Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Site Notices
10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/16/2005 10:11:39 AM EDT
I'm reloading for my M4 and I've been playing about with 55gn and 69gn heads. I'm fed up with having to adjust the dies, so I'm after opinions on a single bullet/powder combination that would be suitable for 0-600yds (within the constraints of the iron-sighted M4). Principle use for the rifle/ammo wil be PR/SR especially if airsoft is banned.

The M4 is from scope-eye so its more than likely got a fast twist barrel.
I'm after feeding the rounds from the magazine, not single loading.

Any suggestions? anybody?
Thanks.
Link Posted: 8/16/2005 10:29:39 AM EDT
[Last Edit: 8/16/2005 10:47:50 AM EDT by clayo]
I dont have any answers for you but i will be keeping an eye on this thread, as i have just bought some of my reloading gear, i figured, if i'm paying this much for a rifle i shouldnt put shite ammo through it.

Steve
Link Posted: 8/16/2005 10:50:26 AM EDT
[Last Edit: 8/16/2005 11:41:26 AM EDT by streetfighter]
Have to say 69's. Ok, they're not as cutting edge as 77's but should suffice for what you want.
If the barrel is an 8" or faster twist, I'd be tempted to try 77's. They'll be slower than the 69's, but not by much, but their higher BC should help them to fly better.
As for 55's and 62's, well they're not match grade bullets so I wouldn't bother. I have had reasonable results with 62gn RG from my carbine, but they're only really good for ETR. Definately lacking at longer range.

OK, just did some calculations with Sierra Infinity
From 200yd Zero

Example velocities
Sierra 69 Sierra 77
Velocity 2600 2500
600yds 1249 1299
Bullet path 117.17" 115.26"
Wind drift 56.89" 50.13"

So as you can see, the velocities are just examples, but even though the 69 is 100fps faster at the muzzle, the 77 is 50fps faster at 600yds.
Also, the 77 drops less and has 1MOA better wind drift in a 10mph wind.
At these speeds, they're both still supersonic at 600yds, but looking at these figures, I'll reappraise what I said above regarding the 69's and suggest the 77's. If your barrel doesn't spin the 77's sufficiently, then I might suggest Hornady's 75gn HPBT. This has a slightly better BC than the Sierra 77 apparently, but can still work in a 9" twist. And they're cheaper. I have found 77's to be a more accurate bullet though.

Hope this helps

Mark
Link Posted: 8/16/2005 11:17:26 AM EDT
thanks Mr. Streetfighter
Link Posted: 8/17/2005 1:24:58 AM EDT

Originally Posted By limey1:
thanks Mr. Streetfighter




MR Streetfighter?

Do you owe him money or something?
Link Posted: 8/17/2005 1:29:42 AM EDT
Streetfighter,

Can you find anywhere in Sierra Infinity where to Specify Barrel length so it then works out your muzzle velocity?

The reloading section is good but it's based on a 20" barrel, not an awful lot of good if you want a semi accurate reference chart for plotting drops when using a 14.5" M4 barrel.


Dave
Link Posted: 8/17/2005 1:36:25 AM EDT

Originally Posted By elucidate:
Streetfighter,

Can you find anywhere in Sierra Infinity where to Specify Barrel length so it then works out your muzzle velocity?

The reloading section is good but it's based on a 20" barrel, not an awful lot of good if you want a semi accurate reference chart for plotting drops when using a 14.5" M4 barrel.


Dave



Infinity doesn't do that.
You want PC Bullet, or even better....Quickload

Mark
Link Posted: 8/17/2005 3:11:50 AM EDT
52gr SMK have been my most accurate round so far but I'm sure they would not be great over longer distances.
69grSMK worked fine but i've not tried enough of them for comparison
68gr Hornaday was crap in my short rifle and keyholed but shot very well in the longer rifle

Today I visited the last Dealer near me and again could not get any bullets so I'm gonna try da web next...I was told Henry Crank may have stock at a reasonable prices

Bulletless(exept for my fall back military type heads)
Taffy
Link Posted: 8/17/2005 6:05:17 AM EDT

Originally Posted By elucidate:
Streetfighter,

Can you find anywhere in Sierra Infinity where to Specify Barrel length so it then works out your muzzle velocity?

The reloading section is good but it's based on a 20" barrel, not an awful lot of good if you want a semi accurate reference chart for plotting drops when using a 14.5" M4 barrel.


Dave



Very few programs will give you the MV. This is one of the easiest thing to measure and the hardest to calculate. MV will depend upon the powder (type and amount), bore domensions, case internal dimensions, chamber dimensions and a whole host of other things. If you want to know the MV of a particular round in a particular gun, measure it.

Matt
Link Posted: 8/18/2005 10:23:14 AM EDT

Originally Posted By limey1:
I'm reloading for my M4 and I've been playing about with 55gn and 69gn heads. I'm fed up with having to adjust the dies, so I'm after opinions on a single bullet/powder combination that would be suitable for 0-600yds (within the constraints of the iron-sighted M4). Principle use for the rifle/ammo wil be PR/SR especially if airsoft is banned.

The M4 is from scope-eye so its more than likely got a fast twist barrel.
I'm after feeding the rounds from the magazine, not single loading.

Any suggestions? anybody?
Thanks.



I shoot Sierra Matchking 69grains, with 20.8 grains of H4198

Out of my 20" 1 in 8 twist Speedmaster I get an average of 2650 fps

Off the Bipod at 600 you can hit the middle of a Bisley with nearly every shot (Wind permitting)

However I am very tempted to try Mr Streetfighters tip of trying 77's

A mate that I shoot with is getting tighter groups with the same rifle and barrell config

77's seem like a better option

Stu

Link Posted: 8/19/2005 8:26:56 AM EDT
After all this I think I'll use 69SMK, for a number of reasons:
1/ I know my rilfe likes these
2/ I've got about 1500 of them in my reloading shed empoirum
3/ Given that I use irons, 1 inch more drop and 1 MOA more wind at 600yds are beyond my resolution at that distance.

PeP, 20.8 gns seems a bit light - I'm running 25 grains of Varget with a 69SMK. Haven't chrono'd it yet though.
Link Posted: 8/19/2005 2:08:04 PM EDT

Originally Posted By limey1:
After all this I think I'll use 69SMK, for a number of reasons:
1/ I know my rilfe likes these
2/ I've got about 1500 of them in my reloading shed empoirum
3/ Given that I use irons, 1 inch more drop and 1 MOA more wind at 600yds are beyond my resolution at that distance.

PeP, 20.8 gns seems a bit light - I'm running 25 grains of Varget with a 69SMK. Haven't chrono'd it yet though.




20.8 works fine for me (Hodgson H4198)

Ran a 50 shot string lowest was 2634 highest was 2682
Link Posted: 8/19/2005 6:15:49 PM EDT
Sierra 77's or Hornady 75's would be my first choice. The 68/69's are really susceptible to wind drift after 300-400 yards. The 75/77 usually stabilize in a 1/9 so you should be golden. For powder Iusually find a good load with Reloader 15, 4198, or Vihtavouri n135/140/540. Some prefer varget, but I have more luck with other powders.

HTH......SRM
Top Top