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Forum Index > Rifles general discussion > Reloading Newbie

Reloading Newbie

07 Mar 2014
@ 10:30 am (GMT)

Shelby Martowski

Hello from Canada. Hey guys, being new here I’d like to say hello. To Nathan I’d like to thank you for a awesome site with loads great of information. I have done a fair bit of reading here in the past few days on some very interesting topics.

I’ve been hunting since I was a boy. I shot my first deer with a .243. When I was 18 I bought my first rifle, a Remington 7mm mag. BDL. I’ve been shooting that caliber ever since, 40 years now. I also bought a Sako 85 in the Remington 7mm Ultra Mag back when they first came out in 2000 I think.

I have recently built a reloading bench and plan on getting into reloading. I have had the equipment for a few years now. I always wanted to build a quiet room to do my reloading in. But that never seem to get off the ground, so I built the bench first. Maybe the room will come next.

I have a couple of questions. One on reloading and a general one.

First, the 7mm Ultra Mag I have has had only 30 rounds through it since I bought it new. Is it too late to use your barrel break in procedure on it.?

Second, do you have a method for find the optimum bullet seating depth? I realize there will been some experimenting to find the correct depth that each of my rifles like.

OK one more. Will changing the seating depth from the factory setting have an adverse effect on the barrel life of my 7mm RUM? I wouldn’t think so but like I said I’m new to reloading.
Thanks for the help.

Replies

07 Mar 2014
@ 02:35 pm (GMT)

Nathan Foster

Re: Reloading Newbie
Hi Shelby, welcome aboard.

OK, lets get to it.

Sako generally make a very smooth bore and in most instances, there is little requirement for a barrel break in. However, a rough chamber or bore will crop up from time to time requiring attention. Each barrel has to be treated on an individual basis and the best way to get a basic handle on your bore is to observe the muzzle for rate of copper fouling as per the article. After shooting, you muzzle will tell you where the the bore is at and whether it needs breaking in. So the answer to your question is yes, you can break it after 30 shots- if it needs it. Further down the article you will read about the importance of regular throat care, especially with regard to your 7mm RUM. To this end, you will need the break in kit that I use regardless of whether the bore has broken in or not.

Next question. In the rifle accuracy section of the KB, you will find an article about determining the optimum COAL for your cartridge. Your 7mm RUM has an extremely long throat so you cannot seat close to the lands- it is physically impossible. Instead, you will have to seat for optimum concentricity (as per the article). But you will also have to take your magazine length into question. For example, if your magazine has an internal length of 3.622", you will need to seat to 3.582" for smooth feeding. Could you please post your internal mag length please because I have not yet measured the capacity of an 85 in 7mmRUM.
In summary, you will have to balance optimum COAL and magazine length. Bullet jump will probably be around a half inch as per the limitations of this cartridge design.

Last question. Altering seating depth will not effect throat wear.
07 Mar 2014
@ 08:58 pm (GMT)

Shelby Martowski

Re: Reloading Newbie
Hi Nathan,

Thanks for the reply. The inside measurement of the magazine on my Sako 85 is 3.695” or 93.87mm. I had a bit of trouble trying to get an accurate reading on the actual inside case of the magazine so this measurement is the plate on the end of the spring that pushes the shells up. Hope that works. There is about 1mm play on either side of the plate.

Looks like I have more reading to do, :) thanks.
11 Mar 2014
@ 04:05 pm (GMT)

Nathan Foster

Re: Reloading Newbie
Hi Shelby, thanks for measuring the magazine. Your rifle has a decent internal magazine length to work with. You will need to seat bullets to 92.87mm for smooth feeding, then observe concentricity- i.e: make sure the bullets are fully seated into the case neck. If you are using 160gr bullets and heavier, this won't be a problem, simply set to 92.87mm and work up test loads.

Hope that makes sense.
13 Mar 2014
@ 10:28 am (GMT)

Shelby Martowski

Re: Reloading Newbie
Hi Nathan, and thanks for that. Yes my plan is to use the Nosler 160gr partition. I've been using it for many years. I've had friends reload for me in the past. This bullet has never let me down. And after reading your articles in the KB and a thread where you recommended it to another guy I know I can't go wrong with it. BTW I finished up my bench last night and just need to get my equipment mounted.

Thanks again.
 

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