6mm-284

RiverRider

Handloader
Dec 9, 2008
1,436
71
The "search" function turned nothing up for this cartridge in this forum, so if this is redundant...well, uhhh, sorry. Maybe I need lessons on how to use the "search" function in addition to insight on this cartridge.

I'm looking for handload insights, but here's a little about the rifle...

I swapped into this rifle a couple of weeks ago and am getting it ready to shoot. The rifle is a custom built off a Mark X action. The trigger is the Yugoslavian-made fully adjustable trigger, and I have to admit this one has cooperated so well in the adjustment department that a Timney will not be required as I am perfectly satisfied with it (this was not my experience with the same trigger on a Remington 798). The barrel is a take-off, make unknown. I know this because the bottom side of the barrel has holes tapped where a rear sight once was mounted. The barrel length is 23-1/2" so I am pretty sure is was once probably a 26-inch barrel. The stock is an older (I think) Bell & Carlson fiberglass, the type with the sling pivots integrated into recesses in the bottom of the stock, no swivels and no studs.

The bedding was laughably atrocious. I knew I'd be refinishing it, BUT! Someone globbed a bunch of epoxy in the area around the recoil lug. I am pretty sure there was little if any contact with the barrel in the area forward of the recoil lug, and I was definitely not impressed with any of the "bedding job" that had been inflicted on the poor girl. I have completely redone it, in fact I have revamped the stock entirely. I have developed a method of bedding a 98 Mauser action so that the bottom metal is snugly in contact with the underside of the action with the guard screw completely tightened, thereby taking advantage of the "pillar" the bottom metal is endowed with and in such a way that there is no stress on the action. If done right, I believe it is completely "stress neutral" (I've done this on my other two 98-based rifles and they shoot *lights out*). On this B&C stock, it turned out to be a lot more work than I anticipated but I am nearing completion on it.

Anyway...enough about the rifle!

I am planning to shoot 95- or 100-grain Partitions (I sure hope it likes them!) propelled by either Ramshot Magnum or H4831SC. I am willing to try H1000 if either of those two powders don't preform.

I am aware of the need to check neck clearance and I have some cases that were fired in this rifle so I can check this stuff out without taking unnecessary risk.

If anyone has used these powders with 95-grain Partitions in 6-284, I'd appreciate any insights or suggestions.
 
Pretty much identical to the 240 WBY.

Start low work up slow.


Cartridge : 6-284 6mm/284 Shehane
Bullet : .243, 95, Nosler BalSilTip 51040
Useable Case Capaci: 59.009 grain H2O = 3.831 cm³
Cartridge O.A.L. L6: 2.591 inch = 65.81 mm
Barrel Length : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 52032 psi, or 358 MPa
or a maximum loading ratio or filling of 111 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

184 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Vihtavuori N570 103.9 59.6 3.86 3269 92.7 52032 15180 1.204 ! Near Maximum !
Hodgdon Retumbo 107.3 58.7 3.80 3263 99.7 52032 14152 1.197 ! Near Maximum !
Hodgdon H870 110.3 62.0 4.02 3251 94.9 52032 14828 1.208 ! Near Maximum !
Alliant Reloder-50 111.0 65.3 4.23 3250 92.6 52023 15316 1.229 ! Near Maximum !
ADI AR 2218 107.4 62.2 4.03 3247 91.9 52032 15317 1.189 ! Near Maximum !
Alliant Reloder-25 100.4 54.3 3.52 3239 100.0 52032 13412 1.200 ! Near Maximum !
Norma MRP 92.8 52.7 3.41 3228 99.1 52032 13779 1.212 ! Near Maximum !
Norma MRP 2 102.7 55.9 3.62 3227 97.5 52032 14074 1.216 ! Near Maximum !
Ramshot Magnum (Big Boy) 97.6 56.8 3.68 3226 97.5 52032 13882 1.199 ! Near Maximum !
PB Clermont PCL 517 97.9 56.9 3.69 3226 97.5 52032 13871 1.199 ! Near Maximum !
SNPE Vectan SP 12 97.8 56.8 3.68 3225 97.6 52032 13851 1.199 ! Near Maximum !
Vihtavuori N560 94.4 52.5 3.40 3219 96.3 52032 13928 1.205 ! Near Maximum !
IMR 7828 SSC 93.5 52.3 3.39 3215 96.9 52032 13593 1.192 ! Near Maximum !
IMR 7828 98.9 52.3 3.39 3215 96.9 52032 13593 1.192 ! Near Maximum !
Accurate MAGPRO 94.9 54.9 3.56 3205 94.8 52032 13963 1.214 ! Near Maximum !
ADI AR 2213 94.5 51.9 3.37 3201 96.8 52032 13427 1.189 ! Near Maximum !
Raufoss RA15 94.7 52.1 3.37 3198 98.1 52032 13487 1.210 ! Near Maximum !
Alliant Reloder-22 94.7 52.1 3.37 3198 98.1 52032 13487 1.210 ! Near Maximum !
Bofors RP5/NP ~approximation 94.7 52.1 3.37 3198 98.1 52032 13487 1.210 ! Near Maximum !
Winchester WXR 97.2 52.3 3.39 3196 97.9 52032 13488 1.211 ! Near Maximum !
ADI AP 2214 98.6 55.7 3.61 3196 97.2 52032 13358 1.189 ! Near Maximum !
Hodgdon H1000 103.6 55.8 3.61 3194 97.2 52032 13320 1.189 ! Near Maximum !
Rottweil R905 96.0 51.8 3.36 3166 96.3 52032 13118 1.209 ! Near Maximum !
ADI AR 2209 91.2 49.4 3.20 3165 97.9 52032 12793 1.194 ! Near Maximum !
Bofors RP5 NT ~approximation 97.8 54.3 3.52 3160 94.6 52032 13111 1.193 ! Near Maximum !
Alliant Reloder-19 91.5 49.8 3.23 3159 97.9 52032 12827 1.203 ! Near Maximum !
Bofors RP14 ~approximation 92.2 50.2 3.25 3152 97.9 52032 12739 1.204 ! Near Maximum !
Vihtavuori 24N41 105.9 61.4 3.98 3136 85.8 52032 13356 1.199 ! Near Maximum !
Accurate 4350 90.2 46.9 3.04 3135 100.0 52032 12105 1.237 ! Near Maximum !
Hodgdon H4831 SC 93.1 51.2 3.32 3134 96.0 52032 12624 1.200 ! Near Maximum !
Hodgdon H4831 96.8 51.2 3.32 3134 96.0 52032 12624 1.200 ! Near Maximum !
Somchem S385 91.8 50.5 3.27 3122 98.7 52032 12350 1.226 ! Near Maximum !
IMR 4831 91.1 47.5 3.08 3121 100.0 52032 11839 1.226 ! Near Maximum !
Winchester Supreme 780 90.9 52.1 3.38 3114 97.9 52032 12255 1.210 ! Near Maximum !
Hodgdon US 869 111.0 64.3 4.17 3111 85.7 50992 13343 1.221 ! Near Maximum !
Accurate 3100 100.4 51.6 3.35 3110 99.6 52032 12122 1.244 ! Near Maximum !
Rottweil R904 90.6 48.6 3.15 3110 96.8 52032 12197 1.202 ! Near Maximum !
Vihtavuori N165 96.9 52.1 3.38 3109 98.4 52032 12085 1.215 ! Near Maximum !
Hodgdon 50BMG 111.0 61.3 3.97 3106 81.2 50777 13353 1.219 ! Near Maximum !
Vihtavuori N170 106.2 57.2 3.70 3105 91.1 52032 12838 1.226 ! Near Maximum !
Hodgdon Hybrid 100V 92.3 46.9 3.04 3104 100.0 52032 11194 1.214 ! Near Maximum !
Vihtavuori N160 96.8 50.5 3.27 3092 96.8 52032 11985 1.206 ! Near Maximum !
Lovex D100 103.5 60.6 3.92 3073 87.0 52032 12440 1.214 ! Near Maximum !
SNPE Vectan SP 13 111.0 61.7 4.00 3042 89.7 46523 13081 1.280
Vihtavuori 20N29 111.0 65.0 4.21 3003 86.0 44747 13170 1.303
PB Clermont PCL 513/520/9520 111.0 61.7 4.00 2967 86.7 43566 12749 1.319
Accurate 8700 111.0 61.8 4.01 2945 87.4 42488 12705 1.324
NC A3502 ,test only 111.0 59.1 3.83 2721 62.0 39196 10180 1.373
TLP A 502(RH) ,test only 111.0 59.1 3.83 2696 66.6 36899 10622 1.417
ADI AS 25 BP 111.0 20.3 1.32 2125 100.0 41974 4066 1.380
IMR TrailBoss 111.0 20.3 1.32 2125 100.0 41974 4066 1.380
V1734 7-multiperf ,test only 111.0 59.1 3.83 1925 30.5 20086 4987 1.842
 
Hodgdon has a great site with a bunch of good data... here's a link, they have a lot of 6/284 loads there. For what it's worth, I started just like I was shooting a .240 Weatherby when I built my first 6/264... loads turned out to be very close, and it came close in velocity to the Roy with a 24" barrel.

http://data.hodgdon.com/cartridge_load.asp
 
RR,
I have a 6-284 that I shoot with 95gr Bergers and RL22 my load is 54gr,CCI BR2s and Nosler 6.5 - 284 Brass necked down using a Redding Type S Bushing die. This gun(Howa 1500 w/26" Pacnor barrel) is .75MOA and pushing right at 3400fps. This load is over max and if you try it you should work up from well below 48gr. I show no pressure signs whatsoever but if I add .2gr I get ejector marks and at .5 over I get sticky on the bolt. I can only reach 52gr when I use Fed205Ms and that is max per most info that I've found. My brass is on it's 10th firing and I think if I anneal the necks I might get 5-6 more. This summer I'll be doing load work ups with 70gr BTs with Superformance and 105gr A-maxs with 7828. Good luck and I hope you find that special load. The Hogdon site and the Sierra manual have lots of good info for the 6-284.

Scott
 
Any other loads??? I am about to start load development now
 
Fotis, I ended up going with 54.4 grains of H4831SC driving 95-grain Partitions. With the OAL at approximately 2.92" I believe (based on QL) the load produces under 60,000 psi chamber pressure and velocity is healthy at a nice, consistent 3350 fps.

What bullets do you intend to try?
 
42 gr of IMR4350 and Speer 100 gr was a tack driver. I'm playing around with 7828 and 53 gr with a 90AB. Mine is throated pretty long. I can seat the 90AB right at 3". Here's a link to what she did with the Speers.


viewtopic.php?f=4&t=18639&p=163810#p163810

The one just low was first shot made a sight adjustment then 4 in a nice cluster.
 
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