Cmp rifle load data

[JimPGov]

Guys a little help please.

I'm going to start cmp rifle shooting.

I have .223 rock river nm rifle. I have lc once fired brass, federal small rifle match primers, varget powder, hornady 75gr hpbt match bullets.

I'm looking for powder weight and velocity achieved with that weight.
I'm just trying to shorten the learning curve.

Tia jim p

 

[greyling22]

there should be load data on the can of varget if nowhere else, but I'll throw you a bone and tell you my lee load manual says for a 75grn bullet, 22.5 grains of varget gives you 2582fps. never exceed 25.0grns at 2907 fps.

also check out hogdon, alliant, lee etc. for load data. also, try and learn the twist rate of your rifle barrel. it may not stabilize a 75 grn bullet very well. most 223's are designed for 50-60 grn bullets.

and finally, .223 and 5.56x54 are not identical. there are many threads on the differences, but in my experience, 5.56 has less case capacity.

 

[JimPGov]

greyling22 THANKS , BUT MY DCM GUN HAS THE RIFLING FOR THE 75 HPBT BULLET.
I HAVE ALL THE ITEMS LISTED IN QUANITY AND ARE TRYING TO GET 2750FPS.
I HAVE SHOT THE FACTORY HORNADY 75GR MATCH AMMO OUT OF MY GUN AND IT SHOT FANTASTIC. I'M JUST TRYING TO DUPLICATE THE VELOCITY. THANKS JIM P

 

[hub]

Hey Jim I just got the same upper with 1:8 twist and was going to load up some of the exact same rounds except with Remington BR primers . Midway didn't have them in stock so I went with the Sierra 77 matchking's instead. Anyway I do have some info for the 75's from Hornady. Needless to say as a disclaimer I wouldn't trust my life with reloading charges from some stranger off the Internet and would definitely recommend adding the Hornady seventh edition to your loading manuals.

75gr. BTHP
B.C. .395
C.O.L. 2.250

Varget
19.4 gr. 2200fps
20.4 gr. 2300fps
21.5 gr. 2400fps
22.5 gr. 2500fps
23.5 gr. 2600fps MAX LOAD with VARGET

The Hornady manual shows no load for 75gr bullets that exceed 2700fps. The four powders that are rated at 2700fps are h4895, RL-15, Win 748, and BL-C2. That is the MAX load shown in all four powders.

 

[Sunray]

"...trying to shorten the learning curve..." There are no short cuts. You must work up the load for your rifle. No two, not even two, identical, consecutively numbered rifles will shoot the same ammo the same way.
After all that, Hodgdon gives 22.5(2693 fps) to 25.0(2907 fps) of Varget for a 75 grain bullet. Who made it doesn't matter. Velocity isn't as important as accuracy.
Rock River NM rifles come with 1 in 8 rifling. Your 75 grain bullets will be fine.
"...HAVE ALL THE ITEMS LISTED IN QUANTITY..." Shut off your caps lock and never buy components except for primers, in bulk, until you have worked you the load.
Do this.
Beginning with the starting load given in your manual, load 5 rounds only. Go up by half a grain of powder, loading 5 of each keeping them separate until you get to the max load in your manual.
Then go shooting. Shoot at 100 yards, for group only, slowly and deliberately off a bench.
Change targets between strings of 5 and allow time for the barrel to cool.
When you find the best group, sight in.

 

[ForneyRider]

Lyman manual has load data for 75gr BTHP as well. I get a good price locally on the 75gr BTHP so I shoot them a lot.

I went up to 24.5gr of Varget with 2.28in COL for the Hornady bullet. I got a light scratch on the 75gr bullet in my DPMS Panther bull 20 at 2.28in COL. I got about 2900 fps with that load. Yes, it is at max or lightly over, depending on your source. Accuracy was .6in at 100 yards with 5 shots. Very consistent. The DPMS is a 1:9 twist barrel. I get .48 groups with lighter bullets. But the lighter bullets blow around even as close as 200 yards.

I single feed these with the Orginal Bob Sled loading block, which is legal for some venues.

Remington, Winchester and LC brass has slightly more capacity than Hornady, Federal and Nosler. I shoot Remington mostly. I just moved to Nosler, and am working my loads up again from min.

Hornady 75gr BTHP, Berger 73gr, and Sierra 77 SMK are all bullets that can be loaded to magazine length and not suffer ill from bullet being seatly too deeply. Also try Nosler CC 69gr, Sierra 69gr SMK and Hornady 68gr BTHP.

 

[JimPGov]

ForneyRider
hub
THANKS GUYS FOR THE CONSTRUCTIVE ADVISE. THIS IS WHAT I WAS LOOKING FOR. I HAD BEEN TOLD 24.5GR AND WANTED TO VERIFY. TIA JIM P

 

[P-32]

http://www.njhighpower.com/ check the Reloading Stuph. Might be what you are looking for. Keep in mind, your RRA NM will have a Wylde chamber which is not a bad thing. Made to shoot 5.56 and 223 very well.

 

[JimPGov]

P-32

that was a great link. Confirmation that 24.5gr of varget is a good place to start. Thanks jim p

 

[hub]

Confirmation that 24.5gr of varget is a good place to start.

While I don't have too much reloading experience I wouldn't think it's a good idea to start out with a load that is one grain higher than the maximum in the Hornady manual. Considering your using Hornady's bullets I would probably go by their manual on that load.

Granted in my other manuals Nosler didn't have info for 75gr, Lee states 25gr as a Max load and Lyman shows 25+ as well but I still think you should work it up to that point. It may be safe in others rifles but who know how it will act in yours not to mention what load will produce the best groups. I am not saying 24.5 won't be the best load, I just think you should do some testing to make sure.

Anyway that is just my opinion, like I said I'm pretty new to reloading and I don't have much experience but starting at or above a max load in a rifle you haven't worked up before just don't sound like a good idea to me.

 

[ForneyRider]

Nosler won't have 75gr loads as they don't make a 75gr bullet for .224 caliber.

I agree with hub, work a load up.

Occasionally, I get best accuracy with min. load.

 

[westerngrizzly]

I use 24.5 grns of varget. with the 75 hpbt. it shoots well but it is pretty high in the pressure area. thats pretty much the standard. i used 24.0 grns for a long time. and changed my primers from WSR to rem 7 1/2. then i bumped up the load.
matt

 

[JimPGov]

westerngrizzly THANKS. ANY EXPERIENCE WITH FED MATCH PRIMERS? JP