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300 MP 357 mag loads

This is a discussion on 300 MP 357 mag loads within the Reloading forums, part of the Firearm Forum category; 15 posts and nothing on group size. It is quite obvious that several of you are experienced handloaders. I chrono all my loads and use ...


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Old October 18th, 2019, 04:39 PM   #16
 
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15 posts and nothing on group size.

It is quite obvious that several of you are experienced handloaders.

I chrono all my loads and use the same .2 gr increases in powder and record the same data as you guys. The difference is I shoot for groups on every shot. My goal is accuracy and I get velocity as verify data. I take velocity to the reloading manuals and get an estimated pressure.

Is velocity the altar you prey at?? Why?

Seeking guidance,
Prescut



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Old October 19th, 2019, 04:20 AM   #17
 
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Quote:
Originally Posted by Prescut View Post
15 posts and nothing on group size.

It is quite obvious that several of you are experienced handloaders.

I chrono all my loads and use the same .2 gr increases in powder and record the same data as you guys. The difference is I shoot for groups on every shot. My goal is accuracy and I get velocity as verify data. I take velocity to the reloading manuals and get an estimated pressure.

Is velocity the altar you prey at?? Why?

Seeking guidance,
Prescut
Whoa Nelly!! Maybe some people are really busy. I am hunting now so range is down till after the first of January then I will have some good data and targets to post so in the meantime patience and someone else will have something. Accuracy is the key to for me and hopefully find a load thats good. I did shoot my newly acquired Rossi yesterday before I went hunting. My standard 158gr LSWC with 2400 @50 yd standing was really nicearound 3" cluster after adjusting sight. I have a long wait to bench twst it for real accuracy but again will have time to gather up some loads to give a good workout with my Rossi 92. I am betting the 2400 and H110 is going to be the most accurate of any powder as usual but other powder do have my attention.
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Old October 19th, 2019, 05:03 PM   #18
 
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Originally Posted by Phish View Post
Whoa Nelly!! Maybe some people are really busy. I am hunting now so range is down till after the first of January then I will have some good data and targets to post so in the meantime patience and someone else will have something. Accuracy is the key to for me and hopefully find a load thats good. I did shoot my newly acquired Rossi yesterday before I went hunting. My standard 158gr LSWC with 2400 @50 yd standing was really nicearound 3" cluster after adjusting sight. I have a long wait to bench twst it for real accuracy but again will have time to gather up some loads to give a good workout with my Rossi 92. I am betting the 2400 and H110 is going to be the most accurate of any powder as usual but other powder do have my attention.
Thanks Partner,
Right on target. That answers my question.

and that 3" cluster at 50 yards off hand is a sweet number; nice shooting.
Standing is a different world than my bench resting.

I don't want the other side of your powder bet. I've used 2400 and H110 successfully with lots of different bullets myself. They are excellent in this caliber for reaching higher velocities with accuracy.
Lately I've really liked the Vihtavuori powders; especially the N340. It's a touch faster than the H110 and doesn't get the velocity; but, the accuracy, cleanliness, and consistency has amazed me. Half again more money(it's from Finland), but powder price is the least of my expenses with shooting.

thanks,
Appreciate your response,
Prescut
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Old October 20th, 2019, 07:05 AM   #19
 
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Group size is 1.5 inches at 25 yards, 3.5 inches at 50. I sight in at 25.

As far as which powder does what, remember you really can't compare a LSWC to a jacketed sp or hp that has a thick jacket unlike the GD's. Most reloading info I have seen shows 2400 or power pistol falling short of the velocities I am getting from the 6" barrel and a whole lot less from a carbine. If I shot the same weight LSWC instead of the XTP I am sure my velocities would be much higher. I did check what 18 grains give me, right at 1400 fps and still no pressure signs. I do not know of any other powder that can achieve this, stay in the pressure safety zone and not be harmful to the revolver. If you push H110 hard to reach this, you will likely be a good deal over pressure, same goes for 2400. Lil gun burns hot, the biggest reason I chose not to use it.

The whole point of doing this and finding what I've found was to create a hunting load that delivers max energy on target accurately. It appears I have achieved it. As always your mileage may vary and everyone has their opinion. I've tried to give as much test data in real time as I could.

For hunting deer and similar weight animals , energy on target is just as important as accuracy, you really need both since 357 is the lower limit on medium game revolver calibers. Where I hunt, if you shoot a deer and it runs a mile, you will lose that deer with all the cover it can hide it.
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