OK - I think my next build is going to be a 300BLK lightweight pistol. Probably around 8 to 10 inches.
I have been doing research and finding some older data about how some 300BLK barrels are not high enough twist rate?
Who has the best barrels for sub $300 in the light and accurate category?
What is best for gas port / gas tube length / buffer / spring combination recipe?
What is the current bleeding edge 300BLK barrel to shoot supers and subs up to around 440m and have sub 2MOA at 100m?
I have seen one test that had a Brownells barrel go sub MOA with a couple different types of ammunition but I’m uncertain of the exact specs and pretty sure it’s not as lightweight as I’d prefer for this build.
I would be suppressing it but not all the time but perhaps most of the time. Depending upon feedback here.
Some interesting data points I found, do you agree or disagree? Any other thoughts to add to this?
From a 9 inch barrel (2050 fps):
– 100 inches drop at 410 meters
– 41 inches drift at 470 meters
– 291 ft-lbs of energy at 625 meters, so 440 meter max effective range for a 9 inch.
• 300 BLK from a 9 inch barrel has the same energy at the muzzle as a 14.5 inch barrel M4, and about
5% more energy at 440 meters.
I missed the 2 MOA and somehow only saw the part about Brownells sub MOA. Just about any barrel should give you about 2 MOA or better. Ammo selection will be the bigger determinant outside of that. Pick the one that fits your budget and checks the other boxes you want checked.
I would look at the Faxon and/or Ballistic Advantage options. There’s a couple stainless options that would fill your requirements if you don’t think the standard melonited options will.
I am shooting a 9" BCM barrel and can add that’s it’s nominal dry weight is 15 ounces.
As to it’s precision, under 2 MOA is usually the case @ 100 yards. This is very ammunition dependent.
Best shooting ammunition has been handloads with Hornady 110 grain V-max bullets and Winchester 296 powder. Velocity is 2,200 ft/secs from this 9" barrel.
During load development I was able to get this sort of accuracy with match bullets:
Do not know the gas port size, but BCM makes them to shoot the full gamut of 300BLK ammo, from subs to supers. Supposedly the buffer weight is what controls the proper function according to their website. Standard carbine buffer and spring for subs, H3 buffer and carbine spring for supers.
+1 the BA. I have a BA Hanson that’s a fine barrel. But then again they all are.
I think with the 9” barrel you burn most of your powder, but I’m running an 8.3 and @100yd w/ subs I am really very pleased. Not sure if your timeframe but can get some groups next weekend to show you.
I am not in a huge hurry. In research mode right now. It is looking like the BCM 9 inch is what I am looking for as it’s 15oz and reports of sub moa accuracy so checks all the boxes.
I am more concerned about twist than anything else with 300 under 9". On my pdw I went with a custom X-Caliber 7" Barrel with a 1:6 Twist 6 Groove. Its sub moa. The current Q Honey Badger is 1:5.
OK - I posted a bunch of pics of my BCM barrel but those vanished during the M4carbine site outage last week.
Should I post a separate review?
Barrel Weight was 14.9 oz / 262 grams
it arrived with red netting and a black muzzle cap. However, the barrel had numerous dings and snail trails all over it. One small ding on the outside/ end of muzzle.
Almost looked used but from the inside and chamber I could tell it was not.
The M4 feedramps are an “enhanced” version. They are lowered by a couple thous and wider than normal M4 ramps as compared to an FN/Spikes and a Larue barrel I have.
I installed a Master Of Arms Titanium adjustable gas block which by the way are amazingly beautifully machined and only 18 grams
adjustment is a bit of a pain on this as it does not have any clicks and relies on a set screw
never having shot 300blkout before, but familiar with 30-06 I was prepared for a bit more kick. It was not bad but considerably more than my 11.5 / 556 with Ti/AL bcg/AR10 spring
I was using 123gr supers by S/B. With A2 muzzle device. No discernible flash and not much more boom than my 11.5 - maybe less?
Sighted in with my Leupold 1-6 MultiGun CMR green dot which was almost the same size as the complete upper. Hilarious.
Next I’ll shoot for groups and tune this for a 5.9 oz aluminum bcg and see if I can’t get the recoil impulse down while still being able to cycle subs and supers. That could be challenging…
If anyone has a line on subsonics that group well and cost less than .50 / round LMK
I should have my dies by end of next week but don’t have any projectiles other than some 150gr Hornady softpoints
