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Determine if Barrel is "Shot" . . . ?

 
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Old 12-30-2012, 09:45 PM
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Location: Boise, ID
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Determine if Barrel is "Shot" . . . ?

Hello Everyone. I'm new here (first post). I'm just testing the waters of this LRH stuff.

I have a USED Rem 700 SS 7mm RUM 26" with a brand new Vortex Viper 6.5-20x50.

I'm wondering how I can tell if my used barrel is "shot" / "burnt out". I have used several of my father-in-law's rifles with new barrels of various calibers on the same exact platform and have been able to shoot 3" groups at 200 yds prone using a pack as a front rest, no rear rest (I know, not long range, not even close). Obviously my front and rear rest situation is going to be adjusted to start shooting further. My new rifle has a very nicely adjusted trigger, optics are great, and it feels very steady. I have always felt very confident in "calling my shots" with regards to trigger pull and breathing. I haven't had a chance to load up multiple loads yet to determine what load my rifle likes best, but the best group I could get at 200 yards was 6"!!!! This is TOTALLY unacceptable and not what I have always been capable of. With that said, I was shooting Remington Factory 140 gr. Core-Lokt PSP.

Let's just assume that this particular load is the recipe that my gun despises the most . . . would a 6" group at 200 yards be within reason for the LEAST optimal load?

. . . or is my barrel not performing as well as it should?

It seems to me that even with a terrible load (even though it's "Factory") should shoot better than that.

I do handload, but I don't want to waste undue time and money chasing a white elephant and loading for a barrel that can't be pleased.

I just got a BRAND NEW 300 RUM barrel that I can swap out (I'm going to at some point this year).

Thanks all.
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Old 12-30-2012, 09:55 PM
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Re: Determine if Barrel is "Shot" . . . ?

First of all, the 7 rum is a heck of a round, but it can also be troublesome accuracy wise and your barrel life may be under 1000 rounds even if you treat it with kit gloves. I'm rather nice to my rifles and my 7rum's accuracy started to fall off at 600 shots. You should have well defined rifling without an area at the origin(right in front where the bullet hits first) that looks like it's been hazed or is nearly flat( little or no rifling is bad here).
That said, dump the rem factory load and load up some 140 nos a-bonds or sierra 140's with rl25 or retumbo and shoot them for accuracy(assuming you have a good throat and your chamber is good). If you want to go heavy use a well put together 175 and H50 bmg powder(or I 5010 if you can find any).

I eventually traded my 7 rum for a lh 300 rum and I'm still using the brass in that rifle. I'm thinking of re-visiting the 7rum though as that rifle was simply the easiest to kill with I've seen at over 1/4 mile. I only got 4 kills on the rifle before I retired it but they were at 600, 700+(the next morning), 400 and 200. Three of the 4 were running/trotting animals and none required more than two shots. Two were in rather stiff cross winds too.
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Old 12-30-2012, 09:59 PM
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Re: Determine if Barrel is "Shot" . . . ?

Just dug up an old target shot before rl25 data came out for the 7rum. I was using the 140 sierra pro-hunter, 95 rl25(93.5 is current top load-- respect it please), rem brass, fed 215's. 3.650" oal. 5 shots at .825" at 100 yards off sand from a 700 bdl rem with a 6-18x nikon on top.
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Old 12-30-2012, 10:07 PM
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Re: Determine if Barrel is "Shot" . . . ?

Thanks Lefty, VERY helpful. I'm hoping to get some time this weekend to load a little and maybe shoot I'll check the origin rifling when I get home.

I like this place already.
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Old 12-30-2012, 10:12 PM
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Re: Determine if Barrel is "Shot" . . . ?

Not knowing much about you cleaning, reloading and such. I would give the barrel a good scrubbing with a ammonia based cleaner and iosso and see how much copper and carbon come out. Then look at reloading and what not.


Brent
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Old 12-30-2012, 10:15 PM
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Re: Determine if Barrel is "Shot" . . . ?

Quote:
Originally Posted by blipelt View Post
Not knowing much about you cleaning, reloading and such. I would give the barrel a good scrubbing with a ammonia based cleaner and iosso and see how much copper and carbon come out. Then look at reloading and what not.


Brent
+1 -- the 7 rum will out foul most other rounds just as fast as it'll out-run 'em. Use the good stuff and remove BOTH copper and carbon. I nearly filled the rifling on my 7rum once using too much copper cutter and not enough hoppes type carbon remover-- make sure she is visually clean. Patches lie sometimes.
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Old 12-30-2012, 10:58 PM
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Re: Determine if Barrel is "Shot" . . . ?

I've tinkered with a couple "shot" out 7RUM barrels and all shot very well and had decent throats after a good cleaning, like has been said the carbon needs to be addressed in a serious manner! Try loading a heavier bullet also, I'm fond of the 175 GK in the 7RUM's.
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