Thanks Bill, that kind of wha I was thinking as well around 100 FPS faster out of the 8” barrel.

8" bbl comparison

300 Blackout
Brown box Hornady "Custom" 110gr V-Max 2142fps average
Black box Hornady "Black" 110gr V-Max 2127fps average

300 HAM'R
WC 110gr Sierra HP 2238fps average
WC 125gr Sierra SPT PH 2204fps average

Basically a 100fps gain out of a 8". However this is with 300 HAM'R ammo loaded with CFEBLK when we can only get to 48k PSI before we run out of powder space, I'll bet loads with H110 or SBR SOCOM would run faster out of the short barrels??? H110 will run the pistol gas 8"-11.3" guns but we just don't load any commercial ammo with it since it won't function our 16" -18" guns with mid-gas. So far the Shooters World SBR SOCOM powder is the fastest powder we're tested that will run all the guns like CFEBLK and A1680 does.

With heavier bullets like the 150gr I think the spread will be larger

hey Bill I just picked up a 14.7 barrel and was wondering what range of powder charge are you using with shooters world SBR Socom powder if you don't mind sharing have you also try A5744

Bill,

On a different subject, talk about a small world......I met a man at the Garland gun range yesterday. He was there with his son. He said you were related to them I believe through marriage but not sure......said his son was there shooting for the first time a custom you built for him as a gift for graduation. Very nice gesture on your part and the personal serial number was cool. Of course the pistol I was drooling over. Well played Bill.

I've only had time to try SOCOM with 110gr bullets (both Hornady and Speer) and 24.8gr is giving me 2640fps from a 18" bbl with sub-1" accuracy, I went up over 2700fps, but accuracy/ES/SD#s suffered. Keep in mind this load has NOT been pressure tested!!! My 125-150gr GO TO loads are still with CFEBLK in all bbl lengths.

I will have access to a SAAMI spec pressure bbl in early July at a company that isn't a powder mfg so I'll get to test loads that I've not been able to due to them being loaded with a competitors powder.

I tried A5744 with little success. At this point I consider CFEBLK, A1680 and SOCOM the only three suitable powders available to the general public, however I'm gradually learning about powders that only the big ammo companies have access to that look very promising. H110/Win296/Vit110/A11FS burn rate powders won't function the action on our mid/intermediate gas length guns and are only suitable for the pistol gas barrels. I even blew a mid-gas gun up trying to get it to function with A11FS.

We just received sample cases from a second supplier and I'm testing now. They have more powder capacity than the Starline mfg cases and so far are testing out well.

So far I have try 125 tnt CFE Black 27.2 and was only avg 2391 fps and 125 sp 27.8 2438 fps all loads with 300 hamr brass CCI 450 velocity was measured with a Magnetospeed velocity seems pretty low I have talked with other guys that are running the 300 hamr and their velocities are in 2550-2630 in 16 inch barrel I don't know if it could be this particular lot of CFE Blk ? That's why I was thinking of running a faster powder to compare I don't know what are your thoughts about it

Finally got the opportunity to break in the 300 Hamr this weekend. very impressed with the performance right out the gate, zeroed an inch low at 50 yards then moved back to the 100 and set up the chronograph to gather some data on the WC Factory loads out of the 18" Bill Wilson Ranch profile barrel I put in my Aero Precision M4E1.

110 grain lehigh controlled chaos: Average velocity of 2682 fps, SOD 6.63, and Extreme spread of 14.85 fps
130 grain Speer Hot-Cor: Average velocity of 2568 fps, SOD 9.11, and Extreme spread of 25.08 fps
135 grain Speer Hot-Cor: Average velocity of 2305 fps, SOD 15.81, and Extreme spread of 33.79 fps

All three groups were just over an inch and all three varieties were within an inch of same point of impact.

First impressions were high from me, I've got the data i need to start rolling my own and I am looking forward to testing the versatility of this round.

Due to my wife having surgery tomorrow and me going to have to be Mr Nurse for awhile I had my last June hunt this am with 4 HAM'R kills.

YTD totals are: sow 125, boar 123, total 248

Three were shot with the .350 Legend and the other 245 with the 300 HAM'R

Praying your wife has a smooth recovery and for patience as you tend to her.

On a personal level I want to thank you for your persistence in developing the .300 Ham'r. I go hog hunting with my father once a year and as he's getting older his .308 and .270 rifles have begun to be too much as he's been more recoil sensitive as of late. He mentioned having read about the .300 Ham'r in a magazine and about the kind of performance it was capable of. I was honestly skeptical. "Not another AR-15 caliber.", I thought. After several hours researching, watching videos by elkbow, and posts from the guys in Team Oink-I was sold. Knowing first hand what a .30 WCF can do to a pig I knew there should be no trouble getting this chambering to perform.

As I already had a build started I ordered the 18" Bill Wilson Ranch profile barrel as it seemed to be the best option between weight and performance. I also ordered dies, brass, a gas block and gas tube, a Lancer 300 Blackout magazine and later on a Q-Comp to top it all off.

I started load development from the website data. Loading up 30 rounds of 130 grain Speer Hot-Cor ranging from 26.5 to 27.8 grains of CFE BLK. I deviated from the OAL listed and went with 2.195" as that put the base of the bullet right at the neck to shoulder junction. After having sighted in and chronographing we achieved 2470 FPS with the 27.8. Recoil was firm but easily manageable. The Q-Comp really kept the muzzle down during recoil. We were able to recover some of the bullets from the shale backstop and found several had beautifully mushroomed.

My goal is to reach the velocity of the factory 130 grain ammo. I've loaded up some at recommended OAL (2.175") and 27.8 grains of powder hoping that seating the bullet further into the case will up pressure and therefore velocity. I also loaded up 28.0 grains of powder at 2.195" to see if that would get me closer to my goal. I'll also be testing a 150 grain Sierra Pro Hunter load. Charge weights will range from 23.8 to 25.0. I'm looking to achieve 2250~. OAL is 2.260"

I also find Hodgdon's load data to be very poor. The one thing that I was happy to see was the use of different powders and might have confirmed a suspicion I had about a slower powder for the heavier 150's. We hunt in the freezing cold or the scalding hot so having a powder with temperature stability(though typically a negligible issue) is reassuring. I'm looking forward to seeing more data with other powder and bullet combinations. I've referred to the JBM Bullet Length List( Here ) to make a list of suitable bullets to test. The 300 Savage variant SST doesn't appear to be on the list but from my research or seems to be 1.12" I'm looking to try bullets with a higher BC to carry velocity and energy further out if I need to take a longer shot. 125 grain SST's and Accubond's, 130 grain Hornady Spire Points and TSX boat tail's, and 135 grain FTX's.

As I develop more data I'll pass along what I've learned. I don't get to go shooting much so it'll be some time before more information is posted. We're also going to try an adjustable gas block to slow down the bolt carrier group. Deer season will be coming up in November and hog hunting for us will be in January so we'll be able to verify terminal performance. I've also started working to build a 20" .300 Ham'r for myself. Take anything I've posted here so far with caution as some of it is over published charge weights.

Anything I can do to keep my dad hunting longer is well worth it for me. There will always be a place for a Ham'r in my safe.

Thank you for the info sir. I'm also glad to hear your wife is doing well.

If I get the time tonight I'll sacrifice a piece of brass and make a gauge to see where the lands are in this rifle. I have noticed all of the data for OAL is less than what most consider max magazine length(2.26"). Was this to optimize a certain weight class of bullet?

...YTD totals are: sow 125, boar 123, total 248...