Should have added mine is a 7tw. 38gr 4350 started at 2650 and sped up to 2711 over 100-120 rounds. To say I did no load work up is an understatement. I will speed it up to 2750ish with 4350 and see what happens but man it’s hard to mess with a good thing, even if it is a little slow
25x47 Lapua load data
- Thread starter JMGlasgow
- Start date
The 25x47 is a very nice balance. That extra 50fps buys you nothing really, let the rifle tell you where it wants to be.
I placed very well with it in our local league this spring/summer. I was running a deadair ti XC with the recoilX brake and had no problems seeing what I needed. Rifle weight around 20# all up.
I have had good luck with 7.25 twists in both my 25GT and 25x47L. It keeps my SG above a 1.5 per Bergers calculator down to 0 degrees and 0'ASL at 2650fps.
7.25 sounds perfect, just not a lot of companies offering that without extended wait times. I wish Ace would start offering 25 cal, you can generally get whatever twist you want in less than 75 days.
2710 is where my x47 is very happy. The other day I was getting some weird SD’s like some 10 rd groups were literally 15-17 and others were 5-7 and I have no clue why. I grabbed a few new pieces of brass and it immediately went back down to 5 so I’m not sure what the hell is going on with the used brass. It’s only got 4 firings. Funny enough it’s the first time I used the SAC press was processing this used brass….
I’ve gotten in the groove of pulling them at 2k. That way nothing funny happens at a match. I’ll still shoot them some or put the barrel on a buddy gun to dick around with at the range but that’s pretty much it.
Pretty serious competitor local to me has pulled a few 6.5x47 barrels low to mid 2k rounds because of funky shit happening. That chamber is supposed to last 4-5k rounds. The barrel life estimates you hear font factor in 10-12 rds sub 2 mins.
I decided to try the N555 in the 25x47. Amazing results. 135 Berger at .045 off lands shot best. 40.8 of N555 ran at 2812 with super low SDs. Last 10 shots were 2811.6 and SD of 1.6. I wish I could have run them all together but the Garmin does not let me continue a string. We turn it off between sessions due to heat, they will shut down. All strings I ran were under 5 for SDs over 60 rounds. I trued up my QL profile and 40.8 is 1.6 off max. I only went to 41.5 on the ladder as it was compressing. Group size was .27". We ran it all the way to 2k, shot fantastic all the way out.
I'll have to try N555 and see what happens, have a few jugs of that sitting around.
Any further info on this? I have a.180" freebore and basically cannot touch lands and still hold bullet - something amiss here? 135 hybrid that is.
I have 2 .180's and 2 more coming. I can measure when i get home but i have shot them from .015 off to .060 off. Pretty sure i still had plenty of neck gripping the bullet but ill measure and report back. The .180 is probably more suited for the Atip but i know a LOT of people running the .180 and the 135's, myself included with really incredible group sizes and SDs with both 4350 and varget.
People are using the .180 to keep pressure down and get the speeds you would expect out of such a cartridge. The .135 i used i was always around 100-150 fps behind the .180s with the "same" load. I could only get around hotrod 25 GT speeds out of my 25x47, although it shot good, seemed like a waste if you were going to try to push heavies. If i got another one, it would be a .180 fb. I would measure the chamber and see what mag length gave me with and without binder plate and make up my decision from there. Id probably stay with a pretty jump tolerant bullet like berger or sierra when doing the .180 fb. If youre going to try to use the secant style bullets id probably just buy a box or two before heavily investing in them and being disappointed if they dont work out.
I haven’t messed with my x47 much as I’ve been on a 6 dasher most all summer. 1000 rounds down the pipe at 2680-2720 on my 25x47 with the .180 FB and Berger 135s.
Distance to lands with a new barrel - 2.096
Distance to lands now - 2.166
Pretty significant wear.
Groups opened up from consisten .1-.3 moa to .5-.75 moa at around 900 rounds.
I shot it religiously at 2.070. So .026 off the lands since brand new… did a lot of messing with it today. Can’t seem to get it back under .5moa. Looking like it’s going to be a practice barrel until I decide to scrap it for good. Kinda surprised the wear it has. It’s a CRB 7.5T. MTU or MTU+ contour. It’s the next step lighter than their CRB Comp profile. That much wear it is like my damn 6mm creedmoors at 3050 FPS…
Yep, tried cleaning it mildly, didn’t help, tried the thorroclean, didn’t change anything either. Carbon ring is non existent.
This barrel was one of my top 5 best day to day the most precise I’ve ever shot. Up til now I guess! It just flat out shot so well before.
Distance to lands with a new barrel - 2.096
Distance to lands now - 2.166
Pretty significant wear.
Groups opened up from consisten .1-.3 moa to .5-.75 moa at around 900 rounds.
I shot it religiously at 2.070. So .026 off the lands since brand new… did a lot of messing with it today. Can’t seem to get it back under .5moa. Looking like it’s going to be a practice barrel until I decide to scrap it for good. Kinda surprised the wear it has. It’s a CRB 7.5T. MTU or MTU+ contour. It’s the next step lighter than their CRB Comp profile. That much wear it is like my damn 6mm creedmoors at 3050 FPS…
Yep, tried cleaning it mildly, didn’t help, tried the thorroclean, didn’t change anything either. Carbon ring is non existent.
This barrel was one of my top 5 best day to day the most precise I’ve ever shot. Up til now I guess! It just flat out shot so well before.
Prs 90sec par times with 10-12 rds gonna eat any throat whether it's a 6br or a 65x47, and all between.
That does seem like pretty accelerated wear - .007/100 is hot 6 territory, yeah. Not that it makes that much difference, but I'm curious, what powder are you running?
You did a lot of messing around, you said - you didn't mention it, so I'll ask - have you tried seating them longer to get back to the jump you had when the barrel was new (should be around 2.140)? Has it slowed down, too, or just lost accuracy?
When ever mine did that, messed with seating dept, didn’t do anything. Completely redid the load development finally found something that worked good enough but it started doing stringing shots high slightly after. Figured my crb barrel died around the 1400-1700 mark.
I’m running H4350. I may use varget with the next barrel though, because I do seem to average slightly lower SDs with it, that and I bought 9 jugs of it the other day so I’ll be set for a long time.
I did seat them longer. Between .015-.030 were okay, kinda how it was before. It always shot best closer to the lands. But it just doesn’t shoot nearly as good. Seems like any longer than that it falls off and throws shots. I ran about 75 rounds testing it today with a little bit lower and higher powder charges, like .1-.2 higher or lower. That and jump between .015- clear to .090.
With a .180 freebore seating them where my barrel wear is at now, seating them .015 off the case neck is barely gripping the bullet.
Yep. Almost exactly what mine is doing. Throwing weird shots. Lost some speed too. Same lot of powder, I’ve had to add a few tenths just to keep it where it was.
It also doesn’t help that I found a load for it with pretty much zero load development. So from like 20-900 rounds that is basically all it saw. I practiced with it at my place the same way I shoot a match. 8-12 rounds at a max of 120 seconds.
I have an identical barrel I will toss on here in the next month, and spread those strings out and compare the results. I imagine its life will be far greater. Plus, it was a hot as fuck summer here in IL. So with 90-95 degree ambient temp, the barrels don’t cool down that much…
