25-284 barrel length question
- Thread starter jrkotz
- Start date
The two cases; 6.5x284 and the 6.5 PRC have very similar case capacities. The handicap is the barrel length related to the powders needed for the velocity allowing the 6.5 Creedmoor to look nearly as good. You can adjust the powders for those shorter barrels but the difference is magnified when the barrels are longer. Yes, the Creedmoor is efficient but it will not keep up with either of the other cartridges with longer barrels.
I don't have the PRC in QL. I don't have the latest QL update. Sorry mate.
Yes the 284 parent case and 6.5 PRC case is so close, it's hardly noticeable. I load for both and these are nearly twins. Considering a 25-284 in the near future over a 25 CM. I believe it will certainly outperform the CM performance in a 28" barrel.
AckleymanII
Gold $$ Contributor
+1
Wise advise here! TON of MUZZLE BLAST indeed!
Spend money on fast twist, heavy for caliber VLD bullet, now subtract 240 fps for long range shooting...does not make any sense at all to me. I would forget the can, put on a 26" #4 contour. Run a Rem long action in a McMillen Edge stock....done!
I shot out two 25/284's and two 6/284's, throat erosion is real...plan for success for many years to come. Memory is kinda foggy in this area, but seems that I remember that I had .006 leade growth every 50 rounds fired. Shocking Leade growth in combo with short actions was alarming for the short action 25/284's and chasing the lands...IMR 4831. I put the 6/284 on a long action with shortish leade, life was good.
IF you can chase the lands, you will have a 850 round barrel for extreme accuracy. If you can not chase the lands, you maybe shooting 3/4-1" groups at 450 rounds or so.
This was a very expensive lesson for me to learn while hunting coyotes. I am trying to pass on some hard learned lessons. Hope I have not offended anyone.
N165, N160, H1000, and AA2700 would be powders that are cooler on the heat index that may extend throat life. I saw a decrease in throat wear with the 243 AI shooting AA2700 with throat wear being .070 (approximately) in 2000 rounds.
I'm not doubting your data as I'm sure it's very accurate but we know velocity means nothing without accuracy. For the 25 CM, the accuracy node seems to be around 2940-2970. Push it faster and groups seem to diminish. Two local range shooters here at my private range shoot a 25-284. One with a 24" and the other a 28" barrel. Both guns built for different purposes. Their best accuracy is in the 3125-3150 range. This is with the 131 grain Ace. Looking at their info, it puts those numbers between the two at a very different place. Talking to a few other guys on forums that shoot the 284 parent see their best accuracy near 3200 fps. All using H4831sc powder. This appears to put the two at around 200 fps different. While it may not be huge, it's certainly why the guys going to an ackley version of a cartridge do it. I'm undecided which way I'll go. May wait for the 257 Blackjack reamers or may go with a 25-284. It'll basically come down to which size action I want. It will definitely be one of the two tho.
This is all in line with my findings as well. I have nodes at 3080ish, 3150-3160, and 3200. This is from a 257AI not a 25-284, but same bullet and powder capacity. Norma MRP, H100V, 4000-MR, H4350 all work great. And yes, with heavier bullets, a longer action and correct throat length the 257AI is considerably more powerful that the standard ‘Bob.
What twist did you end up going with?
7.5. Hoping the 24 inch barrel won't handicap me much
It shouldn’t. I’m running a 25” barrel for my speed data. I will probably go 27” next time to bring pressure down a little bit for the same velocities. That will put me at ~30” with a brake.
Interesting!
I've found an accuracy node for my 250 Savage (24" barrel running 1:10 twist with 75gr Sierra HP Varmint bullets) right around the 3,150 mark also.
Grouped well enough from my sporter barrel that i've decided to build my bench rest rifle on that combo.
26" Shilen ordered in 250 Savage, 1:10 twist.
Most of my shooting done within 400 yards, hoping to get by without the need for the heavy, high BC bullets.
As an aside, Berger is claiming about 30fps per in of barrel length for the 25 calibers they have listed.
NC308 u are right. 25-06 and 6.5-284 are almost the same in H2O capacity. Kurz recommended H1000 I never could get enough in a 284 case to get speed. But VV165 is as cool or cooler (right next to each other on temp chart) than H1000, and you can get enough of it in the case, even more than enough.
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