bigcountry

Your going to have to make you a split neck case and see where the lands are. Its in most manuals how to do it. Do you have any tools like Comparitor to measure the ogive? I suggest loading .02" lower than where it hits since you hare seeing these signs.

Did you have hard bolt lift? Punctured primers? Flat primers alone does not always mean high pressure. Did you trim your cases to min length? Do you have extractor marks on the case? Primers is just one indicator to watch for.

haugenna

I have a swiss armyknife, some duct tape, happens to be a gallon of gas here, oh and this match.

I will revisit this thread when I get back home.

Till then

Vapodog

Get a chrony and clock the loads.....IMO Barnes is out to lunch on this load.

75 Grains RL-22 is too much for a 180 grain monolithic in the 300 Win Mag.

I'm thinking a chronograph will confirm velocity of 3000.....or more.

Just an opinion here.

eldeguello

Contrary to popular myth, COMPRESSED powder charges DO NOT cause pressures to "skyrocket"!

As long as the quantity of powder is not excessive for the bullet being used, compressing the charge will not cause significant increases in pressures. Maximum pressure occurs after the bullet is at least 4 to 5 inches down the bore ahead of the chamber. Compressed charges are quite acceptable as long as the case shoulder is not bulged by seating the bullet, or the compressed charge does not cause the bullet to come out of the case.

eldeguello

Roscoe has an excellent point here, as a tight neck WILL cause problems. Not too many years back, we had a similar problem with excessive pressures in a .300 Dakota with under-max loads, just like you're having, and the problem turned out to be that the chamber neck was about .002" too tight with the brass we were using. This was corrected by increasing the diameter of the chamber neck.

Vapodog

A couple excellent posts by Eldeguello.....
compress loads skyrocket pressure???....where did this information come from?????....It's simply not true.

eldeguello

compress loads skyrocket pressure???....where did this information come from?????....It's simply not true.

Vapo, it came from here (see bold above).

ShatoDavis

Read what I wrote smart @ss. I said "can cause" If you know as much as you pretend to know you know that I'm correct.

Read this next part very carefully!
Compressed loads are not necessarily dangerous. Much depends on the type of powder used and the amount of compression. Generally speaking, compressed loads using slow burning powders are seen frequently in many reloading manuals. Since the overwhelming majority of us do not have the proper test equipment, it is not wise to attempt loads of this kind unless they are obtained from a reputable source. They will be annotated as "compressed" in the text.


I was more concerned that he was using an improper source for his reloading data.

Again, do not attempt compressed loads unless you are absolutely certain of the source. Even then, do not seat the bullet to such an extent that it "crushes" or deforms the propellant in any way.

haugenna

UPDATE.

Here's the deal. I was out of town for work in lovely Bend, OR.....as most of you know is the home of Nosler. I got to talking to the folks at the Nosler store by the factory, and we discussed this same issue and did a test on a Tikka 300 Win mag. Well we found out two things. I am no where near the lands because the detachable magazine will not let a bullet get that long. I don't have the measurements in front of me but I was well below the length reaching the lands. Another thing, the bullet sure is seated deep because of that magazine.

So back to the drawing board I go. I am switching to Nosler partitions 165 grains, but let me throw this out, what grain of bullet works best with the 300 WM. It is a tikka t3 lite, 24" barrel with 1-11 twist. Let me know what you all think.

bigcountry

Honestly, I think your overthinking this way too much without doing some of your own homework. Unless you took your gun to nosler and they personally meausred your thoat, your advise from them is about what you paid for it. There is no shortcut for this stuff. You got to do it yourself on your gun. Its not hard, and important you know how to find distance to the lands if you stay in the reloading world. I took my gauges around 4 gun stores once and measured distance to the lands with 3 marked bullets in 300RUM. I got measurements from 3.66" to 3.90". Noslers test was on there guns. Thats the reason thier "accurate" load is 90% of the time not the "accurate" load.

I mean, are you looking for any other pressure signs? Hard bolt lift? Extractor marks? Case head expansion? Well over velocity? It doesn't sound like you ever went back to try find the following? If you have trouble with TSX, your going to have trouble with 165gr partition.