WHAT PRIMER TO USE

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Re: WHAT PRIMER TO USE

Postby gmstack » Mon Jul 02, 2018 5:37 am

Hoot, I am 75 yrs old so I can identify with your last posting. guy
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Re: WHAT PRIMER TO USE

Postby CJP1 » Mon Jul 02, 2018 4:46 pm

Well I was going to use Rem 7-1/2 primers but the place I bought them from doesn't carry them any more. I'm thinking of going with the CCI 450 primers. Hoot, Sorry to hear of bad outing to the range with the 275 XPB bullets. I was looking forward to you helping me come up with a starting load for my RAR.
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Re: WHAT PRIMER TO USE

Postby Hoot » Mon Jul 02, 2018 8:17 pm

CJP1 wrote:Well I was going to use Rem 7-1/2 primers but the place I bought them from doesn't carry them any more. I'm thinking of going with the CCI 450 primers. Hoot, Sorry to hear of bad outing to the range with the 275 XPB bullets. I was looking forward to you helping me come up with a starting load for my RAR.


I'd venture that with the RAR's faster twist, the 275s might actually stabilize better. Start with 38gr of W296/H110 and work up in half grain steps. I had to vibrate the cases to get the powder to pack down far enough to seat to 2.22 with 42gr charge. If you load yours longer, you may be able to start at 39gr.

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Re: WHAT PRIMER TO USE

Postby Hoot » Mon Jul 02, 2018 8:33 pm

The first time I tested the 275's, I used the old blend of Lil Gun. It worked great. It wouldn't be the first time I changed to W296 to achieve the same velocity but had the groups open up. Lil Gun, even the current blend, still has the Ju-Ju. If I weren't out of 275's now, I'd give them a second chance going back to Lil Gun. Wish I had jumped on that deal for those tarnished ones but as I said, whitetails are not that hard to kill and we don't have hogs up here yet.

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Re: WHAT PRIMER TO USE

Postby gmstack » Tue Jul 03, 2018 8:40 am

Hoot , I picked up a box of rem 7 1/2 yesterday . thanks for your input. guy
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Re: WHAT PRIMER TO USE

Postby pitted bore » Fri Jul 06, 2018 1:17 pm

Hoot wrote: ...and its not like we can test them in the 450b, even if we wanted to. Velocities are so erratic, by bottleneck caliber standards, that the impact of the primer variations would be lost in the "background noise". If there's any chance of comparing the results in this caliber, it would no doubt come from a cannelured or grooved bullet with a well regulated stab crimp, shot from a bolt action. (Yo Bob...) ...


Hoot-
Using my bolt rifles in 450B, I have not been able to reduce the variability in MV that most shooters experience using AR-based rifles. It appears to be a characteristic of the cartridge. Because bolt rifles chambered in 450B have become relatively common, I have been hoping somebody would come up an answer, but I've read of none. Please clue me in if I've overlooked some data set.

I need to find out whether other straight-wall cartridges, e.g. 45-70, 44 Mag, 458 Win Mag, experience the same variability. If not, why not.

An excellent treatise on primer selection and the results of using different primers is Chapter 3, "Rifle Primers", of John Barsness' book The Big Book of Gun Gack - The Hunter's Guide to Handloading Smokeless Rifle Cartridges. (Book is available from riflesandrecipes.com.) Spoiler alert for the chapter: It depends. It's not even necessarily true that the primers displaying the most spectacular ignition in photos are the "hotter" or most capable of igniting hard-to-ignite powders or long powder columns. Photos don't show flame temperatures.

As I recall, Hornady selected the small rifle size for the 450B because they were concerned with the possibility that large primers could loosen the bullets in the case mouth before the powder started burning well. If this is so, then the cartridge design suggests that proper ignition is a fairly narrow range between too much primer "strength" and too little.

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