300 mag 210 Beger

[seek100plus]

I am very brand new to reloading and want to load some 210 Bergers

I have figured out my COAL can only be 3.64 to fit in my magazine. I will be using H 1000 and start my loads from 74 grains to Max loads of 76 , not sure if I can go above 76 grains with out pressure problems.I will be useing Winchester cases and Winchester large rifle for magnum load primers

I'm not sure where my bullet will sit off the lands with bullet set at 3.64 , but have to set that depth because of magazine.Don't want a single shot and don't want to hurt my rifle, but my 300 loves high speed. My barrel is a custom barrel 26.5 before break and I want to load H1000 to Max with 210 Bergers I wonder is 76 my Max load at COAL 3.384

[Benbrown]

Well, there are several things to consider. First, as you noted, you max COAL is going to be determined by the length of your magazine. I run all of mine through the magazine to be sure that they will feed from a full magazine--that may be several to as much as twenty or so one-thousandths of an inch less than the reading you get from your micrometer, depending on your magazine. If you want to know where that puts your bullet in relation to the lands, you are going to need to get something like the Hornady Lock-N-Load Straight O.A.L. Gauge, a modified .300 case and a good micrometer (if you don't already have one). (If you want to go first class, look at Sinclair's offerings--they are second to none and will last you the rest of your life.) You didn't say for which "300" your rifle is chambered, but if it's a factory round other than a Weatherby with the freebore, you probably will have to push the 210 Berger deep into the case, reducing effective case capacity. Second, starting 2 grains below what you think your maximum load will be is playing it fast and loose. I don't know where your maximum load data came from, but you should start ten percent below maximum and work your way up, watching your chronograph, your primers (for flattening or cratering) and bolt lift (when it starts to be a little hesitant when you lift it on a fired round). Third, you should be looking for accuracy, not speed. A hundred to two hundred fps at the muzzle won't make that much difference, even way out there. You just have to shoot at regular intervals out to what you consider to be your maximum acceptable range and generate a drop chart.

[Grumpy]

Well, there are several things to consider. First, as you noted, you max COAL is going to be determined by the length of your magazine. I run all of mine through the magazine to be sure that they will feed from a full magazine--that may be several to as much as twenty or so one-thousandths of an inch less than the reading you get from your micrometer, depending on your magazine. If you want to know where that puts your bullet in relation to the lands, you are going to need to get something like the Hornady Lock-N-Load Straight O.A.L. Gauge, a modified .300 case and a good micrometer (if you don't already have one). (If you want to go first class, look at Sinclair's offerings--they are second to none and will last you the rest of your life.) You didn't say for which "300" your rifle is chambered, but if it's a factory round other than a Weatherby with the freebore, you probably will have to push the 210 Berger deep into the case, reducing effective case capacity. Second, starting 2 grains below what you think your maximum load will be is playing it fast and loose. I don't know where your maximum load data came from, but you should start ten percent below maximum and work your way up, watching your chronograph, your primers (for flattening or cratering) and bolt lift (when it starts to be a little hesitant when you lift it on a fired round). Third, you should be looking for accuracy, not speed. A hundred to two hundred fps at the muzzle won't make that much difference, even way out there. You just have to shoot at regular intervals out to what you consider to be your maximum acceptable range and generate a drop chart.

 

I shoot a .300 Wm Chambered with a stock reamer but I built a bullet that fit the magazine before chambering to set my free bore. I use the 210 grain Berger's nosler custom brass and Federal 215m primers. I also use 69.5 grains of Re-loader 22 and the bullet is set 10 thousandths into lands.

This load is not the fastest load out there but it is deadly accurate (out past 1000 yards)......... I believe my max load is somewhere around 74 grains but my accuracy peeks at 69.5 then spreads out as I go higher .............. sometimes mores not better....... good luck

P.S. 76 grains sound a tad bit hot .......... make sure you start out at about 69 grains

Grumpy