125 grain serria match king 300 blackout

[WilliamSS2025]

oh okay a guy on Facebook said the max load he found was 18.3 so i didn't want to blow anything up lol but let me know how that goes tomorrow for sure.

[jc10311]

I used a load that I got from "a guy on Facebook" one time and damn near blew up my gun. I learned the hard way to work up slowly to maximum loads. I don't use Facebook myself, so you can trust my loads.

A couple of tenths of H110 can make a BIG difference in pressure.

[WilliamSS2025]

lol i never said i was going to use it lol let me know how that goes tomorrow... i'm still cleaning my primer pockets before i put in my primers and i'll probably make a few loads tomorrow night or monday.. got to get my other load finished up too can't seem to make my hornady 110 grain soft points group good... to many projects at once lol

[MarkInTexas]

I tested some 110's with IMR4227 last week. All 5-round groups. Best groups were with 18.5g...consistently under 1" at 50 yards with one group you could completely cover all 5 rounds with a quarter.
A close 2nd was with 18g.

COL on both was 1.992"

[jc10311]

I got a chance to go play today. I tried the SMK loads at the end of the day and was tired and HOT! The gun had about 100 rounds through it when I shot this group and was also pretty HOT. Even so, it didn't do too badly. 1.658" - .308" = 1.35" or just about 1.3 MOA at 100 yards. The first two shots were touching and I got cocky.

[WilliamSS2025]

what was your load on them? 2.250 col @ what powder charge of H110? you still useing the 3x magnification?

glad to know i'm not the only one who gets cocky when the first two touch haha

[jc10311]

what was your load on them? 2.250 col @ what powder charge of H110? you still useing the 3x magnification?

glad to know i'm not the only one who gets cocky when the first two touch haha

17.5 gr H110; 2.250" COL (just fits in the mag); Scope was Primary Arms 4-14X44 FFP set at 10X. Temp was 94 degrees with light and variable winds. Humidity somewhere around OMG! Shots were from a sandbag at the front and only shoulder support at the stock -- sitting. Gun has a CMMG 16" WASP barrel with a carbine gas system. Trigger is a JP Enterprises JPFC-1 set at 4.25#. Shooter is old, fat, and half-blind. When I was younger, could see, and in shape, I was a sharpshooter for a CA Sheriff's department, so I know what I'm SUPPOSED to do.

[WilliamSS2025]

haha i know how you feel about the being blind and humidity in the omg levels
i suppose i'll make me a few at 17, 17.2 and 17.5 and see if what my gun likes..
did you make a full 30 round mag or just a few?

[jc10311]

haha i know how you feel about the being blind and humidity in the omg levels
i suppose i'll make me a few at 17, 17.2 and 17.5 and see if what my gun likes..
did you make a full 30 round mag or just a few?

I only made up 20 because I didn't want to have to pull a bunch if it didn't work well. Now I'm comfortable with this load, but I'll probably back off the COL to 2.20" just to get a little more clearance in the magazine. I had no feeding problems at all.

[michaelprob]

I loaded up some with H110 at a COL of 2.125 (kinda short, but shot and cycled fine).

Chrony: Shooting Chrony Beta Master; 10' from muzzle.

Gun: 16" CMMG WASP; carbine gas; Primary Arms 4-14X44 FFP

All brass was mixed head stamp, but mostly LC.

Shooting was done at 100 yards using a bipod and no rear bag.

17.0 gr; Wolf primer; very light crimp
Velocities for four shots: 2069, 2035, 2131, 2168. [One shot registered an error]
Average: 2101
ESP: 133
StDev: 59.9
Group size: 1.18"

17.2 gr; Rem 7 1/2; very light crimp
Velocities: 2050, 2118, 2127, 2134, 2140.
Avergae: 2114
ESP: 90.31
StDev: 36.59
Group size: 1.22"

17.5 gr; Wolf; very light crimp
Velocities: 2114, 2191,2139,2119, 2137.
Average: 2137
ESP: 77
StDev: 31.85
Group size: .96"

I saw no pressure signs at 17.5, so you could probably go a little higher, but I won't. I believe that the Hodgdon manual lists 17.8 grains as the max, but I may be wrong.

I've loaded 20 with 17.5 gr H110 and a COL of 2.25" [SAAMI spec max is 2.26"] to see how accuracy is affected. Hopefully, I'll get a chance to shoot them tomorrow (Saturday).

if i load @2.210 ( read that was AAC recommendation) do you think 17.8 would still be the max? i'm new to loading... and when you say light crimp what do you mean.. i got the lee factory crimp die but i'm not really sure how how much that thing really does...

I'm not a reloading expert, but I don't think that changing the COL from 2.125 to 2.210 or 2.250 makes much difference in the maximum load. I've had some really bad experiences I use RCBS dies, so the bullet seating and crimping are done in one step. I set the die by backing out the bullet seating rod and putting a cartridge in the press. I run the ram all the way up then turn the die down until I feel it hit the cartridge. I Back out the ram and then give the die 1/2 more turn. With one full turn past just touching, I can see a light roll crimp and that's what I'm trying to avoid.

I didn't get a chance to try my 2.250 loads today. Just as I was getting stuff together a thunderstorm rolled in. Maybe tomorrow.

I use the Lee Factory Crimp die and it works very well. Did not think a roll crimp would be effective with jacketed bullets.