Subsonic 147gr

[Colohunter]

Hey, I know I have seen subsonic loads for the 147 gr Winchester FMJs on here before, I was just wondering what you guys use. I was thinking of going to either the Winchester or maybe the 150gr Hornady FMJ as a cheap, subsonic plinking bullet. I've got some 220gr SMKs and 125gr Pro Hunter's that I am loading for, but since I got the rifle to shoot subsonics I would like to experiment with the cheaper bullets, possibly for IDPA side matches and such.

[Garrett]

Try here (http://www.quarterbore.net/forums/showthread.php?t=1757) for starters.

[Colohunter]

Thanks Garrett, I didn't go back far enough I guess, I knew that I had seen that. What powders work best with the lighter bullets to cycle subsonic?

[JFettig]

I've shot 165 hornady soft points subsonic with AA#9. Not many of them though.
I have a .120 gas port with an adjustable gas block, its screwed out to the same point I shoot 220 subsonics. I don't remember the exact load.

Jon

[Garrett]

What powders work best with the lighter bullets to cycle subsonic?
I couldn't say. I'm using a single-shot Contender.

Sorry.

[pug]

I bought the bulk Hornady 150gr FMJ and for subsonic loads use 8.3gr H110 with bullet seated to cannelure. There is a note to myself saying it doesn't always lock bolt back so you may have to play with it.

[ranger dave]

that is my pet load 8g of 2400 with a 147g fmj that is all i shoot now :uzi2:

[Colohunter]

Pug: Do you use an adjustable gas block, or just a standard one. I am using a standard right know, but hope to add an adjustable soon.

Thanks everyone for the input, I may also try to use some 150gr Copper Plated bullets I have from Berry's for 30-30. They would be pretty cheap for plinking ammo.

[carcass]

Thanks Garrett, I didn't go back far enough I guess, I knew that I had seen that. What powders work best with the lighter bullets to cycle subsonic?

I have loaded 147s subsonic with H4227 before. The problem is that the peak pressure never gets high enough to expand the case and seal the chamber well, so there's tons of blowback gas and dirt from the chamber. Not real good for the bolt or chamber. When I did that I got good velocities and a very low variance, but dirty as hell and most of the powder didn't burn. I modeled it in QuickLOAD and it predicted about 60% burn or so. I'd believe it based on the unburnt powder.

The 4227 loads cycled the action but would not lock back on last round.

Anyway, a faster powder might be in order if you want to get peak pressures high enough to seal the chamber. I modeled some loads with Titegroup and Clays, but I haven't tried them yet--QuickLOAD still says peak pressures are pretty low.

[Colohunter]

I finally got some Hornady 150 FMJs while Midway was having a sale a little while ago. I've got H110 and some 1680 on hand, I will probably start with th H110 and see where to go from there.

[pug]

Missed the question back awhile ago. My pistol ported 16" barrel would not cycle subsonic 150gr loads originally. In the end, to get it to cycle, that barrel had its gas port opened up to .101~.102" and had the standard gas block on it. I then switched to an adjustable gas tube but after forgetting to turn it down one day and blowing the ejector and ramp off the bolt/carrier I have since switched to a three position gas block.

[Colohunter]

Well, I am finally getting around to loading up some of the Hornady 150gr FMJs today. Tomorrow I will be shooting, so I will hopefully find something that works. I will be using the H110 loads from here, and trying some AA 1680 as well.

[Pitt300]

My 150g Sierras w/8.3g H110 on 66* day clock @ 1066.6 fps & group in 0.648".
Very accurate & cheap & cycle fine but low on the energy scale.

[Colohunter]

Here are some of the results from my trip to the range today, all groups were five round sets of each load:

11.7gr of AA #1680, 220gr Sierra HPBT, 1089fps
All rounds ejected, cycled and the bolt locked back after the last round.

10.5gr of AA #1680, 150gr Hornady FMJ, 1095fps
All rounds ejected and cycled, but the bolt did not lock back after last round.

8.3gr of H110, 150gr Hornady FMJ, 1113fps
All rounds ejected, none were cycled, and the bolt did not lock back.

These were fired from a M1S upper with less than 100 rounds through it, using Pmags. Accuracy is still around 3-4", so that will be the next step to work on.