Thinking about getting a Seekins HIT rifle in either 260 or 6.5 Creedmore. Would be shooting PRS out to 1000 yards. Which cartridge is easier to develop accurate loads for? Leaning towards the 260 because I have a lot of 308 brass. Yes, I would buy brass for either, but if things ever get crazy having the ability to make 260 brass would be nice.
260 Vs. 6.5 Creedmore
- Thread starter MMH
- Start date
308 won't convert nicely to 260 Rem because you'll need to turn the necks at a minimum.
In converting 308 to 7mm-08, I had about 10% scrap due to "spring back" by the brass. Some brass just wouldn't size down. I imagine that would be higher with 260. You might want to try necking up a 243.
However, knowing the PITA it would be to size brass for my 260 build, I bought two boxes of Lapua 260 Rem brass. They were 93¢ apiece back when I bought them. I think they're closer to $1.36 each now.
The 6.5 CM will have much better availability of brass and OTS ammunition -- but I refuse to buy one.
In converting 308 to 7mm-08, I had about 10% scrap due to "spring back" by the brass. Some brass just wouldn't size down. I imagine that would be higher with 260. You might want to try necking up a 243.
However, knowing the PITA it would be to size brass for my 260 build, I bought two boxes of Lapua 260 Rem brass. They were 93¢ apiece back when I bought them. I think they're closer to $1.36 each now.
The 6.5 CM will have much better availability of brass and OTS ammunition -- but I refuse to buy one.
Bump the 260 to 260AI and rock & roll beyond the 6.5 CM with better case life and upkeep. Virtually no trimming. The AI will allow M V upwards of 3000 fps with the 140 class bullets - right load/combo. Accuracy is cool too. Average M V for the two groups were 3016 fps from a 26 inch 1 - 8 tw. barrel.
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JMAN80
Gold $$ Contributor
This is a slippery slope! Lol
The 6.5 Creedmoor is, the EASY Button for, developing Accurate Loads with, GOOD Barrel "Life" and Lapua Brass is NOW available for, $115. per Hundred.
Peterson also makes GOOD 6.5 creed Brass.
Watch, Texas Plinking, 1 MOA, Steel Challenge,.. on YouTube, BEFORE,.. making up, your Mind !
PS; I went Kicking and Screaming over to, the "Dark side" of, the 6.5 Creedmoor and NOW,.. LOVE, mine !
Us Old Dog's, CAN learn New Tricks,.. after all !
Peterson also makes GOOD 6.5 creed Brass.
Watch, Texas Plinking, 1 MOA, Steel Challenge,.. on YouTube, BEFORE,.. making up, your Mind !
PS; I went Kicking and Screaming over to, the "Dark side" of, the 6.5 Creedmoor and NOW,.. LOVE, mine !
Us Old Dog's, CAN learn New Tricks,.. after all !
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JMAN80
Gold $$ Contributor
Hands down the easy button!
Yea, no two rifles are the same for sure. Just showing an example of what my rifle shoots. However, the 260AI is hard to beat within it's size.
B23
Gold $$ Contributor
Agreed, the 6.5CM is the easy button.
But, if you want a little more then either the 260 or 6.5CM offer Defensive Edge has their 260 Terminator dialed in and they have a PRS and Hunting version depending on which OAL length works best for your build/use and both are running 140's over 3000fps. Obviously something with an "improved" case requires fireforming but DE Rifles offers formed Lapua brass as well as dies so it's kind of one stop shopping.
defensiveedge.net
panhandleprecision.com
But, if you want a little more then either the 260 or 6.5CM offer Defensive Edge has their 260 Terminator dialed in and they have a PRS and Hunting version depending on which OAL length works best for your build/use and both are running 140's over 3000fps. Obviously something with an "improved" case requires fireforming but DE Rifles offers formed Lapua brass as well as dies so it's kind of one stop shopping.
260 Terminator
You have entered the home of data for the Terminator family of cartridges. Like all loading data this is just a guideline to help you and not absolute information. This is simply what worked for us in just one or two rifles with our lot of powder, bullets primers etc. It is still your…
defensiveedge.net
260 Terminator: Initial Review
The second cartridge from Defensive Edge with the Terminator designation, the 260 Terminator is based on the 260 Remington case and is designed to fire a 140 grain 6.5 mm bullet at 3000 fps while f…
panhandleprecision.com
JMAN80
Gold $$ Contributor
What bullet are you shooting & what velocity? I’m running a 140gr ELD @ 2800fps from a 26” barrel with no signs of pressure and rifle is happy…. Just curious where the 260 sits…
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I too am shooting 140 ELD-Ms with Lapua brass and CCI 200. With 42.6 gr of H4350 and an OAL of 2.895, I'm getting 2,860 fps. This is from a 1/8 twist 28" Criterion barrel.
My 6.5 Creedmoor with a 26" Hawk Hill 1/8 is running 2,730 with 40.8 gr of RL-16 and Alpha brass with the same ELDs. I'm in the process of changing to H4350 for the Creed.
The .260 load seems more consistent at 1K yards than the Creed.
JMAN80
Gold $$ Contributor
We are running H4350 @ 41.5gr but just swapped barrels to a 1:8 Criterion 28” and was probably gonna try same charge and same .02 off lands and see how it behaves. We are also using Lapua srp brass with rem & CCI BR primers.
140 ELD in my 260 Rem is 2860 with some peddle left. I've seen 2900+ easily but accuracy slips a bit. 26" barrel also. I'm leaning toward the CM if I'm not a reloader. Being a reload guy, I'd up the game to the 260AI as suggested above. It's a win, win. 90fps under the 6.5-284 and much better brass life then the standard 260.
JMAN80
Gold $$ Contributor
What powder are you seeing those speeds from?
B23
Gold $$ Contributor
Since the OP mentioned this will be a PRS gun, of all those mentioned, IMO the most practical/best choice is the 6.5 Creed. That's not to say the 6.5CM is the best cartridge because I don't believe there is such a thing as, the best, but rather some are better choices then others for a given use.
I think if I wanted more then what a 6.5CM or standard 260 Rem had to offer I'd skip anything "improved" and go with the 6.5-284. No fireforming and even in a short action offers 100-100+ fps advantage over the others. My 6.5-284 is on a long action and Defensive Edge +P'd the throat so I can't compare it to the others but with a 26in Shilen I'm sending 140's down range over 3200 using RL26,
B23
Gold $$ Contributor
I don't think it's a stretch to see 2900 w/140's in a 6.5CM using a 26in barrel and RL17 or RL26. With RL26 it'll probably be somewhat dependent on how long your freebore is on whether you can get to 2900 but RL17 will get you there with standard SAAMI FB.
RL17 is another one of those high energy powders that produces really good velocities but it isn't without it's quirks. I've used a fair amount of it and it never fails to impress with regard to velocity but you have to be careful not to get to greedy with it because it'll go along and not show any real signs of pressure so you keep increasing it little by little because you're a little velocity drunk and then all of a sudden, Oops, you just popped a primer. Yeah, ask me how I know that.
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