350 legend today

Tomme boy

Tomme boy

Well-Known Member
I took the 350l out for a little bit. I got some more 358-200gr RCBS hp made up and coated. I gave them a week to settle after checking and sizing to 0.356"

I loaded up 5 sets with 5744. Started at 23gr and went to 25gr. 24gr started to show pressure and 24.5 was FLAT. But 24 gr showed to be the best for this combo. This was shot at 100yds. Not the greatest but acceptable. A lot better than some others I have seen that are on Youtube shooting jacketed. And not so bad as it is a Bear Creek Arsenal barrel.

Next is to test with the small HP to see how it shoots. I still have to cast them up yet. I switched the pins over last night.

Another thing is I was able to go to 26gr with this powder before it showed pressure with the Lee 200gr bullet.

20200702_102035.jpg
 
JWFilips

JWFilips

Well-Known Member
Spent the morning at the range just trying to empty as many Old & Hot 357 mag loads as I could through my S&W Pre-27 (1953)
I only started shooting cast bullets in the early 2000's The guys I hung with at that time had Magnumitis!
So I shot about 100 125 grain ( commercial hard cast) with 17gr 2400 and 158 with 14 gr 2400! Not pleasant My hand is black and blue!

Now that I am older ( & smarter ) I like the light manageable loads! But All In All I did pretty good off of a rest at 50 yds!
Did pretty good until the bore filled with lead! Back then those guys had me loading bore size hard cast bullet at max speed!
I sure know a lot more now about alloys from the folks here!
I had the choice of Pulling a few hundred bullets with a crimp or shooting them....as for tonight I should have chosen the former
 
Tomme boy

Tomme boy

Well-Known Member
I noticed when seating the bullets I had different tensions. The ones I had to trim because Winchester does not know how seemed loose. I think the mandrel for the RCBS trimmer is meant for 357 or 38. I noticed it after I had already had all my brass primed.

I have about 40 cases that are 1x fired I have to size and check the trim length. I will size again after I trim them this time. Next is to go up and down 0.2grs to see if things tighten up or not. Dang heat is really bothering me this year. So I may have to just get out at first light to beat the heat. Don't know how you Southern boys do it. I used to love the heat but not so much anymore.
 
Mitty38

Mitty38

Well-Known Member
Just wondering.
How tricky is the case length and neck size on those???
I know of a lot of people who expressed concern with pressure issues, trim length and head spacing when that round first came out. Especially around reloading.
 
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Tomme boy

Tomme boy

Well-Known Member
The brass was too long and was being swaged into the neck. It was not letting the bullet release and was blowing primers and head sepperations. All you need to do is make sure they are not too long. The best way would be to do a chamber cast to see how far your chamber is. Then trim to that length. I trim all of mine to 1.70". They have a 9mm 0.355" bore. Most all of the barrels out there you can only go to 0.356" for the bullet unless you use Starline brass. They are 0.001 thinner than everyone else's.
 
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Ian

Ian

Notorious member
Tomme boy said:
Don't know how you Southern boys do it. I used to love the heat but not so much anymore.
Click to expand...

It's not as much fun as it used to be, but not bad even now that the entire left side of my face and left shoulder do not sweat anymore, at all. Breathing Sahara dirt however is NOT fun.

Neck tension can sure screw with you, good idea to regroup the brass and start over now that you've narrowed a range. remember that horizontal can mean you pushed things a little too far and might go backwards 5-8% to work back up to that sweet spot. Don't you have a Lab-Radar chrono? can't remember who's got what anymore, but chrono could sure help. You are certainly getting real close to stick a fork in it and go hunting if you can get it to repeat.
 
fiver

fiver

Well-Known Member
that's kind of vertizontal.
one is saying go up more and the other is saying come down some.
 
Tomme boy

Tomme boy

Well-Known Member
I am thinking down. I just looked at the brass and even the 24gr load was pretty flat. I am using CCI 41 primers. I am thinking that was why I was able to go higher with the Lee bullet as I used regular Win SR in them.

The 41 primers are a MAG primer right? Along with a thicker cup?

Guy at the last show was selling the 41 primers for $26/1000. I could not pass that up. I bought 2 5K cases from him.
 
Brad

Brad

Benevolent Overlord and site owner
Staff member
I think the 41 is just a thicker cup. Designed to prevent piercing in the AR style rifles.
 
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fiver

fiver

Well-Known Member
yep standard just heavier cup is my understanding too.

still,, that's a good price.
they used to run right close to the same price then for some reason jumped up a good 5-6$ more than the regular ones sitting right next to them.
I have even seen them 10 dollars more.
 
Tomme boy

Tomme boy

Well-Known Member
CCI #41 - commercial version of the fully-qualified DOD primer for use in U.S. military ammo. With this primer there is more 'distance' between the tip of the anvil and the bottom of the cup than with other CCI SR primers. .025" thick cup. Same primer mix as CCI 450.

I found this on several sites
 
Mitty38

Mitty38

Well-Known Member
Ben using Winchester #6 small rifle primers for the .223. They look like they take a good hit every once and a while even with a mellow charge. And I have got a double fire, or slam fire once, but the firing pin was really gunked up so can not blame it on the primer.
Have a box of 41's just never got around to trying them yet.
Bought them because someone told me they fit tighter when the primer pockets start to loosen up.,and they will get you a couple more uses out of your brass. Plus the coupon rebate brought me to around $29 total for the 1000.
Maybe I need to open them up.
 
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Tomme boy

Tomme boy

Well-Known Member
Going to have to back off a bit. The load is at 59K with the 24gr load. I might have to get some 1680 to try. Lots of the jacketed bullet guys are using it. I also have some RL7. I tried it a while ago and was able to get some OK groups with it. Maybe it will like the RCBS over the Lee 200?

First is to back off the load and test smaller increases. I hate using this powder because of the cost of it. I have 4 lbs left and I really don't want to replace it.
 
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