IMR 4350 problems

[corbin9191]

I have been trying to use IMR 4350 in my 300 win mag and each time I go and shoot the pressure signs are really wierd. I have worked up from the minimum load to the maximum load and the primers are staying the same. the primers are still a little rounded at the edges on top and there is a buldge where the firing pin hit. It does it with every single load I use. Does anyone know what is going on? thanks

 

[YoteSmoker]

Most likely it is safe and just the indentation mark from the firing pin. Could also be a combo of soft primers. What are you using? As long as you're not getting bulges in the webbing, no split necks, and the primers aren't pierced or pushed back from the flash hole, you should be ok. I would recommend H4831SC and RL-22 to try with the 300 WM, if you are not happy with speeds and accuracy.

 

[Ol` Joe]

Does it do this with other powders or just IMR4350??
What velocities are you getting?
Is extraction normal?
Are primer pockets tight and staying that way for multiple loadings? (4-5+)

I suspect the fireing pin hole is a tad large and the primer is flowing a little back into it. That is nothing to really worrry about if true.

 

[corbin9191]

Most likely it is safe and just the indentation mark from the firing pin. Could also be a combo of soft primers. What are you using? As long as you're not getting bulges in the webbing, no split necks, and the primers aren't pierced or pushed back from the flash hole, you should be ok. I would recommend H4831SC and RL-22 to try with the 300 WM, if you are not happy with speeds and accuracy.

The primers I am using right now are CCI 250 large rifle magnum primers.

 

[corbin9191]

Does it do this with other powders or just IMR4350??
What velocities are you getting?
Is extraction normal?
Are primer pockets tight and staying that way for multiple loadings? (4-5+)

I suspect the fireing pin hole is a tad large and the primer is flowing a little back into it. That is nothing to really worrry about if true.

It only does this with IMR 4350 but the cases stick with RL-22. the velocity I am getting right now is about 3335 fps, and when I go to extract the shell it sticks a little bit, and the primers are staying tight. would IMR 7828 be ok to use because the velocity is great and the primers are becoming flat just like they should with no ejection problems.

 

[rick smith]

What bullet and load?Rick.

 

[nodak7mm]

First thought is 3335 FPS is a pretty warm load for a winnie, unless your shooting little bullets. A quick check of the Nosler online info, shows a max load using a 125 B/Tip is 3350 with 4350. Subsequently if your using RL-22, the info shows a max of 3290 using a 165 B/Tip. This would explain the case stickiness.

Your primers could be:

Soft cup, but you'd think they would flatten also.
Hi PSI's, again, you think you'd see flattening.
Oversize firing pin hole & weak spring.

I once had a Contender that had a horribly oversize firing pin hole and did that very same thing, confused me then I figured it out. Lived with for awhile till I started piercing the primers on a warmer day with proven mid range load.. I looked at bushing the firing pin hole and new spring, but traded it off instead.

Regardless, give us more infor on components used and I am sure more will chime in with advice...

Nodak

Good luck

 

[Antelope_Sniper]

What make is your rifle. My winchesters do this often.

If you are using an older book, some of the loads quoted for 4350 were a little spicy. You may wish to compare your load with the newest information avaliable.

 

[corbin9191]

What bullet and load?Rick.

The bullet I am using is hornady interlock 150 grain. the load is 76 grains of IMR 4350 with remington brass and CCI 250 large rifle magnum primers.

 

[corbin9191]

First thought is 3335 FPS is a pretty warm load for a winnie, unless your shooting little bullets. A quick check of the Nosler online info, shows a max load using a 125 B/Tip is 3350 with 4350. Subsequently if your using RL-22, the info shows a max of 3290 using a 165 B/Tip. This would explain the case stickiness.

Your primers could be:

Soft cup, but you'd think they would flatten also.
Hi PSI's, again, you think you'd see flattening.
Oversize firing pin hole & weak spring.

I once had a Contender that had a horribly oversize firing pin hole and did that very same thing, confused me then I figured it out. Lived with for awhile till I started piercing the primers on a warmer day with proven mid range load.. I looked at bushing the firing pin hole and new spring, but traded it off instead.

Regardless, give us more infor on components used and I am sure more will chime in with advice...

Nodak

Good luck

The powder is IMR 4350, The primers are CCI 250 large rifle magnum, the brass is remington, and the bullets are 150 grain hornady interlock with the btsp.

 

[corbin9191]

What make is your rifle. My winchesters do this often.

If you are using an older book, some of the loads quoted for 4350 were a little spicy. You may wish to compare your load with the newest information avaliable.

The make of my rifle is remington, and the reloading book that I am using is the lee reloading manual 2nd edition.

 

[Ol` Joe]

Hornadies new manual stops at 72 gr of IMR4350 with their 150 gr bullet. Nosler and Speers newest books show 74 and 73 gr max for the 150 gr bullet respectivly.

Personally I`d back off. The signs are all there the 76 gr load is too much.

 

[JD338]

Hornadies new manual stops at 72 gr of IMR4350 with their 150 gr bullet. Nosler and Speers newest books show 74 and 73 gr max for the 150 gr bullet respectivly.

Personally I`d back off. The signs are all there the 76 gr load is too much.

++1

JD338

 

[jtoews80]

I've found Lee's first edition to be pretty hot. NO idea what the second edition looks like tho. NOt really a bad thing, but good to know when working up loads. Start at the start load or a little less and watch for pressure!!! Better yet, consult the bullet maker's data!! Just MY opinion

CC.