Magnum Primers Best With H414/W760?

[Bangs OH]

Read that from a magazine column and wondered if it's so, or an old reloader's tale.
I recently tried some 760 with 60 gr. V-Max bullets and std. LR primers (.22-250), which didn't result in any great groups.
Wondering if a switch to magnums would be worth a try, and if any powder charge adjustment would be needed?

 

[JLT]

What was your powder charge? Ball powders perform best in a comparatively narrow pressure band, typically close to maximum average pressure. If your load is below that band by quite a bit, primers won't make much of a difference. FWIW, I've always used a large rifle magnum primer with H414.

 

[243winxb]

http://www.shootingtimes.com/ammo/ammunition_st_mamotaip_200909/

We tested loads at both maximum normal pressures and at the starting loads (some labs calculate start loads—we shot them). Standard primers caused no ignition issues at the max load but posted higher extreme variations in pressure and velocity in the lower pressure regimes of the start loads. In extreme cases, the start loads produced short delayed firings—probably in the range of 20 to 40 milliseconds but detectible to an experienced ballistician. Switching that propellant to a Magnum primer smoothed out the performance across the useful range of charge weights and completely eliminated the delays.

Read more: http://www.shootingtimes.com/ammo/ammunition_st_mamotaip_200909/#ixzz4s2fkHgDN

 

[Bangs OH]

Thanks for info!

 

[357Mag]

Bangs -

Howdy !

For my loads in my guns ( .22-250s and a .22-35 Remington wildcat ) the FED Magnum Rifle Match
primer worked best w/ WW760/H414, and bullet wt of 55-60gr. That was also true for my .22-35 loads shooting VV160 under Hornady prototype 55 "V"-Max.


With regards,
357Mag

 

[Preacher]

My 250 Ackley runs really nice with H-414 and the F215 primers.....
Not so nice with F-210's.....

 

[Zero333]

I tested W-748 in 308win with BR-2 and WinLR primers and BR2's could barely hold 1 moa while WinLR primers were shooting 1/2 moa with the same load.

This little test indicated to me that ball powders prefer hotter primers, since Winchester Large Rifle primers are said to be one of the hotter LR (non-magnum) primers... at least from what I read.

 

[louielouie]

I came across this web-page a few years ago and it was interesting about the way the primers were tested. Primer compounds and cup thicknes (for large primers anyway) change w/o much notification but the comments at the bottom are a reminder that your equipment needs to be optimal like firing pin being in good shape and proper protrusion, etc.
For those of you with sensitive scales, weighing your primers may be another OCD issue...
http://www.castingstuff.com/primer_testing_reference.htm