primers

17.2 gn of LilGun

125 gn Sierra OTMK

2.5" COAL using Hornady .30 Bullet comparator 

 

7 shot group @ 100 yards off bench using 3 power red dot (The bottom round to the right was me)

 

Wow that's terrific.

Got my hands on 4 lbs of lil gun so let the super heavy loads begin.  I'm going to mess around with the 245 grain lead for Missouri bullets.  I'd love to get a low super or sub sonic round out of those.  I know I can't have a suppressor so I won't be able to go as low as I possibly could because of the gas release but I have an adjust able block that I may force more down on the bolt.  

 

I'll get back with the loads and results soon.