147gr fmj good for 300 Blackout

[eajonesyk2]

Hi are these 147gr bullets likely to work well for super 300 blackout loads? I know Wideners has similar bullets cheaper before shipping is added but for me it works out about the same once shipping is calculated in. If anybody is aware of a better valued fmj option please share. This will be for plinking in and around a 100 meters with 16in AR pistol length gas sys. Thanks in advance.

http://rmrbullets.com/shop/bullets-...-62mm-8/308-147-gr-fmj-boat-tail-bullets-new/

 

[Reefinmike]

I shoot a lot of 147 and 150gr cheap bulk bullets out of my 300. they may not be the ideal weight, but they work just fine for plinking at the range. Good success with w296, h110 and lilgun.

 

[ny32182]

I've shot 150gr Hornady FMJ with about 16.5gr H110. Everything worked fine; I'm sure the bullets above would be very similar. Just got to make sure your OAL is right for feeding in your magazine.

 

[Walkalong]

They work just fine. These were some I pulled from corroded .308 Surplus. I bought 500 150 Gr FMJ "blems" from Midway that shot better. Appeared to be Hornady.

If you can find some cheap pulled 150s they will work well for plinking.

 

[rg1]

My main plinking load is using 147 FMJ's in a 16" carbine 300 Blackout. I load H110 at 16.5 grains and get about 1950-1970 fps and decent 100 yard accuracy. The Widener General Dynamic 147's are very nice and the RMR 147's are too. Prices of 147 FMJ's has gone up in the past couple years or so. Used to be a flooded market of surplus pulled bullets but now surplus is hard to find and only newly manufactured bullets seem to be available.

 

[DownEaster]

Walkalong, what is the device that the lefthand bullet is sitting on?

 

[Walkalong]

Home made powder drop "funnel" or bushing for my part Projector/part home made powder system on my LNL. I have replaced that one with a stainless steel one that is shorter as well. It was just a good height to show the bullet next to a seated one.

 

[Mr.Revolverguy]

150 with IMR4227 makes a great pairing.

 

[dh1633pm]

I also use H110 at 16.5 grains with a 150 grain bullet. Purchased 4k Hornady 150 grainers last winter. Should last me a bit. Don't have an 300 BLK AR. I use a Model 7 AAC Blackout.

 

[eajonesyk2]

Thanks all. I went ahead and ordered 1000 of the 147gr's from RMR. I picked up 1lb each of H110, 4227 and 1680 from my local cablea's so I should be set for awhile. I think I'll give the 16.5grains of H110 a try first.

 

[eajonesyk2]

oal for 147gr RMR bullets 16.5grs H110 in 300 aac

I am going to load a few of the 147gr fmjs I rcvd from RMR with 16.5grs of H110. Does an OAL of 2.14 sound ok? I don't have a comparator so i can't measure from ogive. The batch of bullets I measured so far are all over the map from 1.110 to 1.150. I separated a group of 40 bullets that range from 1.132 to 1.138 so i will use those for my first loads. I will be using gen2 pmags in rifle. Thanks

 

[ny32182]

The random list of OALs I downloaded off the internet a while back says 2.16" for "military pull down" 147gr.

The key is that you want the ogive of the bullet to be at or just behind the rib in the magazine without the rib pushing the loaded cartridge sideways.

Also it probably wouldn't hurt to start a little below 16.5gr. My starting load was 15.7gr.

 

[eajonesyk2]

This is 2.16 COAL, how does this look? see attachment. Thanks

 

[ny32182]

Looks good to me. Shoot a few and see how it goes...

 

[ny32182]

Also, I would case gauge every round, especially if you are using chopped down brass. I'm not an expert, but I have a gunsmith buddy who sees a lot of these and have seen them blown up by using cut down 5.56 brass that wasn't sized correctly and allowed out of battery ignition.

 

[eajonesyk2]

i decided to go with 16gr of h110 since I am using wolf sr magnum primers. Best i can tell from my crude measuring, is with the bullet seated at the edge of the cannelure (2.16 coal with first bullet) the base of the bullet will be sitting about a 1/16th of an inch off the top of the powder charge (16grs worth). Hopefully these fully cycle my rifle (pistol length gas sys) and shoot tight. If not I will load another batch a little hotter.

 

[ny32182]

I don't think you should have any cycling problems at 16gr... if you do, I'd be looking at the gun.

 

[eajonesyk2]

That's something else I don't have, a case gauge. I bought the brass from everglades ammo and it is cut down brass. I checked the length of brass after full length sizing it and the longest was 1.361 most were around 1.356 to 1.359.

 

[Walkalong]

I have loaded them to the cannelure, crimped into it, and they have all fed fine. I have done this with pull downs and new (Blems) bullets. All worked fine. I like the extra safety factor of the crimp into the cannelure to help keep the bullet from possibly setting back. I'm not setting up a target round, just a safe, reliable, reasonably accurate plinker round.

2.000 OAL with the Argentine pull down bullets pictured above, and 2.057 with the blems. Look like Hornady

 

[eajonesyk2]

well there done now. I did not crimp them but they feel tight in there. i will watch for setback towards the middle and end of my first mag. I'm heading to range tomorrow and I will report back. I may load in to cannelure on next batch and use the FCD that came with my lee kit. This will be my first time out with 300 blackout upper from CBC Industries, Keeping my fingers crossed. I'm going to pick up a box of some factory supers to compare function of the reloads. Thanks for the help everyone.

 

[ny32182]

The hornady 150gr FMJ I loaded come up just short of the cannelure as well.

As long as you are sized correctly I think you should be fine.

Personally I'd wait on a case gauge... but ymmv.

 

[Paddy]

My 300bo loading got a lot better when i took the advice on coal of measuring the boolit diameter and marking the boolit at the point where it measures .250". Then seat them so that mark rides right on the magazine bump. Otherwise weird things can happen inside the mags.