about to buy new brass for my 3oo.in the past i have used both rem and win brass,however i'm wanting to improve my handloading/group size.this is a factory rem rifle,so if cost is no object what brass? another thing is will i be likely to see an improvement in this gun by purchasing better brass and improving my case prep i.e. weighing,flash hole cleaning,necking turning etc. many thanks for your input,jimm
I to shoot the .300 WM in a custom MD.70.I can't guarantee this will help but this is my routine:
1.I use either Norma or Lapua brass (currently Lapua)
2.Check brass for defects
3.weigh brass to +/- one half grain
4.Mic necks to get an average thickness
5.turn necks to within.0002" usually about 70-80%-to make neck wall thickness pretty even leaving it as thick as possible while uniforming.
6.After expansion trim to even length
7.deburr and chamfor necks
8.deburr and uniform flash hole
9.Uniform primer pocket
10.Hope that all of this prep is not a waste of time!!!
I essentially prepair the brass to benchrest standards,because it makes me feel that I have the best possible ammo in the rifle chamber.Then if I shoot a bad group,I can't blame the ammo.
Almost forgot,I check the seated bullet for run-out,not to exceed .0015"to .002",hopefully less.
After posting this,let me say that my smallest 3 shot group was from a Hornady H.M.180gr.factory load:.061".This is what I do in the way of brass prep.I enjoy it.Hope this helps.
It's winter time. I can always tell when we have to much indoor time and not enough time at the range. Neck turning won't gain you anything in a factory chamber! Unless the reamer was at the limit of it's life and cut to the vary small side of SAMMI specs.. What is the purpose of neck turning in the first place? We are turning necks to achive a clearnce fit. How much clearnce do we want? One thing that you need to know is what is the dia. of the chamber's neck. If you take off materal around the necks of your case that you will fire in the SAMMI spec chamber, it is going to make the necks a sloopy fit. Unless you are prepaired to spend a bunch of dollars in tools for this job don't waste your dollars. I might add that goes hand in hand with a pile of dollars in rifle work. A tight neck chamber means good by to ever shooting another factor load in that barrel. If You think nobody looses ammo going on a hunting trip and doesn't have to get ammo along the way, well just tain't so. The guys that want to tell you about the one,two or three small groups they shot doing this or that are only fooling themselves. You want to know what they will do in the aggargate (five shots on each of five targarets) On what kind of day did small group happen. what where the conditions? If you are new to all of this then a trip to a long range match or to a benchrest match would be worth more than I could write in the next year. There is all kinds of accuracy persuits out their. Longe range hunting, the best advice is to buy a case of your favorite powder (four eight pound kegs) a case of bullets (2000) a case of primers (5000). Get what ever brass you like and can afford and burn up that barrel with practice. One tool that can help you, is a tool to help you find that good brass. That tool is a case concetricty gauge such as the one NECO sells. This will help you find cases that have bad necks (which means that part of the case is thicker all the way on one side)way out of range compaired to others. If you can find a place to shoot all of these long ranges we see in print and burn up that barrel doing it, you will be well ahead of the rest of us guys that spend our time writting about shooting! [img]/ubbthreads/images/graemlins/wink.gif[/img] P.S. I've found good and bad lots of brass in all the above name brands. The name don't make for good!
"A HUNTER SHOULD LIVE OFF HIS GUNS" JOHN TAYLOR
Hey now, with some of the cheaper brass you can get lots with brass that is slightly thicker on one side than another, and neck turning will make it so at least your neck is concentric. Of course, when you shoot and size again, you start all over with lopsided necks (at least at the base of the neck).
"Buzzards gotta eat, same as worms" - Josey Wales
Yes sir, The neck being thicker in one spot is really telling you that the rest of the case has a thicker area the full run of its length. Try this when you find a case thats out in the neck, cut the case length wise and use a ball mic to measure the case walls. In some of my barrels I shoot fitted necks, with the bullet seated I want a clearence of .001 for a total. thats .0005 on the sides. The reason I want this type of fit in these barrels is the chambers have under size necks and this fit gets them as close as possible to the center of the bore. Before I cut these neck I spin the cases and only select necks with vary small amout of TIR. These barrels are not hunting barrels but match barrels. You are correct, you can not shoot the lopsideness out of the brass. By the way when cases that are really well fit in a well chambered barrel cut with a vary well made reamer, you can load the heck out of them and they really last a long time. of course for the most part at this stage of the game you are sizeing in a die made by a resize reamer made by the same people that made your chamber reamer. They have figured the spring back of the case after firing and know how much you need to pull the case walls back to get a close fit after resizing. This die will of course contain a provision for using neck sizing bushing, these will alow you to adjust the neck tension for what ever bullet dia. you will be using. Now this changes (the Dia of the bullet) with each lot of bullets. this measurement is made at the heel at the pressure ring. When you buy custom (non machine made)bullets the maker will mark on the box the pressure ring number for that die with that lot of jacketts and cores. The problem you get from mass produced bullets is that the machines have a number of different dies produceing the same bullet all going into a common area and are picked up and marked as a lot. (see the problem) not all dies are created equal. This is why when you see differences in ojives we scratch our heads and wonder. That run or lot is not all comeing out of just one point die. A talk on the phone with a custom bullet maker can be a dime well spent. Or better yet invest the 1000's to make your own and find the true meaning of being taken for a ride by the jackett makers. Good books are available on bullet making and these are a great help in understanding just how much is involved in tring to put all five in the same hole. Do we really need all of this in longrange hunting? I leave that answer in your hands! [img]/ubbthreads/images/graemlins/wink.gif[/img]
"A HUNTER SHOULD LIVE OFF HIS GUNS" JOHN TAYLOR