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  #1  
Old 08-20-2007, 03:19 AM
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New 7mm-08


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Hi all, have been lurking for awhile and love this forum!

I just bought a new Rem Model 700 7mm-08 and am looking for that killer 300-500 yard target load. Buddies and I shoot 2-liter soda bottles and 1-quart oil bottles and the like for fun.

Anyway, I have a ton of Hornady 162gr. A-max bullets laying around (also have a 7mm Mag and 7mm RUM). This looks to be a bit heavy though for the 7/08, I'm thinking I need a bullet going about 2900 fps for accuracy but I don't know. Any good load data for 162gr or I guess I can try 139 or 140 gr. Gun has a 24" barrel with a 9.25" twist.

Something else, slightly OT, how about barrel break in? I'll buy a box or two of factory to run through it for break in, and then just shoot reloads afterwards. How much ammo does it take to do a good break in?

Thanks guys!
-Matt
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Old 08-20-2007, 05:26 AM
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Welcome to the site, there's a lot of good members and info. Congrats on your new rifle, I don't have a 7-08 but did you check Load Swap? Most manuals will recommend a powder for a given cartridge, that may be a good place to start also.

For barrel break in to smooth everything out, I'd say off the top of my head, 100 rounds or so.
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Old 08-20-2007, 06:44 AM
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I was told by the gunsmith that re-barreled my 7MM to fire 10 rounds, cleaning between rounds and then 15 more rounds cleaning between every 5th round. He also prefers heavy rather than light bullets because of the increased bore contact.
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Old 08-20-2007, 07:35 PM
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Loads for 7mm-08

I use Nosler Bullets in either 120 grain or 140 grain Combined Tech. How accurate are you talking for 300 to 500 yards? With the 120 grain bullet I get 3/4 group at 100 yards and 1.5 inch groups at 200 yards. It is the bullet drop at 300 yards to worry about. 120 grain is good for Deer and smaller I use for 140 for Black Bar
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Old 08-21-2007, 05:08 AM
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I don't run the 7 mm - 08 either, but woiuld expect that given the case capacity and bullet weight you mention, that Varget would be a good powder to start with. Perhaps even H4350, depending on the size of your brand of cases and you rparticular chamber.

There has been a good bit of discussion on the forum about break-in. Some find it worthless. Cut rifled barrels, as were once the standard, likely benefited most, since break-in will act as a strop on any burrs or wire edges left by the cutter. Other than throat burrs, hammer-forged barrels will likely not benefit, since they are formed against a mandrel and are pretty smooth already. Button rifled barrels could go wither way, but mostly people have a hard time documenting any real effect.

Personally I have found firelapping is necessary to make a dramatic difference in cleaning and to achieve accuracy improvement in barrels with bore imperfections. Hand-lapped barrels will likely benefit not at all from either break-in or firelapping unless, again, the throat has a lot of burrs from the chambering reamer.
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  #6  
Old 08-21-2007, 06:39 AM
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Thanks for the follow up, guys. Think I'll just run a box of factory through while getting my scope pointing in the general direction and give it a good cleaning out.

In terms of accuracy, I'm not going too wild. A 2-liter bottle is what, 14 inches tall and maybe 4 inches wide or so? Now granted at 500+ yards that's not much to shoot at but it's fun. Most of those bottles we keep within 250 or 300 yards so nothing with surgical precision (although I wouldn't mind that hehe). Probably won't hunt too much with this, maybe a groundhog eliminator.

Have heard good things about Swift Scirocco bullets, anyone have an opinion of them? 150gr is looking to be a smidge heavy for this gun. I absolutely *love* the Hornady 162gr A-Max but I'm really afraid they will be way too heavy to get good performance.

Thanks for the input guys.
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Old 08-22-2007, 03:23 AM
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Hokie - with that barrel length and rate of twist I don't think you will have any trouble with heavier bullets, in fact, it may prefer heavier bullets. That is the case with my BLR and it has a lightweight 20" barrel and a 9 1/2 twist. I shot 139s and 140s in it for a couple years because those are the popular weights for the caliber, but when I jumped to 150 I saw an improvement and 160 was better yet. If you can find an October 2005 issue of HANDLOADER there is an article in it by John Haviland where he lists loads for various barrel lengths and bullet weights.
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Old 08-22-2007, 03:35 AM
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Here's examples for a heavier load from the Haviland article, this out of a 22-inch barrel:

162 Hornady SST 45.0 W-760 2694fps 2.84OAL 1.94" Group
43.5 IMR4350 2413 """" 1.90
39.5 Varget 2483 """" 1.20
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Old 08-22-2007, 05:52 AM
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I guess I should have put an emphasis on C.O.A.L., but I do think you can finder heavier bullets that will work for you. The Haviland loads note are all 2.84" and that is too long for my BLR magazine. I have to keep my C.O.A.L. at about 2.78, but I have no problem seating Sierra 160-grain Game Kings.
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Old 08-22-2007, 07:03 AM
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Awesome, I'll have to run a few 162gr. out and see how it does. Got some older different cans of powder laying around I may try, and 3 different bullet weights to mess around with. Thanks for the input guys!
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  #11  
Old 08-22-2007, 02:09 PM
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Bullet weight

Hokie the one factor you have to account for is the heaver the bullet the slower it goes and at longer distance the bigger the drop from center. My rifle likes 2 bullet weights, the first is 120 grain and I push it at 3000fps and it has very little drop. the 2nd is 140 grain which I push at 2800 fps and it has twice the drop at 200 yards. If you are shooting 300 to 500 yrads for fun I would go with the 120 grain, so you do not have much drop and you can push it faster. Does a 2 liter bottle know the difference of 20 grains? If you hunt with the same rifle just sight the different bullets and write down the different adjustments from your zero bullet.
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  #12  
Old 08-23-2007, 05:00 AM
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If anyone needs some inexpense hunting bullets I would make someone a great deal. I shot again yesterday and my rifle certainly prefers 160s to 140s so I have some Barnes, Nosler, and Speer 140s I will probably never use. I'm going to keep some Hornady 139s just to have around.
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